Tronair 112850S0000 Installation and operating instructions

OPERATION & SERVICE MANUAL
Tronair, Inc. Phone: [phone] | 800-426-6301
1 Air Cargo Pkwy East Web: www.tronair.com
Swanton, OH 43558 Email: [email protected]
28.5 VDC Ground Power Unit
Models:
112850S0000 112850S0100 112850S0200 112850D0200
112850D0000 112850D0100 112850D0100AV 112850D0100-A5
112860S0000 112860S0100 112860S0200 112860S0200
112860S0100-A4 112860S0100-A6
112860D0000 112860D0100 112860D0200
112860D0100-A5 112860D0200-A5
06/2013 - Rev. 03

REVISION DATE TEXT AFFECTED
01 01/2009 Original Release
02 03/2009
03 06/2013 Modified 5.2.3 Converter Commissioning and 5.3 Switching On

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03
TABLE OF CONTENTS PAGE
1.0 INTRODUCTION ...........................................................................................................................................................1
1.1 MODEL DISCTIPTIONS ............................................................................................................................................1
1.2 SAFETY NOTES........................................................................................................................................................2
2.0 TECHNICAL DATA .......................................................................................................................................................3
3.0 SYSTEM DESCRIPTION...............................................................................................................................................4
3.1 INTRODUCTION........................................................................................................................................................4
3.2 DETAILED DESCRIPTION ........................................................................................................................................4
3.3 PERFORMANCE UNDER UNUSUAL CONDITIONS................................................................................................4
3.4 SYSTEM CONTROL..................................................................................................................................................5
3.5 SAFETY AND PROTECTION ....................................................................................................................................5
3.6 CONTROL AND MONITORING.................................................................................................................................5
3.6.1 Power Supplies for Controls & Monitoring..................................................................................................................5
3.6.2 Internal System Control..............................................................................................................................................5
3.6.3 Converter Operation...................................................................................................................................................5
3.7 VOLTAGE REGULATION MODE ..............................................................................................................................5
3.7.1 General ......................................................................................................................................................................5
3.8 CONTROL PANEL.....................................................................................................................................................6
3.8.1 Operator Controls.......................................................................................................................................................6
3.8.2 Emergency Stop.........................................................................................................................................................6
3.9 OVERVIEW OF 28V DC GPU COMPONENTS.........................................................................................................6
4.0 INSTALLATION AND CONNECTIONS.........................................................................................................................7
4.1 GOODS INSPECTION...............................................................................................................................................7
4.2 HANDLING.................................................................................................................................................................7
4.3 PROTECTION............................................................................................................................................................7
4.4 STORAGE..................................................................................................................................................................7
4.4.1 Floor Loading Capacity ..............................................................................................................................................7
4.4.2 Space Requirements/Dimensions..............................................................................................................................8
4.4.3 Altitude, Temperature & Humidity ..............................................................................................................................8
4.5 ELECTRICAL CONNECTIONS (POWER).................................................................................................................8
4.5.1 Cable Entry ................................................................................................................................................................8
4.5.2 Cable Sizing...............................................................................................................................................................9
4.5.3 Mains Fuses...............................................................................................................................................................9
4.5.4 Connections...............................................................................................................................................................9
5.0 OPERATING INSTRUCTIONS....................................................................................................................................10
5.1 GENERAL................................................................................................................................................................10
5.1.1 Control Panel ...........................................................................................................................................................10
5.1.2 Operator Controls.....................................................................................................................................................10
5.2 COMMISSIONING ...................................................................................................................................................10
5.2.1 Tools Needed...........................................................................................................................................................10
5.2.2 Settings....................................................................................................................................................................11
5.2.3 Converter Commissioning........................................................................................................................................11
5.3 SWITCHING ON ......................................................................................................................................................13
5.4 EMERGENCY STOP ...............................................................................................................................................13
5.5 OUTPUT VOLTAGE DC ADJUSTMENT .................................................................................................................14
6.0 TROUBLE SHOOTING................................................................................................................................................14
6.1 GENERAL................................................................................................................................................................14
6.2 PROCEDURES IN THE EVENT OF MALFUNCTIONS...........................................................................................15
6.3 MONITORS & FAULT INDICATION.........................................................................................................................16
7.0 MAINTENANCE AND SERVICE.................................................................................................................................16
7.1 PREVENTIVE MAINTENANCE ...............................................................................................................................16
7.1.1 General ....................................................................................................................................................................16
7.1.2 Cleanliness...............................................................................................................................................................16
7.1.3 Voltage Check..........................................................................................................................................................16
7.2 SERVICE .................................................................................................................................................................16
8.0 ADDITIONAL INFORMATION.....................................................................................................................................17
8.1 LED FUNCTIONS & ARRANGEMENTS..................................................................................................................17
9.0 GUARANTEES/LIMITATION OF LIABILITY ..............................................................................................................17

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 1
This product can not be modified without the written approval of Tronair, Inc. Any modifications done without written approval
voids all warranties and releases Tronair, Inc., its suppliers, distributors, employees, or financial institutions from any liability
from consequences that may occur. Only Tronair OEM replacement parts shall be used.
1.0 INTRODUCTION
Many systems and devices in the aerospace industry,
and other fields, require a DC voltage of 28 volts. As
this cannot be supplied by the utility directly, converters
are employed which supply the necessary voltage and
eliminate supply irregularities to a limited extent.
Normally these units are used to supply smaller aircraft
with electric power. There are special reasons why
aircraft need a 28V DC voltage for internal supply. To
save costs in maintenance and operation, and also for
environmental reasons, aircraft are supplied by
external electrical power supplies when they are
parked at airport terminal stands with their engines
shut down.
This manual describes the Tronair 28V Ground Power Unit (GPU). If you follow these instructions you will be able to handle
the equipment with confidence and utilize all its facilities.
