GE Digital Energy LP 33 Series User manual

GE Digital Energy
Power Quality
LP 33 Series 60 - 80 kVA
LP 33 Series 100 - 120 kVA
LPS33_060-120_S2_UPS_GE_01
Operating Manual
Uninterruptible Power supply
Digital Energy™
LP 33 Series
60 – 80 – 100 – 120 kVA
400 Vac CE / Series 2
GE Consumer & Industrial SA
General Electric Company
CH – 6595 Riazzino (Locarno)
Switzerland
T +41 (0)91 / 850 51 51
F +41 (0)91 / 850 51 44
www.gedigitalenergy.com
GE imagination at work

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OPM_LPS_33E_60K_M12_2GB_V010.doc Operating Manual LP 33 Series 60-80-100-120 kVA / S2
Model: LP 33 Series 60 – 80 – 100 – 120 kVA / Series 2
Issued by: Product Document Department – Riazzino - CH
Date of issue: 30.01.2009
File name: OPM_LPS_33E_60K_M12_2GB_V010
Revision: 1.0
Identification No.
Up-dating
Revision Concerns Date
COPYRIGHT © 2009 by GE Consumer & Industrial SA
All rights reserved.
The information contained in this publication is intended solely for the purposes indicated.
The present publication and any other documentation supplied with the UPS system is not to be
reproduced, either in part or in its entirety, without the prior written consent of GE.
The illustrations and plans describing the equipment are intended as general reference only and are
not necessarily complete in every detail.
The content of this publication may be subject to modification without prior notice.

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Dear Customer,
We thank you for selecting our products
and are pleased to count you amongst
our very valued customers at GE.
We trust that the use of the LP 33 Series
Uninterruptible Power Supply system,
developed and produced to the highest
standards of quality, will give you
complete satisfaction.
Please read carefully the Operating
Manual, which contains all the necessary
information and describes all you need to
know about the use of the UPS.
Thank you for choosing GE !
Distributed by:
Your service contact:
g
GE Consumer & Industrial SA
General Electric Company
CH – 6595 Riazzino (Locarno)
Switzerland

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Table of contents Page
1SAFETY RULES ................................................................................................................................................. 6
1.1 IMPORTANT SAFETY RULES..................................................................................................................................................................7
1.2 SAFETY SYMBOLS AND WARNINGS............................................................................................................................................... 10
2LAYOUT........................................................................................................................................................... 11
2.1 LAYOUT LP 33 Series 60 - 80 KVA................................................................................................................................................... 11
2.2 LAYOUT LP 33 Series 100 - 120 KVA ............................................................................................................................................. 12
3INTRODUCTION ............................................................................................................................................ 13
3.1 GENERAL DESCRIPTION...................................................................................................................................................................... 13
4DESCRIPTION ................................................................................................................................................ 14
4.1 PRINCIPAL DIAGRAM AND MAIN ELEMENTS DESCRIPTION................................................................................................ 14
4.2 OPERATION MODES.............................................................................................................................................................................. 15
4.3 RPA PARALLEL SYSTEM ....................................................................................................................................................................... 18
4.4 UPS PARALLELED ON THE SAME BATTERY................................................................................................................................. 19
4.5 SERVICE AND TECHNICAL SUPPORT ............................................................................................................................................. 20
4.6 WARRANTY ............................................................................................................................................................................................... 20
4.7 RECYCLING AT THE END OF SERVICE LIFE.................................................................................................................................. 21
5INSTALLATION............................................................................................................................................... 22
5.1 TRANSPORT.............................................................................................................................................................................................. 22
5.1.1 Dimensions and weights.......................................................................................................................................................................... 23
5.2 DELIVERY ................................................................................................................................................................................................... 24
5.3 STORAGE.................................................................................................................................................................................................... 24
5.3.1 Storage of the UPS ...................................................................................................................................................................................... 24
5.3.2 Storage of the battery............................................................................................................................................................................... 25
5.4 PLACE OF INSTALLATION ................................................................................................................................................................... 26
5.5 VENTILATION AND COOLING............................................................................................................................................................ 29
5.6 UNPACKING.............................................................................................................................................................................................. 30
5.7 ELECTRICAL WIRING............................................................................................................................................................................. 32
5.7.1 Fuse discrimination (co-ordination of breakers tripping) .......................................................................................................... 33
5.7.2 Fuse ratings.................................................................................................................................................................................................... 34
5.7.3 Input / output cable ratings.................................................................................................................................................................... 35
5.7.4 Installation requirements......................................................................................................................................................................... 36
5.8 ELECTRICAL CONNECTION ................................................................................................................................................................ 37
5.8.1 LP 33 Series 60 kVA - Power connection with common input mains................................................................................... 39
5.8.2 LP 33 Series 80 kVA - Power connection with common input mains................................................................................... 40
5.8.3 LP 33 Series 100 - 120 kVA - Power connection with common input mains .................................................................... 41
5.8.4 LP 33 Series - 60 kVA - Power connection with separate input mains (option) ............................................................... 42
5.8.5 LP 33 Series 80 kVA - Power connection with separate input mains (option) .................................................................. 43
5.8.6 LP 33 Series 100 - 120 kVA - Power connection with separate input mains (option).................................................... 44
5.8.7 RPA Parallel System - Control bus connection............................................................................................................................... 45
5.9 UPS FUNCTIONING AS FREQUENCY CONVERTER ................................................................................................................... 48
6SYSTEM HANDLING ...................................................................................................................................... 49
6.1 CONTROL PANEL.................................................................................................................................................................................... 49
6.2 TABLE OF FUNCTIONS AND INDICATIONS ON CONTROL PANEL ..................................................................................... 50
6.3 COMMAND SWITCHES......................................................................................................................................................................... 52

