GE Digital Energy LP 31 Series Technical specifications

GE Consumer & Industrial
Power Protection
Product Description
Digital Energy™ Uninterruptible Power Supply
LP 31 Series / 8 – 10 – 15 – 20 kVA
400 VAC CE / Series 1
Manufactured by:
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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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
Model: LP 31 Series / 8 – 10 – 15 - 20 kVA / Series 1
Date of issue: 01.10.2005
File name: PRD_LPS_31E_8K0_20K_1GB_V021
Revision: 2.1
Up-dating
Revision Concerns Date
2.0 GE House-style 15.03.2005
2.1 GE Consumer & Industrial SA 01.10.2005
Table of contents Page
1. INTRODUCTION .............................................................................................................................................. 3
2. FUNCTIONAL EXPLANATION......................................................................................................................... 3
2.1 Principles of Operation..........................................................................................................................................................................3
2.2 Normal Conditions..................................................................................................................................................................................4
2.3 Mains Failure .............................................................................................................................................................................................4
2.4 Bypass operation ....................................................................................................................................................................................5
3. EXTERNAL DESCRIPTION............................................................................................................................... 6
3.1 Front and Rear Panel.............................................................................................................................................................................6
3.2 The LCD screen.........................................................................................................................................................................................6
3.3 Alarm Conditions .....................................................................................................................................................................................7
4. STANDARD FEATURES ................................................................................................................................... 8
5. INTERFACING .................................................................................................................................................. 9
5.1 ComConnect (RS232 Interface).........................................................................................................................................................9
5.2 Potential Free Contact Interface ................................................................................................................................................... 10
5.3 SNMP Interface (optional) ................................................................................................................................................................. 10
6. OPTIONS......................................................................................................................................................... 10
6.1 SNMP Interface Card........................................................................................................................................................................... 10
6.2 Alarm Boxes............................................................................................................................................................................................ 10
6.3 Connectivity Products........................................................................................................................................................................ 10
6.4 Battery Extension Packs ................................................................................................................................................................... 10
COPYRIGHT © 2005 by GE Consumer & Industrial
Data subject to change without prior notice.
All brands and product names are Trademarks or Registered Trademarks of their respective owners.
Reproduction only upon written consent by GE.

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
1. INTRODUCTION
The LP 31 Series / 8 – 10 – 15 - 20 kVA UPS series is a compact, truly On-line 3-phase in 1-phase out
system which incorporates the most advanced power electronics technology to provide exceptional
protection for electrical equipment.
2. FUNCTIONAL EXPLANATION
2.1 Principles of Operation
The UPS stores electric energy in batteries housed in the unit.
This allows the system to supply output power even when the incoming mains power is cut off
completely.
Energy is stored as Direct Current (DC), but input and output energy must be Alternating Current (AC) in
sine wave form.
The UPS therefore contains an input converter (AC to DC) and an output converter (DC to AC) (Figure 1).
The LP 31 Series / 8 – 10 – 15 - 20 kVA UPS is a SECOND GENERATION On-line UPS with:
• battery not in line with the DC link, resulting in:
- enhanced battery life;
- optimal battery charging;
• full wave input converter with power factor correction;
• extremely wide input voltage and input frequency tolerance;
• output converter (inverter) using IGBT technology.
Figure 1 - Block diagram of the LP 31 Series / 8-10-15-20 kVA UPS, mains present
The UPS needs two separate mains:
One three phase + neutral input mains and a single phase bypass mains. The neutral is essential.

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
2.2 Normal Conditions
Under normal input conditions (see section 4.2) energy from the mains is channelled through the input
converter, which supplies the output converter and, together with the battery charger, keeps the
battery fully charged.
Surges and spikes are blocked completely at the input converter and very unstable mains can be
supported.
The output converter synthesises a completely new AC output sine wave to supply the load (electrical
equipment).
2.3 Mains Failure
In the event of a mains power failure (i.e. absent or outside tolerance) the output converter uses the
energy reserve stored in the battery to continue to produce AC power, ensuring unbroken output
Figure 2 - Block diagram of the LP 31 Series / 8-10-15-20 kVA UPS, mains failure
No interruption or alteration will ever be noticed in the output power.
In the event of an extended mains failure, the output converter will stop when the battery energy has
been used up.
At this point, the UPS is no longer able to power the connected equipment.
When the mains is re-established within tolerance, the output converter will be supplied again by the
input converter and the batteries will be recharged, making them ready to support future power
failures.

