Gamatronic CENTRIC 50 kW User manual

G
AMATRONIC
E
LECTRONIC
I
NDUSTRIES
L
TD
.
17 Hartom St., PO Box 45029, Jerusalem 9777517, Israel
Tel: [phone] Fax: [phone]
Email: [email protected] Website: www.gamatronic.com
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fo or rm mo od de el ls s5 50 0k kV VA A- -2 20 00 0k kV VA A
50 kVA model
with internal battery
200 kVA model
Release 3.4, May 2017
This manual is
for products
101SBD6*.

ii CENTRIC User Guide, rel. 3.4
GAMATRONIC ELECTRONIC INDUSTRIES LTD.
Har Hotzvim Industrial Park
17 Hartom St., P.O.B. 45029, Jerusalem 9777517, Israel
Tel: [phone] Fax: [phone]
Email: [e-mail] Website: www.gamatronic.com
The equipment described in this document is not intended to be used in connection with any application
requiring fail-safe performance, unless the application design includes appropriate redundancy. This
exclusion includes, but is not limited to, the direct operation of any life support system or any other system
whose failure could lead to serious injury, death, environmental damage or mass destruction.
Copyright 2017 by Gamatronic Electronic Industries Ltd. All rights reserved worldwide.
Any representations in this document concerning the performance of Gamatronic's product(s) are for informational purposes only and are not
warranties of future performance, either expressed or implied. Gamatronic's standard limited Warranty, which accompanies its sales contract or
order confirmation form, is the only warranty offered by Gamatronic Electronic Industries Ltd. in relation thereto.
Gamatronic Electronic Industries Ltd. ("Gamatronic") warrants the products it manufactures to be free from defect for a period of one calendar
year from the date of invoice, including the date of invoice. Gamatronic's liability is limited to repairing or replacing any defective parts in the
equipment under warranty. Gamatronic reserves the right to determine whether the repair work shall be performed at Gamatronic's factory, at the
customer's premises, or at an alternate site. The customer must obtain authorization from Gamatronic before returning any parts or equipment to
Gamatronic for repair or replacement. Any items returned to Gamatronic must be sent freight prepaid.
Gamatronic’s liability and warranty to the product are according and subject to the fulfilment and implementation by the customer of all the terms
and instructions in connection with “preventive maintenance” and “service and repair” as further detailed in the user guide which is attached to the
product and forms an integral part of it.”
Gamatronic is not responsible for any damage to the product due to unauthorized repair work, misuse or abuse of the product, or force majeure.
If the product is delivered without batteries, Gamatronic is not responsible for any damage or malfunction due to incorrect wiring of the batteries.
Gamatronic is not liable for and the Purchaser waives any right of action it has or may have against Gamatronic for any consequential or special
damages arising out of any breach of warranty, and for any damages that the Purchaser may claim for damage to any property or injury or death
to any person arising out of its purchase or the use, operation or maintenance of the subject product.
This warranty includes parts and labor; however, Gamatronic shall not be responsible for any labor subcontracted or performed by the Purchaser
to prepare the warranted item for return to Gamatronic or Gamatronic's agent.
This warranty is subject only to the laws of the State of Israel, and not to any foreign law. The exclusive venue for all intents and purposes shall
be a competent tribunal in the Tel Aviv area only and not any other court.
The information contained in this document is proprietary and is subject to all relevant copyright, patent and other laws protecting intellectual
property, as well as any specific agreement protecting Gamatronic's rights in the aforesaid information. Neither this document nor the information
contained herein may be published, reproduced or disclosed to third parties, in whole or in part, without the express, prior, written permission of
Gamatronic. In addition, any use of this document or the information contained herein for any purposes other than those for which it was
disclosed is strictly forbidden.
Gamatronic reserves the right, without prior notice or liability, to make changes in equipment design or specifications.
Information supplied by Gamatronic is believed to be accurate and reliable. However, no responsibility is assumed by Gamatronic for the use
thereof nor for the rights of third parties which may be affected in any way by the use thereof.
This document may contain flaws, omissions or typesetting errors; no warranty is granted nor liability assumed in relation thereto unless
specifically undertaken in Gamatronic Electronic Industries Ltd. standard limited Warranty. Information contained herein is periodically updated
and changes will be incorporated into subsequent editions. If you have encountered an error, please notify Gamatronic Electronic Industries Ltd.
All specifications are subject to change without prior notice.
The product described in this document may cause interference with radio communications if not installed and used
according to the user guide and/or installation guide. Be aware that the product is intended for use in a commercial or
industrial setting. Operation of the product in a residential area may cause harmful interference, in which case the user
will be required to correct the interference at his own expense.