NOTE 1. Naturally an operating manual cannot cover every conceivable installation, operating, maintenance or servicing
situation. Should problems arise, or if the data in this manual is not sufficiently detailed, please contact your local
Tronair representative who will be pleased to give further assistance.
2. If the equipment is installed for use as an aircraft ground power system, please pay particular attention to Section
10, which summarizes the special features of this type of application.
1.1 MODEL DISCTIPTIONS
Model Number
Output
Cable
Input
Frequency
Input
Voltage
Input
Cable
ft (m)
Remarks
112850D0000
Dual
50(HZ)
200-415
NA
No input cable
One 20ft 4/0(AWG) & one 50ft 2/0(AWG) non-engine starting DC output cable
112850D0100
Dual
50(HZ)
200-415
50 (15.2)
50ft input cable
One 20ft 4/0(AWG) & one 50ft 2/0(AWG) non-engine starting DC output cable
112850D0100AV
Dual
50(HZ)
200-415
50 (15.2)
50ft input cable with external adjustable voltage
One 20ft 4/0(AWG) & one 50ft 2/0(AWG) non-engine starting DC output cable
112850D0100-A5
Dual
50(HZ)
208-480
50 (15.2)
50ft input cable, two 50ft 4/0(AWG) DC output cables
112850D0200
Dual
50(HZ)
200-415
100 (30.5)
100ft input cable with one 20ft 4/0(AWG)
One 50ft 2/0(AWG) non-engine starting DC output cable
112850S0000
Single
50(HZ)
200-415
NA
No input cable, one 20ft 4/0(AWG) DC output cable
112850S0100
Single
50(HZ)
200-415
50 (15.2)
50ft input cable, one 20ft 4/0(AWG) DC output cable
112850S0200
Single
50(HZ)
200-415
100 (30.5)
100ft input cable, one 20ft 4/0(AWG) DC output cable
112860D0000
Dual
60(HZ)
208-480
NA
No input cable
One 20ft 4/0(AWG) & one 50ft 2/0(AWG) non-engine starting DC output cable
112860D0100
Dual
60(HZ)
208-480
50 (15.2)
50ft input cable
One 20ft 4/0(AWG) & one 50ft 2/0(AWG) non-engine starting DC output cable
112860D0100-A5
Dual
60(HZ)
208-480
50 (15.2)
50ft input cable, two 50ft 4/0(AWG) DC output cables
112860D0200
Dual
60(HZ)
208-480
100 (30.5)
100ft input cable
One 20ft 4/0(AWG) & one 50ft 2/0(AWG) non-engine starting DC output cable
112860D0200-A5
Dual
60(HZ)
208-480
100 (30.5)
100ft input cable
Two 50ft 4/0(AWG) DC output cables
112860S0000
Single
60(HZ)
208-480
NA
No input cable, one 20ft 4/0(AWG) DC output cable
112860S0100
Single
60(HZ)
208-480
50 (15.2)
50ft input cable, one 20ft 4/0(AWG) DC output cable
112860S0100-A4
Single
60(HZ)
208-480
50 (15.2)
50ft input cable with Crouse-Hinds plug installed
One 20ft 4/0(AWG) DC output cable
112860S0100-A6
Single
60(HZ)
208-480
50 (15.2)
50ft input cable, one 20ft 4/0(AWG) DC output cable, AP20468 plug
112860S0200
Single
60(HZ)
208-480
100 (30.5)
100ft input cable, one 20ft 4/0(AWG) DC output cable
112860S0200SP
Single
60(HZ)
208-480
100 (30.5)
100ft input cable, one 20ft 4/0(AWG) DC output cable, special paint color

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 2
1.2 SAFETY NOTES
The 28V DC GPU is a piece of electrical equipment which carries voltages and currents that are hazardous to personnel. The
following advice must therefore be observed at all times:
Installation, operation and maintenance of this equipment must be carried out according to the instructions in this manual.
Ensure that the equipment is handled only by well-trained and authorized personnel.
Take suitable measures to ensure that only trained operating and maintenance personnel have access to the interior of
the system; the doors should be kept locked and the keys retained by authorized persons.
System installation, service and maintenance must be performed by trained staff.
The relevant regulations of the local codes and standards, and other safety instructions should be observed.
All personnel who have to work on the equipment should be familiar with first-aid procedures relating to electrical
accidents.
Even when the equipment is switched off, a few internal parts remain “live” while they are connected to the incoming
supply.
Work on the equipment must only take place with the unit switched off and isolated. Proper Lockout/Tagout procedures
must be followed at all times.
Built-in capacitors can remain charged, even when the complete system is “de-energized”. They should be suitably
discharged by trained personnel before contact is made with the connections.
Fuses must not be rewired or shorted out and rewired fuses must not be used. When replacing fuses, only the same or
lower current ratings and the same types (slow-blow, quick-acting, very quick-acting) should be used.
The system environment should be kept as clean as possible and metallic or other electrically-conducting dust particles in
particular must be prevented from being sucked in through the air inlet.
The warning and hazard notices inside the equipment must be observed.