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
2.4 Bypass operation
The static switch provides transfer of the load to the line voltage without any interruption of the supply.
The transfer is initiated by a signal from the output converter protection circuit in case of an overload,
high temperature or output converter failure.
When the conditions return to normal the load is automatically transferred back to the output converter.
If the output converter is unable to deliver the demanded output power (overload, overtemperature) the
bypass switch will automatically transfer the load to the mains.
If bypass operation is caused by an overload situation, the UPS will switch back to output converter if
the load is reduced to less than 100%.
If bypass operation is caused by overtemperature, the unit will only switch back when the temperature
has dropped below alarm level.
When the normal situation is restored, the load will be transferred back to the output converter.
Figure 3 - Bypass operation
If a power failure occurs during bypass operation, load power is lost.
If the UPS functions under overload conditions it may not be able to protect the load.

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
3. EXTERNAL DESCRIPTION
3.1 Front and Rear Panel
Figure 4 - Front and rear panel LP 31 Series / 8-10-15-20 kVA UPS
FRONT REAR
Operation/Alarm : green/red LED Interfaces: - ComConnect (RS232)
LCD screen: 2 x 16 characters - Potentialfree contacts
Push-buttons: down/enter-reset/up - CardConnect slot
Buzzer (resettable) Manual bypass switch
Inverter on/off switch Input/Output terminals
Mains fuse
Bypass fuse
3.2 The LCD screen
The LCD screen shows UPS system data, status messages, alarm messages, settings.
Six types of screens can be displayed:
- the default screen;
- information screens;
- setup screens;
- service screens;
- test screens.

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
The ‘default screen’ shows UPS model and actual load (values are examples):
LP 15-31
LOAD 37%
The 'information screens' show the UPSs system data:
- Mains voltage, mains frequency and the power delivered by the mains.
- Output voltage and output frequency, and the power delivered by the UPS.
- Power factor, crest factor and peak currents of the connected equipment.
- Temperature near the batteries, battery voltage and battery (dis)charging current.
- Remaining autonomy time (during mains failure).
- The total operating time of the UPS
The 'setup screens' show a programmable UPS function and its actual setting:
- System operating frequency.
- System operating voltage.
- Battery capacity.
- No-load shutdown (<2%).
- Bypass enable/disable.
- Frequency tracking range.
The 'service screens' show service information targeted on trained service personnel:
- Serial number of the UPS, release number of the installed software.
- Service information on internal components, fan speed, internal DC voltage, internal temperature
levels, peak input voltage, mean (bypass) input voltage, mean output voltage.
- Start of a quick battery test.
- Forced (manual) transfer to bypass.
The 'test screens' show the proceeding of the following tests:
- General system test.
- Quick battery test.
- Battery calibration test.
- Bypass test.
3.3 Alarm Conditions
The LCD screen on the front panel displays status messages and alarm messages.
Three kinds of messages can be recognized.
- Status indications indicate the UPS operating mode.
- Low priority alarms indicate abnormal operating situations; the screen message is accompanied by
a 1x per sec. blinking red LED and a 1x per 8 seconds. sounding buzzer, resettable.
- High priority alarms indicate situations in which the connected load is at risk as a proper
output voltage of the UPS is no longer guaranteed; immediate action
should be taken.
The screen message is accompanied by a 1x per sec. blinking red
LED 'alarm' and a 1x per second sounding buzzer, resettable.
Note: By using ComConnect, additional conditions can be monitored and signals include written screen
messages (see section 5, Interfacing).

