TDK-Lambda THR4 User manual

THR4
Installation,Operation,andMaintenanceManual
THR4
THR400
August 2009
Version A4
This datasheet has been downloaded fromhttp://www.digchip.com at this page

Revision A4 : August, 2009
3055 Del Sol Blvd • San Diego, CA 92154 • 1-800-LAMBDA-4
THR4-SSERIES POWER SYSTEM
Page. 2
Table
of Contents
1)
Safety and Recommended Practices 3
1.1 General practices 3
1.2 FCC Compliance Statement 4
Warning 4
2)
Product Section 5
2.1 Power Module Specification 5
2.1.1 DC Output Voltage 5
2.1.2 Heat Dissipation 5
2.2 AC input Voltage Requirements 6
2.2.1 AC Input Voltage 6
2.2.2 AC Input Wire Diagrams 6
2.2.3 AC current and cable sizing 7
2.3 DC Input Diagrams 9
2.3.1 Circuit Drawings 9
2.3.2 DC Reference Ground 9
2.3.3 DC Wire Sizing 9
2.3.4 DC lug requirements 10
2.4 Torque Settings 11
3)
Required Tools 11
4)
Site and Equipment Preparation 11
5)
Power Plant Mounting and Wiring 11
5.1 Mechanical mounting 11
5.2 AC input 12
5.2.1 Dual feed with terminal blocks 12
5.2.2 Individual feed with terminal blocks 13
5.2.3 Individual feed with IEC320 receptacle 13
5.2.4 AC cord brackets 13
5.3 DC Output 14
5.3.1 Circuit 1 15
5.3.2 Circuit 23 15
5.4 Alarm connections 15
5.5 NIC interface 16
5.6 I2C communictaion connection 16
6)
Test and Turn-uup 17
6.1 Power Up 17
7)
Alarm Cable Pinout 17
8)
Replacement Items 19
9)
Troubleshooting 20
9.1 Problems and solutions 20
9.2 Short circuit & current limit 20
10)
NIC Information 21
10.1 NIC card settings 21
10.2 NIC card replacement 24

3055 Del Sol Blvd • San Diego, CA 92154 • 1-800-LAMBDA-4
THR4-SSERIES POWER SYSTEM
This product accepts a nominal AC Voltage
between 100 and 240 VAC, 47 to 63 Hz,
and produces a regulated output of 10.5-14
VDC capable of delivering a max of 400
Amperes (300 amps continuous) DC for 12V
rectifiers, 21-28 VDC capable of delivering a
max of 200 Amperes DC for 24V rectifiers,
28-42V
capable of delivering a max of 160 amperes
DC for 36V rectifiers, 42-56 VDC capable of
delivering a max of 200 Amperes DC for
48V rectifiers, in an ambient operating tem-
perature range of -40°C to +70°C (depend-
ing upon deployed rectifiers and shelf).
HAZARDOUS
VOLTAGE AND ENERGY
LEVELS
ARE PRESENT WHICH CAN
PRODUCE
SERIOUS SHOCKS AND
BURNS.
Only authorized, qualified, and trained per-
sonnel should attempt to work on this equip-
ment. Refer to datasheets for full product
specifications.
Observe all local and national electrical,
environmental, and workplace codes.
Each power shelf should be fed from a dedi-
cated AC branch circuit of a Terra Neutral
(TN) power system.
If a line cord(s) is (are) used as the AC
connection means, the plug end of the cord
is considered to be the primary disconnect
means, and reasonable access must be
given to the plug and receptacle area. The
receptacle must be fed with a breaker or
fuse according to Table 4.
For hard-wired AC connections, a readily
accessible disconnect device shall be incor-
porated in the building installation wiring.
Select a wall breaker and wire sizes accord-
ing to Table 4.
CAUTION:
ALL RECTIFIERS EMPLOY INTERNAL
DOUBLE
POLE/NEUTRAL FUSING
Use double hole, UL listed lugs for all DC
connections to prevent lug rotation and inad-
vertent contact with other circuits.
Class 1 wire is recommended for all DC con-
nections. Minimum wire sizes are shown in
Table 5. In practice, loop voltage drop con-
siderations will usually dictate larger than
minimum safe wire size.
Connection and mounting torque require-
ments are listed in Table 7.
Lambda does not recommend shipping the
rack with the power modules installed. Power
modules should be shipped in separate boxes.
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1
Safety and Recommended Practices
1.1
General practices
For use in restricted access locations only.
Suitable for mounting on concrete or other non-combustible surfaces