Explanation of the warning symbols used in these operating instructions are as follows:
WARNING Appears alongside all instructions which must be followed exactly in order to eliminate personal injury
and corruption/destruction of data
IMPORTANT Appears alongside all instructions which must be followed in order to eliminate damage to equipment and/or
malfunctions
NOTE Indicates important information or advice, which must be followed during installation, operation, service or
maintenance.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 3
2.0 TECHNICAL DATA
Length: 42 in (107 cm)
Width 31 in (79 cm) Single
33 in (84 cm) Dual
Height 33 in (84 cm)
Type
28V DC GPU 600A
Input Data
Input power
25 kVA
Nominal voltage 3ph
208V/60 Hz, 400V/50 Hz, 480V/60Hz ±10%
Nominal frequency
50 Hz or 60 Hz ±5%
Nominal input current at
208V 60Hz
400V 50Hz
480V 60Hz
575V 60Hz
56 A
29 A
24 A
21A
Output Data
Output power
16.8 kW
Nominal voltage
28V
Nominal current
600 A
Voltage adjustment range
Nominal 20 –31V (other values on request)
DC ripple voltage (without filter)
< 1V
DC ripple voltage (with filter)
< 786 mv
Voltage characteristics:
–static
±1%
–dynamic (100% load step)
MIL-Std. 704, Fig. 5
Recovery time
< 200 ms
Output frequency
DC
Overload capability
Max 2000A for up to 2sec
Option
General Data
Total efficiency
> 90%
Maximum losses
4 kW
Audible noise
< 70 dB(A)
Temperature range
-4 +104F (–20 - +40°C)
Humidity
max. 95%
Paint finish
RAL 7032
Protection type
IP54/Nema 3R

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 4
3.0 SYSTEM DESCRIPTION
3.1 INTRODUCTION
The 28V GPU is manufactured using the latest state-of-the-art technology. The design concept and the selected components
utilize the latest trends in power electronics, and represents the best solution for the different problems of Ground Power
Supplies. The 28V GPU is built with output voltage regulation and load current limiting. The following block diagram shows the
principle. WARNING!
Even when the 28V GPU is switched off, a few internal parts still remain “live”.
The transformer converts the mains supply to a voltage suitable for supplying the load via the rectifier. The transformer is a
two winding transformer which provides galvanic isolation between the mains and the load. The rectification is achieved by
using a 6-pulse SCR. The output filter network limits the ripple at the output voltage to a low level.
An integrated control panel with push buttons and an LED’s operate the unit is located on the front door of the unit.
3.2 DETAILED DESCRIPTION
An integrated interface board contains a micro controller to control and monitor all functions of the system. Depending on the
measurement values, the input voltage of the transformer is regulated in order to obtain the correct output voltage. All
functions are digitally controlled.
The following functions are built in:
Measurement and evaluation
Output voltage regulation and current limiting
System control (PLC function)
Measurement values from the input are collected via the interface board, and from the output direct to the controller board,
where they are evaluated and monitored.
Normally the overload and short circuit protection is provided by the interface board. Protection, by the input circuit breaker
CB1, takes place in case of malfunctions of the electronics.
The measurement values are also used for voltage regulation. The output voltage regulation consists of a voltage regulator
plus a current regulator, which is the main regulator. This means if a current limit has been set in the setup menu, this current
regulator will limit the output voltage to a value at which the set current is reached. If the current is less than the set maximum,
the voltage regulator will limit the output voltage to obtain the set value. In this case, the current regulator is turned off. The
output of these regulators is converted to a pulse pattern, which is transmitted to the firing board to fire the SCR modules.
The complete unit is operated via the system control. This works similar to a standard PLC. This means that particular input
events will generate particular output events.
There is a Control Panel on the front of the cabinet which contains the main disconnect switch with LED (light emitting diodes)
indications and on/off buttons. The Control Panel gives the user a comprehensive status indication of the unit. The LED’s on
the control panel show the status of each logical section of the unit, displaying green, yellow or red, and flashing or steady
state to show various normal, available, warning and abnormal states of the unit. The push buttons allow the user to switch the
DC output on and off and adjust unit settings. Output voltage and current are displayed on the control panel.
3.3 PERFORMANCE UNDER UNUSUAL CONDITIONS
Overload - The converter can deliver up to a maximum of 2000 A for 3 sec. At higher overloads the output current is limited.
Short-circuit on the load busbar - In principle, a short-circuit occurring on the output side is handled similar to an overload,
except that the output voltage is very low. The output power will be limited as described above for an overload. The rectifier
itself has short-circuit protection.
Mains fault - If the mains supply is outside permissible tolerances, it is not possible to start the system. If the converter is
running and the mains supply goes out of the permissible tolerances, the converter will switch off within 50ms.
Output fault - The converter monitors the output voltage continuously. If it exceeds the permissible tolerances the unit is
switched off.
Over-temperature - In the event of a fan failure, the system continues to run normally until the over-temperature protection
cuts in.
3.0 System description continued on following page.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 5
3.0 SYSTEM DESCRIPTION (continued)
3.4 SYSTEM CONTROL
System control consists of one System Interface Board, a firing board, one Operator Panel.
The System Interface Board handles the master system control function. Control commands from the Control Panel CP are
transmitted to this controller, evaluated and converted into the appropriate actions. Current operating parameters (measured
values etc.) are also evaluated by the System Interface Board. The following measure values are not displayed, but are also
monitored for deviations from the specification:
Input under & over-voltage
Output under & over-voltage
Output overload
Over-temperature
3.5 SAFETY AND PROTECTION
The design philosophy for the 28V DC GPU is that it will endeavor to protect itself at all times. Self-protection is incorporated in
both the hardware and software designs. Where situations arise that could either cause damage to the converter, or endanger
the output load, the general rule is to disconnect and/or shutdown.
For safety of personnel, an Emergency Stop button is fitted local to the Control Panel on the front of the converter cubicle.
3.6 CONTROL AND MONITORING
3.6.1 Power Supplies for Controls & Monitoring
All the electronic cards within the converter receive their power via transformers.
3.6.2 Internal System Control
System Interface Board has the function of complete system control.
Control Panel consists of control and display elements for the user. Commands are analyzed by the system controller and
interpreted into actions. Measurement values for the input and output circuits are processed and displayed.
3.6.3 Converter Operation
As soon as mains incoming power is applied to the control logic the microprocessors commence operating and the internal
function becomes active. Initially their only function is a ‘watchdog operation’ checking for faults within the converter and
monitoring the incoming supply for voltage and frequency deviations. Any faults or deviations detected are reported internally
at the System Interface Board.