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7LCD SCREEN .................................................................................................................................................. 53
7.1 HOME SCREEN ........................................................................................................................................................................................ 53
7.2 METERING ................................................................................................................................................................................................. 55
7.3 ALARMS...................................................................................................................................................................................................... 57
7.3.1 Events (alarms and messages).............................................................................................................................................................. 58
7.3.2 Alarms list........................................................................................................................................................................................................ 58
7.3.3 Messages list.................................................................................................................................................................................................. 61
7.3.4 Event report LP 33 Series.......................................................................................................................................................................... 63
7.4 SETUP.......................................................................................................................................................................................................... 64
7.5 COMMANDS ............................................................................................................................................................................................. 69
8OPERATION.................................................................................................................................................... 70
8.1 PROCEDURES FOR SINGLE LP 33 Series...................................................................................................................................... 70
8.1.1 Start-up of the LP 33 Series..................................................................................................................................................................... 70
8.1.2 UPS shutdown with load transfer on manual bypass Q2 ......................................................................................................... 74
8.1.3 From Manual Bypass Q2 to normal function VFI .......................................................................................................................... 76
8.1.4 Complete UPS shutdown.......................................................................................................................................................................... 77
8.1.5 Restore to normal operation after “Total Off”................................................................................................................................. 78
8.1.6 Restore to normal operation after “EPO – Emergency Power Off”........................................................................................ 79
8.2 PROCEDURES FOR PARALLEL SYSTEM LP 33 Series............................................................................................................... 80
8.2.1 LP 33 Series Parallel System start-up................................................................................................................................................. 80
8.2.2 Parallel UPS shutdown with load transfer on manual bypass Q2......................................................................................... 84
8.2.3 From Manual Bypass Q2 to normal function VFI .......................................................................................................................... 86
8.2.4 Separate a UPS unit from the Parallel System (System Redundancy)................................................................................ 87
8.2.5 Reconnect a UPS unit to a Parallel System...................................................................................................................................... 88
8.2.6 Complete Parallel System shutdown.................................................................................................................................................. 89
8.2.7 Restore to normal operation after “Total Off”................................................................................................................................. 90
8.2.8 Restore to normal operation after “EPO – Emergency Power Off”........................................................................................ 91
9CUSTOMER INTERFACE................................................................................................................................ 92
9.1 SERIAL PORT J27 - RS232 .................................................................................................................................................................. 93
9.2 RELAY CARD ............................................................................................................................................................................................. 94
9.3 EPO (EMERGENCY POWER OFF)....................................................................................................................................................... 95
10 OPTIONS......................................................................................................................................................... 96
10.1 OPTIONS GENERAL VIEW ................................................................................................................................................................... 96
10.2 OPTIONS ASSEMBLY AND CONNECTION .................................................................................................................................... 97
10.2.1 Customer Interface..................................................................................................................................................................................... 97
10.2.2 Optional battery cabinet connection ...............................................................................................................................................100
11 MAINTENANCE............................................................................................................................................101
11.1 GENERAL MAINTENANCE.................................................................................................................................................................101
11.2 COOLING FAN MAINTENANCE .......................................................................................................................................................101
11.3 OTHER COMPONENTS WITH LIMITED LIFETIME.....................................................................................................................101
11.4 BATTERY MAINTENANCE ..................................................................................................................................................................101
11.5 SERVICE REQUIRED.............................................................................................................................................................................101
12 NOTES...........................................................................................................................................................102
12.1 NOTES FORM..........................................................................................................................................................................................102
13 ANNEX ..........................................................................................................................................................103
13.1 TECHNICAL DATA SHEET ..................................................................................................................................................................103
13.2 UPS SCHEMATIC DIAGRAMS...........................................................................................................................................................103
13.3 CD-ROM ...................................................................................................................................................................................................103