1.2
FCC Compliance Statement
Note: This device complies with Part 15 of FCC Rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause
undesired operation.
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio communica-
tions. Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
1.2.1
Warning
Changes or modifications to this unit not expressly approved by the party responsible for the
compliance could void the user's authority to operate this equipment.
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THR4-SSERIES
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2
Product Section
2.1
Power Module Specification
2.1.1
DC Output Voltage
Table 1 shows the DC voltage range and max current for each model of power module for this system.
2.1.2
Heat Dissipation
Table 2 displays the max and typical BTU/hr of heat dissipated for each power module.
Max is calculated at 180VAC, Max VDC and current values for the power module, and typical is
calculated at 240 VAC, typical VDC and current values.
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THR4-SSERIES POWER SYSTEM
DC Output Voltage
TH120048 42-56 25
TH200048 42-56 40
TH250048 42-56 50
TH200036* 28-42 40
TH120024 21-28 50
TH120012 10.5-14 100
Model Voltage min/max Max Current
Table
1
Heat Dissipation
TH120048 451 833
TH200048 635 897
TH250048 794 1106
TH200036 423 648
TH120024 564 856
TH120012 735 992
Model Typical BTU/hr Max BTU/hr
Table
2
*max power 1440 watts

AC Line 1
AC Line 2
Power Module 1
N+1 DC Out
Power Module 2 Power Module 3
Power Module 4
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2.2
AC Input Requirement
2.2.1
AC Input Voltage
Table 3 shows the required AC input voltages for the available power modules. The power mod-
ules under wide line (WL) can be connected to a nominal input voltage between 100 V & 240V.
The power modules under high line (HL) can be connected to a nominal input voltage between
200 V & 240V.
Table
3 - Power Module Input Voltages
2.2.2
AC Input Wire Diagrams
This system utilizes a dual or individual feed AC architecture (Figure 1 & Figure 2).
2.2.2.1
Dual feed
A system with a dual feed AC architecture feeds power module slots 0 & 1 with feed 1, and
power module slots 2 & 3 with feed 2. The AC connections on the shelf are made via rear
accessed compression style terminal blocks see Figure 6. These terminal blocks will accept up to
a maximum of a 10 AWG wire, and should be torqued to 6 in-lbs. Keep this wire size limitation
in mind when sizing the quantity and size of the power modules. Size your AC breaker and
wiring according to Table 4.
Figure
1 - Dual Feed AC wiring architecture
Table
3
Power Module Input Voltages
TH120048 TH200048
TH120024 TH200036
TH75012 TH250048
TH120012
Wide Line (100V - 240V) High Line (200V - 240V)

AC Line 1 AC Line 2 AC Line 3 AC Line 4
Power Module 1
N+1 DC Out
Power Module 2 Power Module 3
Power Module 4
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THR4-SSERIES POWER SYSTEM
2.2.2.2
Individual feed
A system with an individual feed AC architecture feeds each power module slot with an AC feed.
There are two different styles of individual feeds for this system.
The first style of connection is made via rear accessed compression style terminal blocks see
Figure 6. These terminal blocks will accept up to a maximum of a 10 AWG wire, and should be
torqued to 6 in-lbs.
The second style is made via rear accessed IEC320 receptacles, see Figure 8. The connections
should be sized with an AC service no larger than 15 amps. Keep this limitation in mind when
sizing the power modules. Securing brackets are available to hold the IEC320 AC cords to the
shelf, see Figure 9 for more information. Size your AC breaker and wiring according to Table 4.
Figure
2 - Individual feed AC wiring architecture
2.2.3
AC current and cable sizing
To size your AC feeds properly, use the example below. Failure to size the AC breaker and wiring
properly can result in nuisance breaker trips or even fire. If you anticipate future growth, size the
AC breaker and wiring for the expected future capacity.
Use section 2.2.2 to determine your AC input architecture, for example a dual feed.
Determine the quantity and model number of the power modules that will be used, for example
two TH120048 (48V, 25A).
Determine the sites AC input nominal AC voltage and compare it to Table 3 for power module
compatibility, for example, the TH120048 power module will accept either low line or high line
AC voltage.