3.7 VOLTAGE REGULATION MODE
3.7.1 General
The unit supplies a load which requires a supply voltage with very little deviation. (Normally 28V DC +/- 1%). If a very long
cable is used between the converter and the aircraft (load), a voltage drop will be created which might be greater than the
acceptable voltage tolerance of the aircraft. If this happens, it is no longer possible for many units on the market to provide an
acceptable voltage supply to the aircraft especially under all load conditions.
To overcome this problem, two possibilities are available:
1. The cable between the converter and the load could be designed in such a way that the voltage drop will be decreased so
that the supply voltage is within tolerance range. The amount of copper wires and/or size can be increased or parallel cables
can be used. However there comes a point where the size of the copper wires required could become too heavy or costly, or if
the length of run is so long, that increasing the amount or wire size will still not be enough to keep the tolerance within the
voltage range, for all load conditions.
2. The converter must incorporate a LDC (Line Drop Compensation) system that can provide active compensation so as to
automatically compensate for the voltage drop.
With very long cable runs, parallel cables will increase the wire investment costs dramatically and if flexible aircraft cables are
also used, then parallel cabling might not be possible or practical.
To ensure that the proper voltage is delivered to the aircraft plug under all load conditions, there must be a means of
measuring the voltage at the aircraft plug, and sending those voltage signals back to the converter, so they can be analyzed
and responded to. This requires that signal wires be run between the plug and the converter unit, where again cost and
practicality must be considered.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 6
3.0 SYSTEM DESCRIPTION (continued)
3.8 CONTROL PANEL
There is a local Control Panel on the cubicle door of the converter which contains a light emitting diode (LED) indications, E-
Stop, and meters
The LED’s on the control panel are red, green and yellow. They are also bi-functional, able to display as steady state or
flashing. With combinations it is possible to display healthy state, non-operational, abnormal and fault conditions.
Green steady state..........................Running or switched on
Yellow flashing ................................Warning
Red flashing....................................Hardware fault (circuit breaker, contactor, etc.)
Red steady state.............................Abnormal condition (e.g. mains fault, overload, etc)
The Red indicating LED is for fault conditions that are recoverable, such as overload. These faults are displayed as a Steady
Red light. Faults requiring maintenance attention, such as CB open, are displayed as a Flashing Red light.
3.8.1 Operator Controls
Push buttons “ON” and “OFF” control the converter operations.
3.8.2 Emergency Stop
In an emergency, to immediately open the unit’s input and output contactors, the large red button on the Control Panel must
be pressed.
IMPORTANT Bear in mind, however, that the mains in feed is still “live”. The converter can only be isolated by using suitable
external means such as padlocking the supply breakers of the incoming distribution board.
3.9 OVERVIEW OF 28V DC GPU COMPONENTS
The modules and components of the individual sizes of the 28V DC GPU are shown in the outline drawings in this section. The
sizes and arrangement of the modules and components shown vary slightly according to the power rating and version of the
28V DC GPU sets.
Abbreviation
Description of Component
MOD 1
Rectifier SCR
PCB 2
Firing board
Interface board
K-1
28V Relay
K-2
28V Relay
T2
Power supply transformer
T2
Power supply transformer
T3
Power supply transformer
PAN 1
Control panel
CAPS
Filtering capacitors
FAN 1
Cooling Fan
R 1
Load resistor
CB 1
Input circuit breaker
CB 2-6
Protective circuit-breaker control voltage
SW 5
Current limit POT
T 1
Isolated 3 phase input transformer
AUX 1
Transformer auxiliary voltage
AUX 2
Transformer auxiliary voltage
CONT 1
DC output contactor
CONT 2
DC output contactor

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 7
4.0 INSTALLATION AND CONNECTIONS
4.1 GOODS INSPECTION
Before leaving the factory, the correct mechanical and electrical state of
the 28V DC GPU is checked in a final inspection. As soon as the
equipment has arrived check whether any freight damage has occurred
and if necessary, bring this to the attention of the freight operator. In no
circumstances put a damaged converter into service without consulting
your Tronair representative first.
4.2 HANDLING
The converter can be rolled into place or moved by means of a forklift or
pallet lift truck
IMPORTANT Moving by crane should only be used in exceptional
circumstances using load-spreading rails above the unit.
Please pay attention to the following handling advice:
Equipment should only be transported in an upright position
The equipment must not be tilted or turned over
Always avoid sharp impacts
Where possible, leave the equipment in its original packing when moving it, this provides the best possible protection
against damage
When moving the equipment on raised floors, it could be necessary to use a means of load distribution in order to avoid
damage to the floor
4.3 PROTECTION
During installation and cabling it is absolutely essential that the equipment is protected from the ingress of water, concrete or
metal particles, and dust etc. Protection of the equipment is particularly important when other trades or construction is taking
place in the same vicinity. All inlets and parts of the equipment not being worked on should be covered, at the least with
heavy-duty polyethylene, and preferably with more substantial packing.
It is also important to ensure that people working overhead do not stand on the equipment or use it as a convenient platform
for other work.
On completion of any work requiring the opening of the equipment doors or panels or removal of cover plates or gland plates,
the unit should be thoroughly vacuumed out and re-packed or protected. Tronair accepts no liability for any damage to
equipment caused by physical mal-treatment or by ingress of foreign material.
4.4 STORAGE
If it is necessary to store the converter for any length of time than it should be stored in a dry, well-ventilated room that is free
of corrosive materials. Where possible, the original packing should not be removed during storage.
IMPORTANT In no circumstances must the converter be stacked, or stored outside.
4.4.1 Floor Loading Capacity
The weight of the equipment is distributed over a relatively small area; special care must therefore be taken to ensure that the
floor loading capacity is adequate. The exact value can be obtained from the Technical Data. If necessary, the supporting
surface can be reinforced by interposing a suitable steel plate. Please consult your architect or Tronair representative if you
require assistance.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 8
4.4.2 Space Requirements/Dimensions
About 80 cm/32” clearance should be left in front of the unit to provide unimpeded access to the cubicle. Local or general
safety regulations, e.g. escape routes, should also be observed. In no circumstances must the air inlet (around the bottom of
the unit) and the air outlet (around the top of the unit) be covered or obstructed.