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1 SAFETY RULES
With this document, GE gives to the user all the necessary information about the correct use of the UPS.
Please read carefully this Operating Manual before installing or operating the UPS.
We recommend that this manual be kept next to the UPS for future references.
If any problems are encountered with the procedures contained in this manual, please contact the
nearest Service Centre before you proceed.
All UPS installation, maintenance and service work should be performed by qualified service personnel
only.
The KNOWLEDGE and the FULLY compliance of the safety instructions and
the warning contained in this manual are
THE ONLY CONDITION
to avoid any dangerous situations during installation, operation,
maintenance work, and to preserve the maximum reliability of the UPS
system.
NOTE !
LP 33 Series 60 - 80 - 100 - 120 kVA is a Category C2 UPS Product
(Class A), according to IEC 62040).
Installation restrictions or additional measures may be needed
to prevent disturbances.
ATTENTION !
While every care has been taken to ensure the completeness
and accuracy of this manual, GE assumes no responsibility or
liability for any losses or damages resulting from the use of the
information contained in this document.
GE, refuses any responsibility in case of non-observance,
unauthorised alterations or improper use of the
delivered UPS.

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1.1 IMPORTANT SAFETY RULES
GENERAL
• Move the UPS in an upright position in its original package to the final destination room.
• To lift the cabinets, use a forklift or lifting belts with spreader bars.
• Check for sufficient floor and elevator loading capacity.
• Check carefully the integrity of the UPS equipment.
In case you note some visible damage, do not put the UPS under voltage, but contact the nearest
Service Centre.
• WARNING: RISK OF ELECTRICAL SHOCK.
Apart the front hinged lockable doors, do not remove any covers, there are no user serviceable
parts inside.
• After switching off takes 5 minutes for the DC capacitors to discharge because a lethally high
voltage remains at the terminals of the electrolytic capacitors.
• All maintenance and service work should be performed by qualified service personnel.
• The outlet-bars may be electrically live, even when the UPS is disconnected from the mains.
• Dangerous voltages may be present during battery operation.
• The battery protections must be removed before any maintenance or service work.
• Be aware that the inverter can restart automatically after the utility voltage is restored.
INSTALLATION
• This UPS must be installed and connected only by trained personnel.
• Verify accurately during Commissioning and Maintenance of the UPS, for the following:
Damaged components, squeezed wires and cables, or not correctly inserted plugs.
• After removing the sidewalls of the UPS, make sure that all earth connections when reassembling,
are correctly reattached.
• This UPS is intended for use in a controlled indoor environment free of conductive contaminants
and protected against animals intrusion.
• High earth leakage current: Earth connection essential before connecting to AC input.
• Switching OFF the unit does not isolate the UPS from the mains.
• Do not install the UPS in an excessively humid environment or near water.
• Avoid spilling liquids on or dropping any foreign object into the UPS.
• The unit must be placed in a sufficiently ventilated area; the ambient temperature should not
exceed 35°C (95°F).
• Optimal battery life is obtained if the ambient temperature does not exceed 25°C (77°F).
• It is important that air can move freely around and through the unit.
• Do not block the air vents.
• Avoid locations in direct sunlight or near heat sources.