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For this example we will assume that future growth is necessary so we will size the AC feed for
four power modules. Using Table 4, each AC feed, to the pair of TH120048, power modules will
require will require a 20 amp breaker with 12 AWG wire, at high line, per feed.
NOTE: Under-sizing your AC breaker and wiring could cause nuisance breaker trips and system
outages. ALWAYS
FOLLOW NEC RULES AND YOUR LOCAL COMPANY PRACTICES WHEN
SELECTING
DC WIRING AND
PROTECTION.
The Table 4 below uses a minimum nominal input voltage to determine AC current requirements.
90 V corresponds to a nominal low line voltage of 100VAC and 180 V corresponds to a nominal
highline voltage of 200VAC.
Individual
Feed
Dual
Feed
Recommended AC Circuit Breaker & Wire Sizes
Number of Model # Minimum Maximum Circuit Breaker 90°C Minimum Wire
Type of Power Modules of Power Input
rated AC Minimum Value Gauge to use at 30°C
Feed on AC Feed Module Voltage Current (Amps) to use (Amps) ambient (AWG)
TH120048 90 17.6 20 12
TH120048 180 8.8 15 14
TH200048 180 13.8 15 14
TH250048 180 16.9 20 12
TH200036 180 9 15 14
TH120024 90 17.4 20 12
TH120024 180 8.7 15 14
TH120012* 90 15 15 12
TH120012 180 8.9 15 14
TH120048 90 35.2 N/A N/A
TH120048 180 17.6 20 12
TH200048 180 27.6 30 10
TH250048 180 33.8 N/A N/A
TH200036 180 9 20 12
TH120024 180 17.4 20 12
TH120012* 90 30 30 10
TH120012 180 17.8 20 12
*1200W Table
4
1
2

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THR4-SSERIES POWER SYSTEM
2.3 DC Output Wire Requirements
2.3.1
Circuit Drawings
Figure
3 - DC Wire Diagram
Each system is equipped with 2 unprotected bulk output connections; one set located on each
side of the rear of the shelf. The THR4 rack will only accept lugs and THR400 will accept lugs or
bus bars. Unprotected bulk connections are double, ¼"-20 (M6) studs with 5/8" centers. The
maximum tongue width for bulk connections is 0.67". Select a wire or bus bar size for the bulk
outputs according to the current rating as shown in Table 5. Choose lugs according to section
Table 6. The polarity of the system is universal; therefore the polarity of the output is determined
by the system grounding. See section 2.3.2 for more detail. The THR4 is capable of delivering a
max of 200 amps total, 100 amps per side. The THR400 is capable of delivering a max of 400
amps total (300 amps continuous), 200 amps per side.
2.3.2 DC
Reference Ground
The Lambda Power system is a fully floating system. This means that neither the positive nor the
negative are tied to the chassis or an earth ground. An external reference or earth ground may
be connected to either the positive output or the negative output depending the desired output
polarity. As always follow your company's guidelines for sizing and attaching a reference ground.
2.3.3
DC Wire Sizing
There are two main considerations for sizing DC wire, ampacity and voltage drop. Ampacity
refers to a safe current carrying level as specified by non-profit organizations such as
Underwriters Laboratories and the National Fire Prevention Association, which publishes the
National Electric Code. Voltage drop is simply the amount of voltage loss in a length of wire
due to ohmic resistance of the conductor. DC wire may be sized for either ampacity or voltage
drop depending on branch load loop length and conductor heating. In general, ampacity
considerations will drive wire selection for short loop lengths (less than 50 feet) and voltage
drop will drive wire selection for long loop lengths (greater than 50 feet).