4.4.3 Altitude, Temperature & Humidity
The 28V DC GPU is designed for an installation altitude of up to 1000 meters above mean sea level, an ambient temperature
of -20 to 40 oC / -4 to +104 oF and a relative humidity of up to 95%. The optimum temperature is around 68 oF. Please ensure
that any existing air-conditioning plant meets these conditions and is also able to remove the unit's dissipated heat. Details are
shown in the Technical Data (Section 2). The cooling air must always be free of corrosive agents. You should consult your
Tronair representative if planning an installation above 1000 meters.
4.5 ELECTRICAL CONNECTIONS (POWER)
4.5.1 Cable Entry
The input and output cables are connected in the lower part of the cubicle. The cables can be brought up to the cubicle from
the rear (input cable) and the right (output cable) and led in through end panel of the cubicle. Please refer to table below for
the cable sizes, which must conform to local electrical code.
Cables must be properly gasketed with a screwed gasket fitted with a strain-relief device and sealing ring.
4.5 Electrical connections (power) continued on following page.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 9
4.5 ELECTRICAL CONNECTIONS (POWER) (continued)
4.5.2 Cable Sizing
Cables should be sized in accordance with the rating of the next protective device upstream, taking into account
temperature, voltage-drop and installation method factors, as per the appropriate standard for the site. In general, Tronair
recommends that the voltage-drop for both input and output power cables should not exceed 1.5%, and that the connecting
cables should be as short as possible especially the output cable (less than 10 m/30 feet is recommended). Tronair should be
consulted if these requirements cannot be met.
When specifying the cable lengths allow for about 0.5 m/20 in. inside the cubicle. The table on the following page shows the
recommended cable types:
Equipment Type
Line
Voltage
Rated
Amps
Input Cable (If Less Than 30´)/
Copper Size
Output Cable
28V DC GPU 600A
208
56
1 x NYY 4 x 10 RE/10 or #4
2 x NYY 120 or 2x 4/0 cables
230
51
1 x NYY 4 x 10 RE/10 or #4
400
29
1 x NYY 4 x 6 RE/6 or #8
480
24
1 x NYY 4 x 4 RE/4 or #8
575
20
1 x NYY 4 x 4 RE/4 or #8
4.5.3 Mains Fuses
To meet Health & Safety requirements, lockable isolating fused-switches must always be installed for the mains infeed. The
fuses should be of type GL. Likewise, it should be possible to isolate the converter output from downstream circuits by means
of an external lockable switch or circuit breaker. Please consult your Tronair representative regarding use of circuit breakers
for the mains infeed.
Equipment Type
Mains Isolator
CB
28V DC GPU 600A
100 A
25 A, 5A
4.5.4 Connections
Power:
3 phase Mains Supply + Neutral
2 wire 28V DC + and –
The terminal arrangement will depend on the size and configuration of the 28 VDC GPU. The following drawings show the
various configurations:
Terminal
No. of Terminal
Function
Short Name
L1
Mains Input
L1
L2
Mains Input
L2
L3
Mains Input
L3
N50/N60
Mains Neutral
N50
+
Load Output +
Load Output -

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 10
5.0 OPERATING INSTRUCTIONS
5.1 GENERAL
This chapter describes how the 28V DC GPU should be operated. After an introduction to the operator controls and indicators,
the steps for switching the system on and off are given. A smooth sequence of operations is only achieved if the individual
steps are carried out in the specific order.
5.1.1 Control Panel
The Control Panel on the cubicle door contains LED indicators, push buttons, main disconnect switch and E-stop switch.
Specific switching functions are initiated, operating information are displayed.
If an abnormal operating condition or fault occurs, the red “General failure” LED lights up. At the same time the LED’s on the
control panel show the current operating status and the fault is indicated on the panel.
5.1.2 Operator Controls
5.2 COMMISSIONING WARNING!
Before initial start-up, check the following:
1. Is the equipment damaged? If yes, do not put into service without consulting your Tronair
representative
2. Is the cabling properly installed? (Mains, output, remote control, etc.,?) Correct if necessary
5.2.1 Tools Needed
The following tools will be needed in order to put the 28 VDC GPU into operation:
Multimeter
Allen wrench
7/16 wrench
Various screwdrivers
5.2 Commissioning continued on following page.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 11
5.2 COMMISSIONING (continued)
5.2.2 Settings
The rectifier is available in 50 Hz and 60 Hz, both units are capable of being operated at various input voltages. The 50 Hz unit
can be operated with 200V, 380V or 415V and the 60Hz unit with 208V, 240V or 480V. Before the mains supply is switched
on, the unit type has to be adjusted correctly.
Setting the various transformer taps:
The unit is equipped with two control voltage transformers (T2 and T3) and one main transformer (T1). The wires have to be
connected to the correct tap in accordance with the mains input voltage at T1 transformer. T1 transformer has terminals for 3
different input voltages. Place the wire jumpers according to the drawings below.
VOLTAGE CHANGING INSTRUCTIONS –50 Hz
VOLTAGE CHANGING INSTRUCTIONS –60 Hz
5.2.3 Converter Commissioning WARNING!
A. Commissioning must be only carried out by trained personnel since work has to be done on
component that may be “live”!
B. Power up the device only when requested to do so in the following text.
ATTENTION:
I. Commissioning tasks should be carried out if:
the system is being put into service for the first time,
changes have been made, or
repairs were carried out
High Voltage: 480/240/208

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 12
5.2.3 Converter Commissioning (continued)
II. Carry out the individual steps in the correct sequence:
1. Check all T-1 transformer connections and tighten if necessary. Ensure voltage is tapped for (480, 240, 208VAC 60Hz or
415,380, 200 VAC 50Hz)
2. Ensure MAIN DISCONNECT SWITCH on the GPU is in the OFF position
3. Connect AC input power cable to the main power outlet and apply electrical power
4. Set current limiting switch on front panel to highest setting (2000 AMP)
5. Turn GPU main disconnect switch to ON
6. Ensure green main input power lamp is ON, DC voltmeter is indicating 28.5 volts, and no other fault lamps are on
NOTE: Ensure DC output power is not on and DC lamps are off.