GAMATRONIC ELECTRONIC INDUSTRIES LTD.
CENTRIC User Guide, rel. 3.4 iii
TABLE OF CONTENTS
1. SAFETY PRECAUTIONS .......................................................................................... 1
2. INTRODUCTION .................................................................................................. 3
2.1 System structure..................................................................................................................3
2.2 LCD Control Panel...............................................................................................................6
2.3 System controller .................................................................................................................7
2.4 UPS module (25 kVA / 25 kW).............................................................................................7
2.5 Static switch module ............................................................................................................7
2.6 Battery..................................................................................................................................7
2.7 Emergency Power Off – EPO (manual)...............................................................................8
2.7.1 EPO indication ........................................................................................................8
2.7.2 Battery trip coil ........................................................................................................8
3. OPERATING MODES ............................................................................................. 9
3.1 Normal mode........................................................................................................................9
3.2 Battery mode........................................................................................................................9
3.3 Bypass mode .......................................................................................................................9
4. USER INTERFACE ............................................................................................... 10
4.1 Control panel......................................................................................................................10
4.1.1 Calibrating the touch screen.................................................................................10
4.2 Buttons and LEDs on the system controller.......................................................................11
4.2.1 “UPS off” button ....................................................................................................11
4.2.2 “Alarm” LED ..........................................................................................................11
4.2.3 “CPU active” LED..................................................................................................11
4.2.4 “CPU On/Off” button..............................................................................................11
4.3 Fallback push-button control panel....................................................................................12
5. CENTRIC CONTROL SYSTEM.................................................................................. 13
5.1 The main screen (main menu)...........................................................................................13
5.2 Main Menu highlights.........................................................................................................14
5.2.1 Setup.....................................................................................................................14
5.2.2 Operation ..............................................................................................................15
5.2.3 Status....................................................................................................................17
5.2.4 Profile....................................................................................................................18
5.2.5 Log ........................................................................................................................18
5.2.6 Time ......................................................................................................................18
5.2.7 Help.......................................................................................................................18
5.3 Operating the system.........................................................................................................19
5.3.1 Turning the UPS ON.............................................................................................19
5.3.2 Turning the UPS OFF...........................................................................................19
5.3.3 Transferring the load to bypass ............................................................................19
5.3.4 Transferring the load to the inverter......................................................................19
6. CENTRIC START-UP ............................................................................................ 20
6.1 Normal (not first-time) start-up...........................................................................................20
6.2 Centric total shutdown (no ac output)................................................................................21
7. CENTRIC MENU FUNCTIONS IN DETAIL .................................................................... 22
7.1 Password requirements .....................................................................................................22