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STORAGE
• Store the UPS in a dry location; storage temperature must be within -25°C to 55°C (-13°F to 131°F).
• If the unit is stored for a period exceeding 3 months, the batteries must be recharged periodically
(time depending on storage temperature).
BATTERY
• The battery-voltage is dangerous for person’s safety.
• When replacing the battery, use the same number, voltage (V) and capacity (Ah).
Do not connect battery strings of different type in parallel.
• Proper disposal or recycling of the battery is required.
Refer to your local codes for disposal requirements.
• Never dispose of battery in a fire: they may explode.
• Do not open or mutilate battery: their contents (electrolyte) may be extremely toxic.
If exposed to electrolyte, wash immediately with plenty of water.
• Avoid charging in a sealed container.
• Never short-circuit the batteries.
• When working with batteries, remove watches, rings or other metal objects, and only use insulated
tools.
WARNING !
The UPS contains hazardous voltages.
Observe carefully the safety instructions to prevent risk of
electrical shock.
Parallel version secured with RPA
When included in the text, this symbol refers to operation
needed only for Parallel System.

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Safety instructions when working with battery
EXTERNAL BATTERY MUST BE INSTALLED AND CONNECTED TO THE UPS BY
QUALIFIED SERVICE PERSONNEL.
INSTALLATION PERSONNEL MUST READ THIS ENTIRE SECTION BEFORE HANDLING
THE UPS AND BATTERY.
DANGER!
Full voltage and current are always present at the battery terminals.
The battery used in this system can provide dangerous voltages, extremely high currents and a
risk of electric shock.
If the terminals are shorted together or to ground they may cause severe injury.
You must be extremely careful to avoid electric shock and burns caused by contacting battery
terminals or shorting terminals during battery installation.
Do not touch uninsulated battery terminals.
A qualified service person, who is familiar with battery systems and required precautions, must
install and service the battery.
The installation must conform to national and local codes.
Keep unauthorised personnel away from the battery.
The qualified service person must take these precautions:
1 Wear protective clothing, such as rubber gloves and boots and protective eye wear
Batteries contain caustic acids and toxic materials and can rupture or leak if mistreated.
Remove rings and metal wristwatches or other metal objects and jewelry.
Do not carry metal objects in your pockets where the objects can fall into the battery
cabinet.
2 Tools must have insulated handles and must be insulated so that they will not short battery
terminals.
Do not allow a tool to short between individual or separate battery terminals or to the
cabinet or rack.
Do not lay tools or metal parts on top of the battery, and do not lay them where they could
fall onto the battery or into the cabinet.
3 Install the battery as shown on the drawing provided with the battery.
When connecting cables, never allow a cable to short across a battery’s terminals, the
string of battery, or to the cabinet or rack.
4 Align the cables on the battery terminals so that the cable lug will not contact any part of
the cabinet or rack, even if the battery is moved.
Keep the cable away from any sharp metal edges.
5 Install the battery cables in such a way that the UPS or battery cabinet doors cannot pinch
them.
6 Do not connect the battery terminal to Ground.
If any battery terminal is inadvertently grounded, remove the source of the ground.
Contacting any part of a grounded battery can cause a risk of electric shock.
7 To reduce the risk of fire or electric shock, install the battery in a temperature and humidity
controlled indoor area, free of contaminants.
8 Battery system chassis ground (earth) must be connected to the UPS chassis ground (earth).
If you use conduits, this ground conductor must be routed in the same conduit as the
battery conductors.
9 Where conductors may be exposed to physical damage, protect the conductors in
accordance with all applicable codes.
10 If you are replacing the battery or repairing battery connections, shut OFF the UPS and
remove the battery fuses.