7. For all models, connect a load bank to the DC OUTPUT CABLE 1, set load bank to 2000 Amps, and ensure load bank
switch is OFF
8. Connect a digital multi meter to the test points on the load bank
NOTE: The following test is for Single Output Cable units.
9. Push the WHITE DC ON switch. Observe GREEN DC ON lamp is ON
10. Ensure load bank is ON and cooling fans should begin spinning
11. Switch the load bank to 300 AMP; verify the voltage at the load bank is 28.0 (MIN) - 28.9 (MAX) Volts DC. Adjust R-67 on
Interface Board to obtain correct voltage output
12. Move load bank switch to AUTO; verify the voltage range at the load bank is 16.0 thru 28.9 volts DC and a minimum
1600 AMPS at full load
13. Observe Amber Warning lamp flashes if DC output volts drops below 21VDC. LET LOAD BANK COOL, push Black
DC Off switch
NOTE: The following test is for Dual Output Cable units.
14. Follow steps 1 thru 8
15. Push GREEN DC ENABLE ON switch; verify GREEN DC ENABLE lamp is ON
16. Push the WHITE DC 1 ON switch, observe GREEN DC 1 lamp is ON
17. Follow steps 10 thru 13
18. Connect a load bank to the DC OUTPUT CABLE 2
19. Push the WHITE DC 2 ON switch, observe GREEN DC 2lamp is ON
20. Repeat steps 13 and 17 using DC OUTPUT CABLE 2. Let load bank COOL, push Black DC 2 Off switch
21. Connect load banks to DC OUTPUT CABLES 1 and 2. (Set Load for 300 Amps Each)
22. Push the WHITE DC 1 & 2 ON switches, observe GREEN DC 1 & 2 lamps are ON
23. Observe voltage on digital multi meter, it should indicate 28(MIN) VDC with loads. Reduce loads to 0 Amps
24. Let load banks COOL, push Black DC 1 & 2 Off switches
25. Disconnect load banks
26. Turn disconnect on main power outlet to OFF
27. Final inspect the unit for missing, loose, components
28. When the unit passes all test, release unit for normal operation
NOTE: The following test is for External Voltage Adjustable units
29. Follow steps 1 thru 2
30. Open control panel door, locate the Interface Board, insure voltage adjust switch (SW1) is in the external (EXT) position
31. Insure over-volt trip switch (SW2) is in the low (LOW) position. Close control panel door
32. Connect AC input power cable to the main power outlet and apply electrical power
33. Set current limiting switch on front panel to highest setting (2000 AMP)
34. Turn GPU main disconnect switch to ON
35. Ensure green main power lamp is ON, DC voltmeter is indicating 28.5 volts and no other fault lamps are on
36. Connect a load bank switch to the DC OUTPUT CABLE 1, set load bank to 2000 Amps and ensure load bank switch is
OFF
37. Connect a digital multi meter to the test points on the load bank
38. Push GREEN DC ENABLE ON switch; verify GREEN DC ENABLE lamp is ON
39. Adjust voltage control knob on control panel to 28 VDC mark
40. Push WHITE DC 1 ON switch, observe GREEN DC 1 lamp is ON
41. Ensure load bank is ON and cooling fans should be spinning
42. Switch the load bank to 300 AMP; verify the voltage at the load bank is 28.0 (min) –28.9 (max) Volts DC. Adjust the
External Voltage control knob on the control panel to obtain correct voltage output
43. Move load bank switch to AUTO; verify the voltage range at the load bank is 16.0 thru 28.9 volts DC and a minimum 1600
Amps at full load
5.2.3 Converter commissioning continued on following page.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 13
5.2.3 Converter Commissioning (continued)
44. Observe amber warning lamp flashes if DC output volts drops below 21 VDC. LET LOAD BANK COOL, push black DC
OFF switch
45. Disconnect load bank
46. Turn disconnect on main power outlet to OFF
47. Final inspect the unit for missing or loose components
48. When the unit passes all tests release for normal operation
5.3 SWITCHING ON
NOTE: Before switching the set on for the first time after installation, check that the cabling has been correctly
installed.
1. Connect AC input power cable to the main power outlet and apply electrical power
2. Set current limiting switch on front panel to as needed
3. Turn GPU main disconnect switch to ON (RIGHT/HORIZONTAL)
4. Ensure green main input power lamp is ON, DC voltmeter is indicating 28.5 volts, and no other fault lamps are on
Note: Ensure DC output power is not on and DC lamps are off
5. For all models, connect the DC output cable (s) to the aircraft DC socket. Ensure cable plug is fully inserted into the
socket
6. Push the WHITE DC ON switch. Observe GREEN DC ON lamp is ON
7. The unit will operate normally
8. Push BLACK DC OFF switch to stop
9. Turn GPU main disconnect switch to OFF (LEFT/VERTICAL)
10. Disconnect DC cable from aircraft. Disconnect AC input power cable and stow cables on GPU
NOTE: The following steps are for Dual Output Cable units
WARNING!
Do not use DC Cable 2 for starting aircraft engines 300 amps maximum output.