The National Electric Code table 310.16 provides ampacity values for various sizes, bundles, and
insulation temperature rated wire. ALWAYS
FOLLOW NEC RULES AND YOUR LOCAL COMPANY
PRACTICES
WHEN SELECTING DC WIRING AND PROTECTION.
Table 5 shows recommended
wire sizes.
Unprotected
DC output wires shall be based on the total power module capacity of the rack. For
example,
using Table 5 below, a system with two V1000A (48V, 20A) rectifiers for a total capacity
of
40 A requires one 10 AWG set of cables.
2.3.4
DC lug requirements
Table 5 below is a list of lug part numbers from Burndy that can be used for DC connections.
Wire type should be considered when determining the type of lug to use. These part numbers are
based on flex style cable. Follow your company practices when determining the exact lug
required. Systems requiring more than a 2 AWG (max 125 A) connection will need custom bus
bars. Note: ¼" holes will work on M6 studs.
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Min. Recommended DC AWG for 90°C
Cabling
10 16 AWG*
20 14 AWG
30 12 AWG
40 10 AWG
50 8 AWG
75 6 AWG
100 2 AWG
125 2 AWG
150 (1)1 AWG or (2) 6 AWG
175 (1)2/0 AWG or (2) 4 AWG
200 (1)3/0 AWG or (2) 2 AWG
Total Power Module Wire & Lug Gauge (AWG) using 90°C
Current Rating (A) wire (NEC Table 310.16)
Table
5
* For wire sizes less than 15 A not covered in NEC Table
310.16 use Table 3B - Sizes of Conductors, UL60950, "Safety
of Information Technology Equipment", Dec., 2000 for non-
building wiring.
Lug Part Number for DC Output
Total Power Burndy Amp Ring
Supply Wire Lug Part Terminal Part
Capacity AWG # # Desciption
10 AMPS 16 AWG 321045 SH Ring Terminal 1/4 Stud
15 AMPS 14 AWG 321045 SH Ring Terminal 1/4 Stud
20 AMPS 12 AWG 323763 SH Ring Terminal 1/4 Stud
30 AMPS 10 AWG 323763 SH Ring Terminal 1/4 Stud
30 AMPS 10 AWG YAV102TC14 DH Lug Standard Barrel 1/4 Stud, 5/8 Center
50 AMPS 8 AWG YA8CL2TC14 DH Lug Standard Barrel 1/4 Stud, 5/8 Center
75 AMPS 6 AWG YAV6C-L2TC14-FX DH Lug Standard Barrel 1/4 Stud, 5/8 Center
100 AMPS 2 AWG YAV2C-L2TC14-FX DH Lug Standard Barrel 1/4 Stud, 5/8 Center
125 AMPS 2 AWG YAV2C-L2TC14-FX DH Lug Standard Barrel 1/4 Stud, 5/8 Center
Table
6

2.4
Torque Settings
Table 7 shows recommended torque settings for all mechanical and electrical connections accord-
ing to screw or nut size.
Table
7 - Recommended Torque Settings
3
Required Tools
Lambda power modules are designed to be installed with a minimum number of commonly
available tools:
· #1 & #2 Phillips screwdrivers
· Torque wrench
· 5/16" and 7/16" box wrenches, sockets, and/or nut drivers
· Wire and cable strippers
· Wire and cable crimpers
4
Site and Equipment Preparation
After removing equipment from boxes and packing material, inspect for shipping and/or other
damage. Contact sales or technical support immediately if any damage is present. Have all tools,
wire, cables, hardware, etc., within easy reach. To the extent possible, ensure a clean (free of
debris, dust, foreign material, etc.) work environment. Care should be taken in the installation
process to prevent exposure of the equipment to wire clippings. If possible, the power modules
should remain sealed in their shipping boxes until the shelf wiring is complete. Ensure all AC and
DC power sources are off and disconnected.
5
Power Plant Mounting and Wiring
5.1
Mechanical Mounting
This equipment is intended for normal operations and is to be installed in a standard 19" enclosure.
It is recommended that one person lift the shelf into place while another installs using the sup-
plied mounting hardware. Torque mounting hardware according to Table 7.
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THR4-SSERIES POWER SYSTEM
Recommended Torque Settings
4-40 6
6-32 12
8-32 22
10-32 37
12-24 50
¼-20/M6 65
Screw or Nut Size Torque (in-lbs)

Figure
4 - Mounting brackets
5.2
AC input
5.2.1
Dual feed with terminal blocks
Remove safety cover over the terminal block shown in Figure 5. Feed AC wires through hole on
terminal block cover and connect wires from AC cord into appropriate positions labeled in Figure 6.
Connect your first line/hot to L1, your second line or neutral to L2/N, and finally your AC ground
to GRD. Tighten screws to 6 in-lbs, tie AC cord to safety cover, and replace terminal block safety
cover.
Figure
5 - Dual Feeds (with covers) (THR400)
Figure
6 - AC terminal block with cover removed
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THR4-SSERIES
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AC feed 2
with cover
AC cord tie down
connection
Blank Blank
AC feed 1
with cover
Mounting
brackets