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iv CENTRIC User Guide, rel. 3.4
7.2 SETUP menu.....................................................................................................................23
7.2.1 Setup > SYSTEM..................................................................................................23
7.2.2 Setup > MODULES...............................................................................................28
7.2.3 Setup > BATTERY................................................................................................30
7.2.4 Setup > STATIC SWITCH.....................................................................................34
7.2.5 Setup > ALARMS..................................................................................................36
7.2.6 Setup > CONNECTIVITY......................................................................................37
7.2.7 Setup > TIME........................................................................................................58
7.2.8 Setup > ASSIGN SITE ID .....................................................................................59
7.2.9 Setup > DRY CONTACTS (optional feature)........................................................60
7.2.10 Setup > SAVE & RESTORE.................................................................................64
7.2.11 Setup > CHANGE AUTHORIZATION LEVEL ......................................................65
7.3 OPERATION......................................................................................................................66
7.3.1 Operation > SWITCH ON/OFF .............................................................................66
7.3.2 Operation > TRANSFER LOAD............................................................................67
7.3.3 Operation > BATTERY TEST ...............................................................................67
7.4 STATUS.............................................................................................................................68
7.5 PROFILE............................................................................................................................71
7.5.1 Profile > SYSTEM.................................................................................................71
7.5.2 Profile > BATTERY ...............................................................................................71
7.5.3 Profile > ST.SW. ...................................................................................................72
7.5.4 Profile > ALARMS.................................................................................................72
7.5.5 Profile > IDENTIFICATION...................................................................................72
7.6 LOG....................................................................................................................................73
7.6.1 The "Alarms" button on the log detail screen........................................................75
7.7 CONNECTIVITY ................................................................................................................76
7.8 TIME...................................................................................................................................77
7.9 LANGUAGE.......................................................................................................................78
7.10 HELP..................................................................................................................................78
8. MINOR REAR PANEL CONNECTORS ........................................................................ 79
9. OPERATING THE MAINTENANCE BYPASS SWITCH....................................................... 82
9.1 Putting the UPS in maintenance bypass mode .................................................................83
9.2 Returning the UPS to normal operation.............................................................................84
10. TROUBLESHOOTING........................................................................................... 85
10.1 Troubleshooting “Dc high”..................................................................................................91
10.2 Troubleshooting “Dc low”...................................................................................................92
10.3 Troubleshooting “Bypass mode”........................................................................................93
10.4 Troubleshooting “UPS modules”........................................................................................94
10.5 Troubleshooting “No output”............................................................................................101
10.6 Troubleshooting “Static switch”........................................................................................102
11. PERIODIC PREVENTIVE MAINTENANCE .................................................................. 105
12. THE BUILT-IN WEB INTERFACE (OPTION) ............................................................... 105
12.1 Preliminaries to use of the Web interface........................................................................105
13. CENTRIC SPECIFICATIONS.................................................................................. 106

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CENTRIC User Guide, rel. 3.4 v
LIST OF FIGURES
Figure 1: Major components of the Centric (200 and 100 kW models)................................................4
Figure 2: Major components of the Centric (50 kW model)..................................................................5
Figure 3: System control panel, displaying the main menu..................................................................6
Figure 4: System control panel, with current navigation path ..............................................................6
Figure 5: The control panel, displaying the Main Screen...................................................................10
Figure 6: Location of fallback push-button control panel....................................................................12
Figure 7: Close-up of the push-button control panel..........................................................................12
Figure 8: The main screen and its features........................................................................................13
Figure 9: The Operation submenu .....................................................................................................15
Figure 10: The "Turn off / on" submenu.............................................................................................15
Figure 11: The system requests confirmation....................................................................................16
Figure 12: The "Turn off / on" submenu.............................................................................................16
Figure 13: The system requests confirmation.....................................................................................16
Figure 14: The Status screen.............................................................................................................17
Figure 15: Main menu, UPS off, normal mode...................................................................................20
Figure 16: Centric main menu............................................................................................................22
Figure 17: “Key” icon on function button ............................................................................................22
Figure 18: "Setup" menu ....................................................................................................................23
Figure 19: "Setup > SYSTEM" options...............................................................................................24
Figure 20: "Setup > Modules" options................................................................................................28
Figure 21: "Setup > Battery" options..................................................................................................30
Figure 22: "Setup > Static Switch" options.........................................................................................34
Figure 23: "Setup > Alarms" options ..................................................................................................36
Figure 24: "Setup > Connectivity" options..........................................................................................37
Figure 25: Setup > Connectivity > SNMP configuration options........................................................38
Figure 26: Creating a new community................................................................................................38
Figure 27: Community name accepted ..............................................................................................38
Figure 28: Defining serial communication parameters.......................................................................39
Figure 29: Defining Modbus communication parameters...................................................................40
Figure 30: Remote shutdown submenu .............................................................................................53
Figure 31: New shutdown destination................................................................................................54
Figure 32: Select the shutdown target and press the arrow...............................................................54
Figure 33: Remote shutdown menu with target destination added....................................................54
Figure 34: Shutdown destination screen............................................................................................55
Figure 35: Example of email message body......................................................................................55
Figure 36: The email configuration menu...........................................................................................56
Figure 37: “Add new recipient” line.....................................................................................................57
Figure 38: New email recipient screen...............................................................................................57
Figure 39: Alarms button on email recipient screen...........................................................................57
Figure 40: Alarm selection screen for email recipient........................................................................58
Figure 41: "Setup > Time" options......................................................................................................58
Figure 42: Assigning a site ID ............................................................................................................59
Figure 43: "Setup > Dry Contacts" option ..........................................................................................60
Figure 44: Defining an input dry contact.............................................................................................61
Figure 45: Example of an output dry contact linked to an alarm........................................................63
Figure 46: "Setup > Save & Restore" options....................................................................................64
Figure 47: "Setup > Authorization" option..........................................................................................65
Figure 48: The "Operation" option on the main menu........................................................................66
Figure 49: "Main Menu > Status" option.............................................................................................68
Figure 50: The Status Screen ............................................................................................................68