11. Follow steps 1 thru 5
12. Push GREEN DC ENABLE ON switch; verify GREEN DC ENABLE lamp is ON
13. Push the WHITE DC 1 or 2 ON switches; observe GREEN DC 1 or 2 lamps are ON. (USE BOTH CABLES IF
NEEDED)
14. Push BLACK DC OFF switches to stop
15. Push RED DC ENABLE OFF switch
16. Turn GPU main disconnect switch to OFF (LEFT/VERTICAL)
17. Disconnect DC cable (s) from aircraft. Disconnect AC input power cable and stow cables on GPU
NOTE: The following test is for External Voltage Adjustable units
18. Follow steps 1 thru 4
19. Connect the DC output cable(s) to the aircraft DC socket. Ensure cable plug is fully inserted into the socket
20. Adjust voltage control knob on control panel to 28 VDC mark
21. Push the WHITE DC 1 ON switch, observe GREEN DC 1 lamps is ON
22. The unit will operate normally
23. Push BLACK DC OFF switch to stop
24. Turn GPU main disconnect switch to OFF (left/vertical)
25. Disconnect DC cable from aircraft. Disconnect AC input power cable and stow cables on GPU
WARNING!
Even when switched off, a few components inside the set remain “live“. Only trained personnel should be
allowed to work on set.
5.4 EMERGENCY STOP
In an emergency, to immediately shut off the system, the red Emergency Stop push button on the Control Panel must be
pressed. Bear in mind, however, that the mains in feed is still “live”. It can only be isolated by using suitable external means

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 14
5.0 OPERATING INSTRUCTIONS (CONTINUED)
5.5 OUTPUT VOLTAGE DC ADJUSTMENT WARNING!
Dangerous voltages in side control panel door!
This adjustment procedure shall be performed by qualified personnel!
1. Open control panel door.
2. Connect AC input power cable to the main power outlet and apply electrical power.
3. Turn GPU main disconnect switch to ON (RIGHT/HORIZONTAL)
4. Ensure green main input power lamp is ON, DC voltmeter is indicating 28.5 volts, and no other fault lamps are on.
NOTE: Ensure DC output power is not on and DC lamps are off.
5. For all models, connect a load bank to the DC OUTPUT CABLE 1, set load bank to 2000 Amps, and ensure load bank
switch is OFF.
6. Connect a digital multi meter to the test points on the load bank.
NOTE: The following test is for Single Output Cable units.
7. Push the WHITE DC ON switch. Observe GREEN DC ON lamp is ON.
8. Ensure load bank is ON and cooling fans should begin spinning.
9. Switch the load bank to 300 AMP; verify the voltage at the load bank is 28.0(MIN) - 28.9(MAX) Volts DC. Adjust R-67 on
Interface Board to obtain correct voltage output.
10. Move load bank switch to AUTO; verify the voltage range at the load bank is 16.0 thru 28.9 volts DC and a minimum
1600 AMPS at full load.
11. Observe Amber Warning lamp flashes if DC output volts drops below 21VDC. LET LOAD BANK COOL, push Black
DC Off switch.
12. Turn GPU main disconnect switch to OFF (LEFT/VERTICAL)
13. Disconnect DC cable from load bank. Disconnect AC input power cable and stow cables on GPU.
6.0 TROUBLE SHOOTING
6.1 GENERAL
NOTE In the event of a fault, the system fault messages should be evaluated using the chart below.
If the cause of the fault is within the converter and you cannot clear it with your own personnel, please contact your Tronair
Service representative:
TRONAIR, Inc. Telephone: [phone] or 800-426-6301
1740 Eber Road Fax: [phone]
Holland, Ohio 43528-9794 USA E-mail: [email protected]
Website: www.tronair.com
It is very helpful for fault diagnosis if you can tell us the fault messages in the order in which they occurred.
6.0 Trouble shooting continued on following page.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 15
6.0 TROUBLE SHOOTING (continued)
6.2 PROCEDURES IN THE EVENT OF MALFUNCTIONS
Follow the steps below in case of malfunctions:
Action Upon Fault Detection
Fault
Description
Condition
Fault Sense
Location
Input
Breaker
DC Output
Contactor
SCR Firing
Enable
(Green)
Input
Voltage
LED
Amber
Warning
LED
Red
Fault
LED
Output
Contact
or LED
Recovery
Notes
None
Normal
Firing Board to
Interface Board
ON
ON
Enabled
ON
OFF
OFF
ON
None
Missing
Phase
Any phase voltage
missing (>5% of
rated voltage)
Firing Board to
Interface Board
Opened
Immediately
Unit Power
Is Off
Unit Power Is
Off
Unit
Power
Is Off
Unit
Power Is
Off
Unit
Power
Is Off
Unit
Power
Is Off
Input Breaker
Must be Cycled
Input
Overvoltage
Secondary AC
Voltage >115% of
max voltage range
Interface Board
Opened
Immediately
Unit Power
Is Off
Unit Power Is
Off
Unit
Power
Is Off
Unit
Power Is
Off
Unit
Power
Is Off
Unit
Power
Is Off
Input Breaker
Must be Cycled
Input Under
Voltage
Primary AC
Voltage <85% of
rated voltage
Interface Board
ON
ON
ON
BLINK
ON
OFF
ON
Automatic when
condition
changes
If input voltage is
to low unit will
brown out
Output Over
Voltage
Output Voltage
>103% of Max of
32.5V at unit
output (> 33.5V)
Interface Board
ON
Opened
After
100ms
Disabled
Immediately
On
BLINK
BLINK
OFF
Input Breaker
Must be Cycled
Output
Under
Voltage
Output <97% of
Min of 24 V at unit
output (< 23.3V)
Interface Board
ON
ON
ON
ON
BLINK
OFF
ON
Automatic when
condition
changes
Output High
Over Current
Output Current >
2100A
Interface Board
ON
Opened
After
100ms
Disabled
Immediately
ON
ON
BLINK
OFF
Input Breaker
Must be Cycled
Transformer
Over-
Temperature
Any/All Core
Temperature
> 180°C
Transformer
Thermal
Switches to
Interface Board
ON
Opened
After
100ms
Disabled
Immediately
ON
ON
ON
OFF
Input Breaker
Must be Cycled
SCR Over-
Temperature
Any/All SCR
Temperature
> 82°C
SCR/Heatsink
Thermal
Switches to
Interface Board
ON
Opened
After
100ms
Disabled
Immediately
ON
OFF
BLINK
OFF
Input Breaker
Must be Cycled

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 16
6.0 TROUBLE SHOOTING (continued)
6.3 MONITORS & FAULT INDICATION
The following LEDs are used to define the color/flashing status of the GPU on the Control Panel:
Condition
(Green) Input
Power LED
(Amber)
Warning LED
(Red)
Fault LED
(Green) Output
Contactor LED
Normal Operation/Output Switch On
On
Off
Off
On
Power Off or Missing Phase or Input Overvoltage
Off
Off
Off
Off
Input Undervoltage
*Blink*
On
Off
On
Output Overvoltage
On
*Blink*
*Blink*
Off
Output Undervoltage
On
*Blink*
Off
On
Output High Overcurrent (>2100A)
On
On
*Blink*
Off
Transformer Overtemperature
On
On
On
Off
SCR Overtemperature
On
Off
*Blink*
Off
Normal Operation/Output Enable Switch Off
On
Off
Off
Off
Emergency Stop Switch Pushed In
Off
Off
Off
Off
7.0 MAINTENANCE AND SERVICE
7.1 PREVENTIVE MAINTENANCE
7.1.1 General
Because of their construction, Tronair converters require practically no maintenance. The few operations necessary should be
carried out carefully since they contribute to the trouble-free operation and increased service life of the installation.