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THR4-SSERIES POWER SYSTEM
5.2.2
Individual feed with terminal blocks
Remove safety cover over the terminal block shown in Figure 6. Feed AC wires through hole on
terminal block cover and connect wires from AC cord into appropriate positions labeled in Figure
6. Connect your first line/hot to L1, your second line or neutral to L2/N, and finally your AC
ground to GRD. Tighten screws to 6 in-lbs, tie AC cord to safety cover, and replace terminal
block safety cover.
Figure
7 - Rear view (Terminal block individual feed) (Special Order)
5.2.3
Individual feed with IEC320 receptacle
Plug in the appropriate cord in to the AC connections on the back of the shelf and secure with the
AC cord brackets provided.
Figure
8 - Rear View
(IEC320 AC Connections) (THR4)
5.2.4
AC Cord Brackets
Optional brackets are available to secure the IEC320 plugs to the shelf on an individual feed sys-
tem. Follow the instructions below for using these brackets.
Place the bracket on the plug as shown in Figure 9. You can secure it to the plug by tightening
with the screw on the bracket
AC Receptacle 4 AC Receptacle 3 AC Receptacle 2 AC Receptacle 1
AC Receptacle 4 AC Receptacle 3 AC Receptacle 2 AC Receptacle 1

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THR4-SSERIES
POWER SYSTEM
Figure
9 - AC cord bracket
After plugging the cords into the shelf, secure the brackets to the shelf with #4-40 screws provid-
ed as seen in Figure 10.
Figure
10 - Securing bracket to shelf
5.3
DC Output
DC connections are accomplished via the two rear bulk output connection as shown in Figure 11
(THR4) & Figure 12 (THR400). Torque connections according to Table 7. DO NOT exceed the
current rating of the shelf from section 2.3.
#4-40 screws
Cord bracket
IEC320 AC cord
Set Screw

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5.3.1
Circuit 1
Remove plastic knockouts from DC cover. Connect lugged wires to the rear accessed bulk out-
puts. Verify polarity of connections before power units on. Outputs are labeled "+" for positive
and "-" for negative. A DC reference ground should be connected to the appropriate output for
desired polarity of the system. Repeat connections for the other side.
Figure
11 - DC output connections (THR4)
5.3.2
Circuit 23
Connect lugged wires or bus bars to the rear accessed bulk outputs. Verify polarity of connec-
tions before power units on. Outputs are labeled "+" for positive and "-" for negative. A DC ref-
erence ground should be connected to the appropriate output for desired polarity of the system.
Repeat connections for the other side.
Figure
12 - DC
output connections (THR400)
5.4
Alarm Connections
Access to alarms and control signals is accomplished by plugging a via rear mounted alarm
cable into connector as shown on Figure 13. The alarm cable from Lambda has a part number
of TLRC01. See section 7 for more information on alarms. See section 7 for more information
on the alarm cable.
Plastic knockouts

THR4-SSERIES
POWER SYSTEM
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Alarm Connection NIC connections RJ45/RS232
Figure
13 - Alarm Connection
5.5
NIC interface (optional)
An optional NIC interface is available. The Nic card has a 10/100 baseT (RJ45) connection in
the front of the shelf with a RS232 (RJ45) in the rear. Follow directions in NIC "Quick Start
Guide".
5.6
Multiple Shelf Connection
Input and output 12C communication ports are available to daisy chain multiple shelves together
for single controller communication. Multiple shelf communication through the web interface is
only available with a special NIC controller. This controller is limited to a maximum of four
shelves. Contact factory for assistance.
Inter-shelf communication is available for multiple shelf configuration purposes through two RJ45
ports, pointed out in Figure 14, on the rear side of the shelf. Connect the first cable from the
output of the top power shelf to the input of the next shelf. Repeat this procedure until all shelves
are connected in a connected in a chain. In addition, a termination cable must be inserted into
the 12C input port of the top most shelf. Finally, all outputs, both positive and negative, must be
tied to a single DC bus.
Figure
14 - I2C communication ports
I2c output port
I2c input port