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vi CENTRIC User Guide, rel. 3.4
Figure 51: "Main Menu > Profile" options...........................................................................................71
Figure 52: "Main Menu > Log" options...............................................................................................73
Figure 53: Listing of the log file contents............................................................................................74
Figure 54: Log record - detailed display.............................................................................................74
Figure 55: "Alarms" display from the log detail screen.......................................................................75
Figure 56: "Main Menu > Connectivity" option...................................................................................76
Figure 57: "Connectivity" display from main menu.............................................................................76
Figure 58: "Main Menu > Time" option...............................................................................................77
Figure 59: The "Time" function on the main menu.............................................................................77
Figure 60: "Main Menu > Language" option.......................................................................................78
Figure 61: "Main Menu > Help" option................................................................................................78
Figure 62: Minor connector groupings on the Centric rear panel.......................................................79
Figure 63: Close-up of connector group 1..........................................................................................80
Figure 64: Close-up of connector group 2..........................................................................................81
Figure 65: Pin numbers in D9 connectors..........................................................................................81
Figure 66: The maintenance bypass switches (option)......................................................................82
Figure 67: Normal position of the maint. bypass switches.................................................................83
Figure 68: Switch positions in maint. bypass mode...........................................................................83
Figure 69: Last shutdown reason.......................................................................................................94
Figure 70: Shutdown reason in hex, and Fault_word.........................................................................95
Figure 71: Structure of Fault_word.....................................................................................................96
Figure 72: Structure of Shutdown_reason..........................................................................................97
Figure 73: The "Detail 2" or "Technician data 2" screen....................................................................98
Figure 74: Dc voltage screen .............................................................................................................98
Figure 75: Calibration menu...............................................................................................................99
Figure 76: Status screen ..................................................................................................................102
Figure 77: Measurements on the STSW tab....................................................................................102
Figure 78: Voltage and current msmts. on the inverter output tab...................................................103
Figure 79: Bypass frequency measured at the static switch............................................................103
Figure 80: “Setup nominal values” screen .......................................................................................103
Figure 81: Setup > STSW > High-level setup..................................................................................104
LIST OF TABLES
Table 1: Battery lifetime vs. environmental temperature as per Eurobat.............................................7
Table 2: Features of the main screen.................................................................................................13
Table 3: Watchdog status and the state of the “CPU Active” LED.....................................................27
Table 4: Holding Registers for Modbus queries.................................................................................41
Table 5: Description of email parameters...........................................................................................56
Table 6: Alarms that can trigger output dry contacts..........................................................................62
Table 7: Key to Figure 50 (the Status screen) ...................................................................................69
Table 8: Log message types..............................................................................................................73
Table 9: Key to Figure 62...................................................................................................................80
Table 10: D9 pin assignments in connector group 2..........................................................................81
Table 11: Troubleshooting table.........................................................................................................86
Table 12: Interpreting Fault_word ......................................................................................................96
Table 13: Interpreting Shutdown_reason...........................................................................................97
Table 14: Technical specifications ...................................................................................................106