7.1.2 Cleanliness
Always ensure that the system environment is kept as free as possible of dust, metal chips, lubricants, etc. Check at regular
intervals, that all air inlets and outlets are free of dust and are not blocked by any obstructions, sheets of papers, etc. Air inlets
(underside of the roof) should be vacuumed from time to time.
In no circumstances use compressed air since this can force dust particles into the interior and cause malfunctions.
7.1.3 Voltage Check
To ensure that the set is delivering the correct voltage we recommend that this be checked at regular intervals.
7.2 SERVICE
Prior to delivery each converter is subjected to a thorough check, which includes running at full load for a prolonged period,
and the prescribed overload test. Faults should not normally occur during proper, careful handling. Faults cannot be entirely
ruled out, however, if caused by transportation, unfavorable environmental or operating conditions, or incorrect operation.
If a fault occurs and you are unable to rectify this yourself with the aid of the fault table, please contact us at:
TRONAIR, Inc. Telephone: [phone] or 800-426-6301
1 Air Cargo Pkwy East Fax: [phone]
Swanton, Ohio 43558 USA E-mail: [email protected]
Website: www.tronair.com
With all enquiries please state the model number and serial number of the equipment. These are located on the front panel of
the unit.

28.5 VDC Ground Power Unit
Models 112850S0000 112850S0100 112850S0200
112850D0000 112850D0100/AV 112850D0100-A5 112850D0200
112860S0000 112860S0100 112860S0100-A4 112860S0100-A6 112860S0200
112860D0000 112860D0100 112860SD100-A5 112860D0200 112860SD200-A5
06/2013 | Rev. 03 Page | 17
8.0 ADDITIONAL INFORMATION
8.1 LED FUNCTIONS & ARRANGEMENTS
As described in Section 3, the system control is completely digital. System control software is comprised of measurements,
evaluation of measurements, threshold control, and a programmable logic control (PLC) known as the User Program. The
individual parts are fully integrated to operate together as a software control system. The most important function is that of the
User Program. The PLC has digital inputs and outputs which converts the information coming from the hardware into a form
recognizable by the User Program software. Each input and output is monitored by an LED, and all inputs and outputs, which
are used, are shown on the control diagrams. Checking the status of these LED’s is a quick and easy way of establishing the
operational status of the converter, and is useful during fault-finding. An illuminated LED indicates a high potential (+24V) at
the hardware digital input or output. If the LED is off, then the potential is low (0V).
9.0 GUARANTEES/LIMITATION OF LIABILITY
Tronair products are warranted to be free of manufacturing or material defects for a period of one year after shipment to the
original customer. This is solely limited to the repair or replacement of defective components. This warranty does not cover the
following items:
a) Parts required for normal maintenance
b) Parts covered by a component manufacturers warranty
c) Replacement parts have a 90-day warranty from date of shipment
If you have a problem that may require service, contact Tronair immediately. Do not attempt to repair or disassemble a product
without first contacting Tronair, any action may affect warranty coverage. When you contact Tronair be prepared to provide the
following information:
a) Product Model Number
b) Product Serial Number
c) Description of the problem
If warranty coverage is approved, either replacement parts will be sent or the product will have to be returned to Tronair for
repairs. If the product is to be returned, a Return Material Authorization (RMA) number will be issued for reference purposes
on any shipping documents. Failure to obtain a RMA in advance of returning an item will result in a service fee. A decision on
the extent of warranty coverage on returned products is reserved pending inspection at Tronair. Any shipments to Tronair must
be shipped freight prepaid. Freight costs on shipments to customers will be paid by Tronair on any warranty claims only. Any
unauthorized modification of the Tronair products or use of the Tronair products in violation of cautions and warnings in any
manual (including updates) or safety bulletins published or delivered by Tronair will immediately void any warranty, express or
implied.
The obligations of Tronair expressly stated herein are in lieu of all other warranties or conditions expressed or implied. Any
unauthorized modification of the Tronair products or use of the Tronair products in violations of cautions and
warnings in any manual (including updates) or safety bulletins published or delivered by Tronair will immediately
void any warranty, express or implied and Tronair disclaims any and all liability for injury (WITHOUT LIMITATION and
including DEATH), loss or damage arising from or relating to such misuse.
10.0 APPENDICES
APPENDIX I Wiring Diagram and Schedule –Single Output
APPEDIX II Diagram and Schedule –Dual Output
APPENDIX III Declaration of conformity