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
4. STANDARD FEATURES
Automatic (quick) battery test
The LP Series family UPS conducts periodic automatic battery tests to ensure that the batteries and the
wiring are healthy and able to support power failures.
The tests do not cause any interruption in the function of the unit.
Automatic tests are conducted after every 500 operating hours.
A manual battery test can be activated either through an interface kit via the ComConnect Port, or via the
front panel.
Deep battery calibration test
The battery condition can be calibrated by the UPS monitoring software, ensuring accurate autonomy
prediction.
Please refer to the manual of the appropriate monitoring software package for more information.
During a deep battery test the batteries will be discharged until 'battery low' alarm level.
The test will, after a complete recharge, result in new autonomy predictions.
Communications port
ComConnect: 9-pin Sub-D male plug
No-load shutdown
Whenever the load is <2% of the maximum load, and the input is absent for a period exceeding 10
minutes.
If the input voltage is restored, the output will be available again. Standard: activated.
Bypass enable/disable
If you do not want the automatic bypass switch to transfer to bypass, e.g. in situations of very bad or
unstable mains, the bypass switch can be disabled.
Also if the unit is used as a frequency converter the bypass transfer must be disabled and the control knob
of the manual bypass switch must be removed.
Frequency tracking range
The output frequency will follow the bypass frequency within the frequency tracking range (standard ±
2%).
If the bypass frequency is outside these limits, the inverter will run on its internal oscillator, and bypass
transfer is inhibited.
If you want the bypass switch to operate over a wider frequency range (e.g. in case of generator supply),
the tracking range can be changed into ± 4% or ± 6%.

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
5. INTERFACING
5.1 ComConnect (RS232 Interface)
Located at the back of the unit, the ComConnect is a plug-in interface port (9-pin, Sub-D, male), which
enables advanced communication between the UPS and the computer (interface kit required).
The microprocessor controlled and galvanically isolated ComConnect sends information concerning
power levels and UPS condition to the computer or network interface.
In the event that batteries are near exhaustion, it sends commands for unattended controlled shutdown
of computer systems.
The ComConnect can also receive UPS shutdown signals from computers or network interface.
When signals are sent to the computer, a written message can appear on the screen to inform the user.
Monitored conditions include:
•mains voltage availability;
•discharge level of batteries;
•temperature of the batteries;
•interactive control- and diagnostic information for stand-alone and network systems.
Interface kits (cables and software) are available for most commonly used network operating systems,
including Novell, UNIX, VMS, Banyan Vines, Windows 3/95/98/NT, Apple, IBM LANserver, IBM AS/400.
Remote servicing through a modem (external) is possible with GE Victron SerVICe Software.
We strongly recommend to use only original GE software products in combination with the
ComConnect interface port.
We only guarantee proper operation of original GE products.
The ComConnect cable should be shielded, connect the cable shield to the computer cabinet only.
For specific information on GE 's connectivity products please contact your dealer.
Figure 6 - ComConnect port
No. pin function:
1 RS232 input (UPS shutdown)
2 RS232 output
4 Windows’95 Plug&Play
5 Common
The ComConnect Port conforms to EN 50091 and is independent of the UPS function.

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PRD_LPS_31E_8K0_20K_1GB_V021.doc Product Description LP 31 Series
5.2 Potential Free Contact Interface
Four potential free change-over contacts are available for signalling the following alarms to a user
defined system:
•bypass active;
•mains failure;
•battery low;
•general alarm.
Capacity of the relay contacts: Nom: 48V 500mA
Min: 5V 100mA
5.3 SNMP Interface (optional)
The optional SNMP plug-in card allows the data interface to be connected directly to an Ethernet
network.
6. OPTIONS
6.1 SNMP Interface Card
An SNMP interface card can be placed in the CardConnect slot at the rear panel of the UPS, and allows the
data interface to be connected directly to an Ethernet network.
When this option is installed the ComProt communication link is no longer available to the user.
6.2 Alarm Boxes
An interface box linked to the ComConnect port, the VIC/RELAYBOX/01 translates the ComConnect signals
to five independent changeover contacts, with a maximum switching capacity of 230V/5A each.
Wall mounted plastic alarm boxes are available for remote audible and visual alarm indication.
6.3 Connectivity Products
A splitter box translates information from the ComConnect to several computers.
Interface kits (cables and software) are available for UPS communication with most commonly used
network operating systems, including Novell, UNIX, VMS, Banyan Vines, Windows 3-95-98-NT, Apple,
3COM, IBM LANserver, IBM AS/400.
Please contact your dealer for specific information.
6.4 Battery Extension Packs
Extended run-time versions are equipped with additional batteries to increase the autonomy time of the
unit.
These additional batteries are housed in a separate battery cabinet and are connected in parallel.
Additional batteries will increase the recharging time for the unit.