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CENTRIC User Guide, rel. 3.4 vii
STANDARDS AND CONVENTIONS
•This user manual contains diagrams which include images of the display screen of the UPS. Unless
otherwise indicated, the readings shown in the screen images are only illustrative, and are not
intended to match the readings on a specific system in a particular environment.
•Operation and control of the Centric UPS is accomplished through a touch-sensitive LCD display
screen. In this manual, when explaining how to navigate the control software via the touch-
sensitive screen, the terms "tap", "press", "choose", and "select" may be used interchangeably to
indicate selection of a screen option.
•Electrical abbreviations in this document are according to IEEE 280 Standard Letter Symbols for
Quantities Used in Electrical Science and Electrical Engineering.

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viii CENTRIC User Guide, rel. 3.4
This page left blank deliberately.

GAMATRONIC ELECTRONIC INDUSTRIES LTD.
CENTRIC User Guide, 3.4 1
1. SAFETY PRECAUTIONS
The UPS system is designed for industrial applications and harsh environments. Nevertheless the
UPS is a sophisticated power system and should be handled with appropriate care, according to
the following guidelines.
WARNING! HIGH TOUCH CURRENT!
EARTH CONNECTION ESSENTIAL BEFORE CONNECTING SUPPLY.
DO’S
•Read this manual carefully before starting installation and operation of the UPS.
•Review the safety precautions described below to avoid injury to users and damage to the
equipment.
•All power connections must be completed by a licensed electrician who is experienced in
wiring this type of equipment, and who is familiar with the local electrical codes and
regulations. Improper wiring may cause injury to personnel, or death, or damage to the
equipment.
•Ensure all power is disconnected before performing installation or maintenance.
•Leave at least 20 cm of clearance space between the ventilation openings of the UPS and other
objects or walls.
•The UPS must be well grounded to the building’s grounding system with a conductor that has a
current carrying capacity that matches the rating of the UPS.
•Battery installation, battery maintenance, and battery replacement shall be performed only by
authorized service personnel.
•Pay attention to all DANGER, CAUTION, and WARNING notices affixed to the inside and outside
of the UPS.
•Keep the surroundings clean, uncluttered and free from excess moisture.
•Keep the operating environment within the parameters stated in this document.
•Allow only qualified technicians to service the UPS. There are no user-serviceable components. Do
not try to repair it yourself!
•Use the UPS only for its intended purpose.
•The batteries should preferably be installed next to the UPS, or as close to it as is practically
possible.
•If you remove a UPS module from the Centric while the module is operating, wait five minutes
before reinserting the module. This allows the module’s capacitors time to discharge.
•FAST FUSES (SEMICONDUCTOR FUSES) must be used between the battery and the Centric,
and on the rectifier ac input line. For example, the Ferraz Shawmut A70QS fuse.
WARNING - RISK OF LETHAL ELECTRIC SHOCK:
The battery cabinet contains a series of batteries that provides high voltage and energy in
the UPS body even when the UPS is not connected to the ac input.
Take appropriate precautions during installation, inspection and servicing.

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2 CENTRIC User Guide, rel. 3.4
DON’TS
•Do not open the cover of the UPS or the battery cabinets under any circumstances. All UPS panels
and doors should be closed.
•Do not insert any objects through the ventilation holes.
•Do not put objects on the UPS.
•Do not move the UPS while it is operating.
•Do not use the UPS outdoors.
•Do not turn the UPS upside down during transportation.
•Do not connect or disconnect the cable to the battery cabinet before the battery circuit breaker is
turned OFF.
•Do not turn ON the battery circuit breaker when the battery cabinet is disconnected from the UPS.
•Do not install the UPS next to gas or electrical heaters. A restricted location is recommended in
order to prevent access by unauthorized personnel.
•If you remove a UPS module from the Centric while the module is operating, do not reinsert the
module immediately. Wait five minutes.
WARNING:RISK OF
SEVERE DAMAGE TO THE UPS!!!
THIS SYSTEM REQUIRES THE NEUTRAL LINE
FOR OPERATION. DO NOT CONNECT THIS
SYSTEM TO THE AC POWER SOURCE WITHOUT
A NEUTRAL (NULL)CONDUCTOR!!
FAILURE TO USE A NEUTRAL CONDUCTOR MAY
CAUSE PERMANENT DAMAGE TO THE SYSTEM.