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1.2 SAFETY SYMBOLS AND WARNINGS
Safety warnings
The text of this manual contains some warnings to avoid risk to the persons and to avoid damages to
the UPS system and the supplied critical loads.
The non-observance of the warnings reminding hazardous situations could result in human injury and
equipment damages.
Please pay attention to the meaning of the following warnings and symbols:
WARNING !
Referred to procedures or operations which could cause damages to the persons or
to the system, when not correctly operated.
NOTE !
Warns the user about important operations or procedures described in this manual.
Safety symbols
When the text includes one or more of the following symbols, that means exist a potentially hazardous
situations.
Please remind the meaning of each symbol.
CAUTION
Related to all the potentially hazardous situations which may result in injury.
DANGER OF PARTS ELECTRICALLY LIVE
Related to all the situation with potentially hazardous voltage.
DANGER OF EXPLOSION
Used to indicate conditions where exploding parts can cause serious injury.
DANGER OF CRUSHING
Used when moving the equipment due to the heavy weight.
DANGER OF OVERHUNG LOAD
Used when the equipment is lifted by a crane.
DANGER OF HOT SURFACE
Used to indicate conditions of elevated temperature on some parts.
DO NOT TOUCH
Risk of parts with hazardous voltages or parts in movement.

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2 LAYOUT
2.1 LAYOUT LP 33 Series 60 - 80 kVA
LPS33_060-080_S2_UPS_GE_01
Fig. 2.1-1 General view
LPS33_060-080_S2_UPS_02
OFF
ON
OFF
ON
Fig. 2.1-2 General view with open door
Fig. 2.1-4 Control panel
1 Opening for input and output of cables
CI Customer Interface Board (optional)
Q1 UPS output switch
Q2 Manual bypass switch
RC Relay card
RPA RPA board (optional)
SNMP Advanced SNMP Card (optional)
X1 Terminals for common mains inpu
t
connection (rectifier + bypass)
X2 Terminals for separate mains inpu
t
connection (optional)
X3 Terminals for load output connection
LPS33_060-080_UPS_03
OFF
ON
OFF
ON
SNMP
CI
RC
X11X2X3X4
RPA
Q2
Q1
Fig. 2.1-3 General view without protection panels X4 Terminals for external battery connection

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2.2 LAYOUT LP 33 Series 100 - 120 kVA
LPS33_100-120_S2_UPS_GE_01
Fig. 2.2-1 General view
LPS33_100-120_S2_UPS_02
Q2
ON
OFF
Q1
ON
OFF
Fig. 2.2-2 General view with open door
Fig. 2.2-4 Control panel
1 Opening for input and output of cables
CI Customer Interface Board (optional)
Q1 UPS output switch
Q2 Manual bypass switch
RC Relay card
RPA RPA board (optional)
SNMP Advanced SNMP Card (optional)
X1 Terminals for common mains inpu
t
connection (rectifier + bypass)
X2 Terminals for separate mains inpu
t
connection (optional)
X3 Terminals for load output connection
Q2
ON
OFF
Q1
ON
OFF
LPS33_100-120_UPS_03
SNMP
CI
RC
X1 1 X2 X3X4
RPA
Q2
Q1
Fig. 2.2-3 General view without protection panels X4 Terminals for external battery connection

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3 INTRODUCTION
3.1 GENERAL DESCRIPTION
The LP 33 Series Uninterruptible Power Supply (UPS) provides the energy supply for critical loads which
need a reliable, continuous free from voltage disturbances and frequency fluctuations supply.
In case the mains fails, or it exceeds the permitted tolerances, the energy to supply the load is furnished
by the battery with a backup time dependent on its capacity, until the mains recovers.
LP 33 Series is a truly VFI double conversion Uninterruptible Power Supply (UPS),
equipped with automatic bypass, where the load is normally supplied by the
inverter.
LP 33 Series can be configured, if chosen, for the ECO Mode permitting the
maximum energy saving.
The main typical performances of the LP 33 Series system are the following:
• VFI (Voltage Frequency Independent) double conversion technology to provide an excellent
quality power supply.
• Input power factor 0.98.
• Input current THD: Active IGBT Rectifier: <9%
Active IGBT Rectifier - Clean Input Module: <4.5% (<3.5% at 75% load)
• Automatic bypass and manual bypass to improve reliability and maintenance.
• Microprocessor controlled supervision.
• Dual AC inputs (optional).
• ECO Mode operation.
• Compact and agreeable design expressly conceived for “Office environment”.
• Low level acoustic sound, to avoid noise to the persons operating in the same environment.
• Multi-language LCD screen.
• Total battery management: SBM (Superior Battery Management)
• Wide rectifier input voltage tolerance: 323 ÷ 460 Vac (phase - phase).
• Wide rectifier input frequency tolerance: +/-10% (45 ÷ 55 for 50 Hz and 54 ÷ 66 for 60 Hz).
• RPA (Redundant Parallel Architecture) up to 4 units.
• GE Connectivity.
• Compliance with European standard IEC 62040.