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6
Test and Turn-UUp
6.1
Power Up
Once all AC and DC connections have been secured and checked, install each power module
sequentially by sliding and latching each power module into a rack position as shown in Figure
17. The power module latches must be open for installation. Attempting to install the power mod-
ules with the latches closed will result in mechanical damage to the power modules and the rack.
The power modules will start in high fan speed mode and reduce their speed according to the
ambient and plant conditions within 10 seconds. If an optional NIC card is not installed the
power modules will ship from the factory with a default voltage value of 12VDC, 24 VDC, or 48
VDC depending on power modules deployed. This value can be changed at the factory upon
request or via an optional NIC card (see NIC Information section at end of document).
7
Alarm Cable Pinout
Access to alarms and control signals is accomplished via a rear mounted connector with a mating
cable part number TLRC01 (Figure 16). Table 8 provides a pin functional description.
· The pin out of the alarm connector on the shelf is a 180° different from a standard
Molex connector, see Figure 15.
· AC fail, DC fail, and Thermal limit fail alarms are all open collector, opto-coupled, active
high on failure/active low normally, and referenced to pin 17. The pin is able to sink 10
mA of current at 5 V and 5 mA at TTL voltages.
· Applying 5 V between pins 16 and 17 will shut all power modules down. Removing the
5V will cause the power module to power back up.
· Tie pin 9 from multiple racks to current share between racks.
· Parallel alarms and signals together for multiple racks.

Figure
15 - Alarm Connection
Figure
16 - Alarm cable pin out (TLRC01)
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POWER SYSTEM
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Alarm connection
Pin 11
Pin 1
Pin 20
Pin 1
Pin 11
Pin 10
Pin 20

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Table
8
Alarm and Signal Interconnections
20 BLK Shelf Bias: A regulated 12V/100ma bias supply. Referenced to Pin 10.
19 RED SCL: I2C clock line. Referenced to Pin 10.
18 RED/WHT SDA: I2C clock line. Referenced to Pin 10.
17 RED/BLK Logic Ground: Isolated ground for opto-coupled alarms, connect to Pin 10.
16 GRN/WHT Module Disable: Opto-coupled input. Applying 5V between this pin
and Pin 17 will disable all modules in the rack.
15 LT BL Module 0 (leftmost slot) AC Fail.
14 LT BL/WHT Module 1 AC Fail
13 LT BL/BLK Module 2 AC Fail
12 YLW/WHT Module 3 AC Fail
11 YLW/BLK Not Used
10 TAN/WHT V Main Output (-). DC power ground.
9 TAN/BLK I Shelf: Indicates average rack current. Ratio varies with power
module type. Call factory for details.
8 TAN Open
7 GRN/BLK Open
6 GRN Module Thermal Limit Failure
5 OR/WHT Module 0 (leftmost slot) DC Fail.
4 OR/BLK Module 1 DC Fail
3 OR Module 2 DC Fail
2 WHT Module 3 DC Fail
1 YLW Module Present
J1 Wire Description
Pin Color
8
Replacement Items
The power modules are modular field replaceable (hot swappable) units. In the event that a
power module needs to be removed, press the latch button on the front of the power module,
and pull the handle until the power module slides out of the slot. Open the latch on the new
power module and slide it into an empty slot. Close the latch and the power module will start up
automatically and will begin sharing current.
If an optional NIC is installed the power module will automatically set the voltage specified by the
NIC, otherwise it will be at the factory default.

THR4-SSERIES
POWER SYSTEM
Revision A4 : August, 2009
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Figure
17 - Power Module Removal
9
Troubleshooting
9.1
Problems and Solutions
The modular, plug-n-play nature of this plant makes diagnostics and repair very easy. Make sure
that all power modules are properly seated and latched into their respective slots. Make sure that
all power and signal connectors are properly mated. Table 9 lists problems and potential solu-
tions.
9.2
Short Circuit
& Current Limit
ILimit can be adjusted up to +105% of the rated current of the power module. The system volt-
age will remain constant up to ILimit at which point the system voltage will drop quickly toward
0 VDC, as in Figure 18. Once a 24V or 48V power module drops below 12 VDC for more than
5 seconds, the system will shut down. For a 12V system, once the power module drops below 4V
for more than 60 seconds, the system will shut down. The system will automatically restart after
60 seconds, and will continue until the short circuit is cleared.
Latch Button Latch Handle
Problems and Solutions
DC OK LED extinguished or
Module DC fail fromalarm cable
AC OK LED Extinguished or
Module AC fail from alarm cable
Thermal Limit Failure
Problem Solution
Replace bad power module unit - unlatch, remove and replace with spare.
System short circuit - inspect and replace load and wiring.
Reset commercial circuit breaker to the dedicated AC circuit that feeds system. Seek
alternative power source until power is restored.
Power module has shut down because it has exceeded the maximum rated temperature.
The power modules will automatically restart.
Table
9 - Problems and Solutions