GAMATRONIC ELECTRONIC INDUSTRIES LTD.
CENTRIC User Guide, rel. 3.4 3
2. INTRODUCTION
In general, an Uninterruptible Power Supply (UPS) provides backup power for use when the utility ac
electric power mains fail or drop to an unacceptable voltage level. Centric does this and much more.
Centric
is designed to protect your data and equipment and minimize downtime and other adverse effects
normally incurred by power irregularities and failures.
Voltage surges, spikes and sags are inherent in commercial utility power. Over time, these irregularities
shorten the life of equipment and components. Centric continually eliminates power irregularities, thus
helping to extend the life of your equipment, even through normal use when the input power is constant
and continuous.
Centric
requires very little attention or intervention during normal operation; however, you should read and
understand the procedures described in this manual to ensure trouble-free operation.
Centric has a "true on-line battery" design in accordance with IEC62040-3. It is a "green" power solution
thanks to low input THD, and provides regulated, stable power to your loads. Centric employs active
current balancing between power modules, and delivers overall electrical efficiency of up to 96 %, up to
98 % in backup mode.
2.1 System structure
The Centric is available in three cabinet sizes:
•200 kVA – holds up to eight internal UPS modules
•100 kVA – holds up to four internal UPS modules
•50 kVA – holds up to two internal UPS modules
Each UPS module has a maximum output capacity of 25 kVA / 25 kW.
Each Centric unit also includes:
•a system controller
•a static switch module
•an LCD control panel

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4 CENTRIC User Guide, rel. 3.4
200 kW model
100 kW model
Figure 1: Major components of the Centric (200 and 100 kW models)

GAMATRONIC ELECTRONIC INDUSTRIES LTD.
CENTRIC User Guide, rel. 3.4 5
Figure 2: Major components of the Centric (50 kW model)

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6 CENTRIC User Guide, rel. 3.4
2.2 LCD Control Panel
The LCD control panel (Figure 3) is the user's main interface with the Centric. The LCD panel is touch-
sensitive –the user navigates through the system screens by pressing lightly on the various icons. On all
screens other than the main menu screen, the current navigation path is displayed in the upper-left corner
of the screen (Figure 4), enabling you to easily understand where you are within the control system menus.
The extensive capabilities of the user interface are described in detail in chapter 7 "Centric menu functions
in detail".
Figure 3: System control panel, displaying the main menu
Figure 4: System control panel, with current navigation path

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CENTRIC User Guide, rel. 3.4 7
2.3 System controller
The Centric system controller has three purposes:
•Controls and monitors the operation of the Centric according to the user's commands.
•Collects and summarizes data from all sections of the UPS.
•Manages communication with external computers for data transfer and operation.
The Centric can operate without the system controller but with reduced functionality.
2.4 UPS module (25 kVA / 25 kW)
The UPS module is the core of the Centric, which consists of from one to eight identical internal modules
operating in parallel.
Each UPS module includes a 3-phase charger with PFC (power factor correction) and a 3-phase PWM
(pulse-width modulation) inverter connected to batteries by a classic dc link.
2.5 Static switch module
The centralized hybrid static switch enables an automatic transfer of the load from the output of the
inverters to an alternate source – the ac mains, for example – when the inverter is unable to supply
sufficient power to the load (for example, in the event of an overload, or an inverter failure). The static
switch transfers high currents at very high speed; a typical transfer time is 3 ms.
2.6 Battery
The Centric battery bank provides backup power to the UPS and its load devices in the event that the
utility ac input fails. The batteries are housed in an external cabinet adjacent to the Centric. (The Centric
can also be placed on top of the battery cabinet.) The batteries are charged by the rectifier that supplies
both the inverter and the battery charger.
The Centric supports the use of standard lead-acid batteries, and also lithium-ion batteries. If you plan to
use lithium-ion batteries, consult with your dealer to be sure that the battery setup parameter values are
appropriate for the batteries you will be using.
The battery cabinet should be installed as close to the UPS as is practically possible.
Fast-acting fuses (semiconductor fuses) must be used between the battery and the UPS.
Protect the batteries from moisture, dampness, and foreign substances.
The temperature of the battery's surroundings influences the batteries' useful lifetime.
Table 1: Battery lifetime vs. environmental temperature as per Eurobat
ENVIRONMENTAL
TEMPERATURE ACHIEVABLE PERCENTAGE OF BATTERY'S RATED LIFETIME
20 °C 100 %
30 °C 50 %
40 °C 20 %