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4 DESCRIPTION
4.1 PRINCIPAL DIAGRAM AND MAIN ELEMENTS DESCRIPTION
Fig. 4.1-1 UPS principal diagram
The Uninterruptible Power Supply System LP 33 Series can be divided into the following main elements:
Electronics
The UPS is designed with a microprocessor–controlled supervision and diagnostic system.
Communication between user and UPS is achieved by the front panel consisting of an LCD screen,
displaying the operation modes, the measurements and the events / alarms.
Rectifier – Active IGBT Rectifier
The Active IGBT Rectifier converts the 3-phase mains voltage into a controlled and regulated DC-voltage,
supplying the inverter and to charge the battery through the battery-charger.
Thanks to modulation strategy applied to IGBT bridge, the rectifier provides clean input power in terms
of low THDi and unity power factor. For this purpose the UPS’s are offered in two configurations
depending on the required harmonic content (THDi): - Active IGBT Rectifier
- Active IGBT Rectifier - Clean Input Module
Both configurations provide clean input current at full and partial loads, avoiding thus possible
interference with other upstream equipment.
Inverter
The inverter converts the DC voltage into a three-phase sinusoidal with constant amplitude and
frequency, which is completely independent from the AC-input voltage.
Automatic Bypass
The automatic bypass consists of a static semiconductor-switch (SSR: Static Switch Relay), used to
provide an uninterrupted transfer of the load from inverter to mains when operating in VFI (Voltage
Frequency Independent) Mode.
If chosen the ECO Mode, the SSM transfer the load from mains to inverter in case the utility fails.
Back-Feed Protection
All LP 33 Series UPS’s are equipped with an automatic system for the protection against voltage back
feeding towards Utility, through the Bypass (Applied Standard IEC 62040-1).
This protection works automatically by opening contactor K6 (in series with the thyristors of the static
switch) and eventually K7, and acts in case of internal defects of the system, or due to wrong
manipulations on the maintenance bypass Q2.
Manual Bypass
The manual bypass consists of a pair of manual switches Q1 and Q2, which allow the isolation of the
UPS from the load, while still supplying the load with power directly from the mains.
Battery
The battery, normally stored by the battery-charger, supplies the DC energy to inverter in the event of
mains failure.

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4.2 OPERATION MODES
This section describes the different possible operation modes of the UPS explaining the function of the
main modules of the UPS.
VFI (Voltage Frequency Independent) mode operation
Under normal conditions the load is
permanently powered by the inverter with
constant amplitude and frequency.
The rectifier, powered by the mains, supplies
the inverter and the battery-charger keeps the
battery fully charged.
Fig. 4.2-1 Energy flow in VFI Mode operation
The inverter converts the DC voltage in a new AC sine wave voltage with constant amplitude and
frequency independently from the input mains power.
ECO Mode operation
When the ECO Mode is selected, and the mains
power is available, the load is normally
powered through the automatic bypass.
When the mains voltage is detected out of the
prescribed tolerances, the load is automatically
transferred to the inverter.
When the mains recovers, the load returns to
the automatic bypass after a variable time
defined by the control unit.
Fig. 4.2-2 Energy flow in ECO Mode operation
The ECO Mode can be configured directly by the user for higher efficiency, considering the mains
reliability and criticality of the load.
The selection between the two operation modes “VFI Mode and ECO Mode”, or switching between
operation modes at required time, can be done through the UPS control panel (see Section 7.4 – ECO
Mode).
In case of Parallel System
ECO Mode cannot be enabled for RPA Parallel System.
Attention: A single unit equipped with a RPA - Parallel board, must be considered as parallel, thus
disabling ECO Mode.

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Automatic bypass operation
In VFI (Voltage Frequency Independent)
operation mode, the load is permanently
supplied by the inverter but, in case of trouble
on the inverter, or when overload or short-
circuit on the output occur, if the mains
voltage do not exceed the admitted tolerances,
the load is instantly transferred to the mains
through the automatic bypass, taking
advantage of the higher short circuit power.
Fig. 4.2-3 Energy flow in automatic bypass operation
When the inverter recovers, the load will be re-transferred automatically to the inverter.
In case of Parallel System
Each unit has its own bypass.
All the bypasses in the system work together, their control being managed in the same manner by
all units.
The units are continuously exchanging information before taking such decision.
In case the inverter of one unit fails, its bypass remains operating.
It is excluded only if the unit is separated from the common bus by opening its output switch Q1.
Mains recovery operation
As soon as the mains recovers, the rectifier
starts up automatically supplying the inverter
and the battery-charger recharges the
battery.
In case the inverter has been shut down
following a complete discharge of the battery,
when the mains recovers the system start up
automatically.
Fig. 4.2-4 Energy flow at mains recovery operation
When the energy stored in the battery is sufficient to ensure a minimum time of operation with the
actual load, in case of a future mains failure, the load will be retransfered to inverter (if selected VFI
Mode).
In case of Parallel System
When the AC input power recovers, the rectifiers will start up sequentially according to their
number in the Parallel System in order to avoid an initial inrush current.
The inverters will start up automatically, but only when the battery has recharged enough for a
minimum runtime with the present load.
When enough inverters to supply the load have been restarted, the load will be transferred from the
automatic bypass back to the inverter bus-bars.

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Manual bypass operation
The manual bypass circuit consisting of Q1 and
Q2 manual switches, permits the transfer of the
load directly to the mains without interruption,
leaving the UPS galvanically separated from the
output load.
This type of operation is normally used when the
UPS system must be completely turned off for
maintenance or reparation.
Fig. 4.2-5 Energy flow in manual bypass operation
Mains failure operation
In the event of a mains power failure, the
rectifier and the battery-charger turn OFF, while
the inverter continues to supply the load
without interruption using the energy stored in
the battery.
During the battery discharge, the LCD screen
displays the remaining autonomy, based on the
battery capacity and the applied load.
Fig. 4.2-6 Energy flow during mains failure operation
In the event of an extended mains failure, before the battery is fully discharged, the alarm “stop
operation” warns the user that the UPS will start the shutdown procedures when the indicated time
expired (normally 3 minutes).
In case of Parallel System
With Parallel System for power capacity:
• With the bypass mains power available as the warning “battery low” occurs on one unit, after
timeout (selectable) the load is transferred to mains.
• With missing bypass mains power as the warning occurs on one unit, the system starts the
timeout (selectable) of “Stop operation” and then the output load shuts down.
With redundant Parallel System:
• As the warning battery low occurs on one unit unnecessary to support the present load, after
timeout (selectable) this unit shuts down and the load is shared between the other units.
As the warning occurs on one unit necessary to support the present load, the system starts the
timeout (selectable) of “stop operation” and then the output load shuts down.

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OPM_LPS_33E_60K_M12_2GB_V010.doc Operating Manual LP 33 Series 60-80-100-120 kVA / S2
4.3 RPA PARALLEL SYSTEM
The RPA (Redundant Parallel Architecture) allows to extend the unit to a Parallel System with 2, 3, or 4
units LP 33 Series connected on the same bus, which ensure the highest reliability rate and increase the
power availability.
Parallel System for power capacity
Two or more units can be paralleled in order to
achieve output power superior to the maximum
power delivered by a single UPS unit.
The maximum total load shared between the n
parallel units can achieve the 100% of the
installed nominal power system.
In the event of one unit fails, the load will be
suddenly transferred to the mains by the
bypass.
Parallel System for redundancy
The Parallel System can be defined redundant
only in case the nominal power rating of n-1
units of nparallel units is sufficient to supply the
required load power.
The load in a parallel redundant system, is
equally shared by nunits connected on the
output bars.
Mains Input
LPS33_060-080_S2_RPA system_GE_01
LP 33 Series
1
LP 33 Series
2
LP 33 Series
3
LP 33 Series
4
RPA
Board
RPA
Board
RPA
Board
RPA
Board
F2F1 F3 F4
Inverter TotalOff
g
Inverter Total Off
g
Inverter TotalOff
g
Inverter TotalOf f
g
Load
Fig. 4.3-1 RPA system diagram
Should one of the parallel units trip off-line, the remaining (n-1) units will share the load maintaining the
applications protected by inverter until the normal situation restores.
Load sharing between parallel units
The control bus exchanging the data between the microprocessors of the paralleled units provide for a
constant proportional load sharing in every load condition.
Management and synchronisation of the Parallel System
All the units are identical without master and slaves.
One unit is arbitrarily selected as the reference (the first unit connected on power bus) being this unit the
first synchronised with the mains voltage, and all the other units synchronise with the first one.
In case the reference unit fails or it is excluded from the parallel power bus any other unit will take over
the reference role.
The AC input power source of all the bypasses must be the same for all the units of the Parallel System
excluding any phase shift between them.
Control bus of the Parallel System
A high-speed serial bus, guarantees communication, synchronization and load sharing between the
UPS modules.
Each module controls it’s own function, while the Master (each unit can be Master) controls and
commands the status of the system.
NOTE !
No transformers, fuses or automatic circuit breakers should be inserted between
the unit’s output and the load common bus-bars.