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8 CENTRIC User Guide, rel. 3.4
2.7 Emergency Power Off – EPO (manual)
An external Emergency Power Off (EPO) switch may be installed on the Centric by the customer. The
EPO switch is used to cut power to the load in emergency situations. Refer to the section "Emergency
Power Off" in the Centric Installation Guide for further information.
2.7.1 EPO indication
Any of the output dry contacts can be assigned to indicate when the EPO switch has been activated. The
output dry contact can be used to trigger an external circuit if desired, such as a lamp or an audible alarm.
2.7.2 Battery trip coil
The Centric’s battery trip coil terminals are intended to be connected to the trip coil of the battery circuit
breaker. When this is done and the EPO switch is activated, the Centric sends a voltage pulse to the
battery circuit breaker trip coil, causing the battery circuit breaker to turn OFF.
Use of the battery trip coil means that not only will use of the EPO switch cut all ac output from the UPS, it
will also turn off the battery circuit breaker. Refer to the section "Battery trip coil" in the Centric Installation
Guide for further information.
2.7.2.1 RESTARTING THE UPS
After the emergency situation that prompted use of the EPO switch has been resolved, the UPS can be
restarted as follows:
1. Reset the EPO switch.
2. Switch off the following circuit breakers: ac input, bypass ac input, battery.
3. Switch on the same circuit breakers: ac input, bypass ac input, battery.
4. Switch on the UPS (“Operation > Turn on/off > System on”).

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CENTRIC User Guide, rel. 3.4 9
3. OPERATING MODES
The Centric UPS functions to supply ac electrical power to your load.
The Centric has three possible modes of operation:
•Normal mode.
•Battery mode.
•Bypass mode.
3.1 Normal mode
The UPS is almost always in normal operation mode. The load receives its power from the inverters that
supply stabilized voltage, protected from spikes and irregularities in the ac input. The ac input system feeds
the charger which supplies dc power to the inverter, while concurrently charging the batteries.
3.2 Battery mode
During battery operation, the load continues to receive power from the inverters, but the dc input to the
inverter is taken from the batteries, instead of from the rectifier.
The batteries are galvanically connected by dc link to the inverter and the charger. Therefore, the dc
voltage to the inverter continues without interruption when the ac input supply drops out; there is no need
for any switching devices to bring the battery on-line, as it is permanently on-line.
The duration of the battery operation is determined by the load demand and the battery capacity.
3.3 Bypass mode
During bypass operation, the load receives power directly from the bypass ac input via the static switch.
Whenever the inverters cannot provide power to the load, either due to an overload or a short-circuit in the
load, the load is automatically moved to the bypass ac input. The load automatically returns to the inverter
when the problem has been corrected.