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4.4 UPS PARALLELED ON THE SAME BATTERY
NOTE !
A Parallel System with a Common Battery for two or more UPS, requires a particular
installation and adequate setting of some parameters, (accessible only through
password), and can therefore only be done by a qualified GE engineer.
Usually each UPS Unit runs with its own Battery.
In case of parallel units running with a Common Battery (max. 4 UPS - see Fig. 4.4-1), the sharing circuit
between the individual UPS is integrated in the communication bus of the system in order to assure an
equal sharing of the Rectifiers output currents.
Fig. 4.4-1 Diagram RPA system with UPS on common battery
1 –
2 –
3 –
4 –
5 –
6 –
7 –
8 –
Rectifier
Inverter
Automatic Bypass
Manual Bypass
Mains Power
Load Bus Bar
External Battery Fuse
Battery
Pay attention to the following recommendations:
• The units delivered for this functioning mode needs a special parameters setting, so they must be
prepared in advance before the installation.
• The installation must be performed only with the UPS system completely shut down.
• The AC Rectifiers input power (5) must be the same, with clockwise phase rotation for each unit.
• Each Rectifier must be set for the same floating DC voltage and the same Battery current limitation.
• It is mandatory to install the fuses / MCB (7) on each line connecting the Rectifiers to the common
Battery for maintenance / safety reasons (see Section 5.7.2).
• In case a unit must be powered down for maintenance, switch-OFF the concerned unit before open
the DC fuses / MCB on the Battery line (7).
• It is recommended to connect an external NO free contact “Battery Fuses” to the UPS and to enable
the function by setting the parameter (see Section 9.1).
• If an emergency generator set supplies the UPS, and the free contact “Generator ON” is connected
to the Customer Interface, connect a separate NO free contact on each parallel unit.
• The parameters enabling the Battery test, both manual and automatic, must be set in the same
mode on all the units sharing a Common Battery.
• Do not connect the temperature sensor for automatic battery floating voltage compensation.
• Do not enable the function Boost charge.

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4.5 SERVICE AND TECHNICAL SUPPORT
For any request of technical support please
contact your local Service Centre.
Stamp of your local Service Centre (see page 3)


kVAOutput Power at Pow. factor
Output Freq. Hz
Output Voltage VAC: 3W + N + PE
Output Current A
lag.Series Product. Year
Input Freq. Hz
Input Voltage VAC: 3W + N + PE
Input Current A
Serial Nr.
Model
gGE Digital Energy
6595 RIAZZINO (CH)
MADE IN SWITZERLAND
OFF
ON
OFF
ON
Q2
ON
OFF
Q1
ON
OFF
LPS33_060-120_S2_Labelidentification_GE_01
LP 33 Series 60 - 80 kVA LP 33 Series 100 - 120 kVA
Fig. 4.5-1 Identification label
The requested data permitting to identify
your UPS are marked on the identification
label fixed on the front of the cabinet, behind
the lower front door.
For fast and efficient Technical Support
solutions, please mention the data marked on
the identification label.
4.6 WARRANTY
GE, operating through its authorised agents, warrants that the standard products will be free of defects
in materials and workmanship for a period of 24 months (12 months for battery), after the date of the
invoice, or such other period as may be specified.
NOTE !
This warranty does not cover failures of the product which result from incorrect
installation, misuse, alterations by persons other than authorised agents, or
abnormal working conditions.