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10 CENTRIC User Guide, rel. 3.4
4. USER INTERFACE
This section describes the buttons and indicators used to operate the Centric.
4.1 Control panel
The LCD control panel (Figure 3) is the user's main interface with the Centric. The LCD panel is touch-
sensitive – the user navigates through the system screens by pressing lightly on the various icons. On all
screens other than the main menu screen, the current navigation path is displayed in the upper-left corner
of the screen (Figure 4), enabling you to easily understand where you are within the control system menus.
The navigation path in the upper-left corner of the screen is also used to navigate backwards – to return to
a previous screen or to the main menu.
The extensive capabilities of the user interface are described in detail in chapter 7 "Centric menu functions
in detail".
Figure 5: The control panel, displaying the Main Screen
The LCD control panel is attached to the front of the UPS and is active when the UPS is connected to ac
power and also when the UPS is operating in battery mode.
There is a physical power on/off button on the control panel that controls the power supply to the screen. If
the UPS is connected to ac power or operating in battery mode and the display screen is blank, ensure that
the display unit itself has been powered on.
The display unit is mounted on a holder and can be removed from that holder if necessary. The angle of the
display screen can be adjusted.
4.1.1 Calibrating the touch screen
It may occasionally be necessary to calibrate the touch-screen, so that the pressure sensitive spots on the
screen accurately overlay the icons. It is recommended to calibrate the touch-screen the first time you use
it. The touch-screen can be recalibrated at any time, if needed.
To calibrate the touch screen:
1. Navigate to the Main Screen (the calibration can be performed only from the Main Screen).
2. Press and hold your finger on any location on the screen (preferably not on an icon) for 10 seconds
and then release your finger.
3. The software then prompts you to press on four specific locations on the screen, one after the other.
Upon completing this process, the touch screen has been calibrated.

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4.2 Buttons and LEDs on the system controller
On the system controller, to the left of the LCD touch screen are two buttons, and two LEDs These are
described below.
4.2.1 “UPS off” button
Pressing the ‘UPS off” button for ten seconds turns the Centric OFF.
This button is intended for use only when the LCD screen is not functional. Under normal circumstances
the on/off button icon in the upper right corner of the touch screen should be used to switch the UPS off.
Note: disabling the controller self-shutdown function (watchdog function) also disables the
“UPS OFF” button. See section 7.2.1.6.3 for more information.
4.2.2 “Alarm” LED
The “Alarm” LED lights when there is an alarm situation present. This LED is the physical counterpart of the
software generated triangular “alarm” indicator on the LCD panel’s main screen.
The Alarm LED has 3 possible states:
Off (unlit) There are no active system alarms.
Blinking red There are one or more active alarms. To see a list of the active alarms, press the yellow
triangular alarm indicator on the LCD panel’s main screen.
Solid red There are active alarms, but you have listed them already on the LCD screen. When a
fresh alarm occurs, the Alarm LED will start blinking again.
For more information on system alarms, see “Alarm indicator” in Table 2, and refer to
chapter 10 “Troubleshooting”.
4.2.3 “CPU active” LED
The “CPU active” LED is normally a solid green. If this LED is not lit (a very rare occurrence), the CPU has
stopped operating. Using the “CPU On/Off” button may resolve the problem. See section 4.2.4.
4.2.4 “CPU On/Off” button
Pressing the “CPU On/Off” button switches the UPS’s main computer (the CPU) off or on. This is for use
only in the rare instance that the LCD touch screen freezes up or the system otherwise ceases to respond
to commands. In such a case, switching the CPU off and then on again may resolve the problem.

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The Centric will continue to operate as normal even when the computer is turned off, although obviously
there will be reduced functionality.
4.3 Fallback push-button control panel
In the unlikely event that the LCD display panel stops functioning due to damage or for some other reason,
it is still possible to operate the Centric via a push-button control panel located on the static switch, on
Centric’s lower front panel
Figure 6: Location of fallback push-button control panel
The push-button panel provides only the most basic functionality.
1. When the Centric is OFF, pressing the "Enable" button turns the Centric ON.
(The button is recessed to prevent accidental use.)
2. The "Inv/Byp" button toggles the load from bypass to the inverter and from the inverter to bypass.
3. Pressing the "UPS Off" button for ten seconds turns the Centric OFF. The “UPS Off” button is
located on the top front of the Centric, to the left of the LCD touch screen.
To reiterate, the fallback control panel is intended for use only when the LCD screen is not functional.
Figure 7: Close-up of the push-button control panel