GE Industrial Solutions LP11 924 Series 6 & 10 kVA - Manual (Page 42)

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OPM_LPU_11U_6K0_10K_1US_V010.Doc 41 User manual LP11 924 6 & 10 kVA UPS 1.0
5.6 - OTHER FEATURES
5.6.1 - SHUTDOWN
'Remote shutdown' : Using communication capabilities, the computer can direct the UPS to turn itself off following
controlled shutdown of the system. Subsequently the UPS will remain off for at least a few seconds (see also 6.1). LED
'operation' will blink green. The unit will start up again as soon as the utility returns.
'No-load shutdown' : The UPS will also switch off if the load is < 2% of the maximum load, and the input is absent for more
than 10 minutes. For more information see section 5.4.2, message 'SHUTDOWN ALARM'.
NOTE: If the UPS operates in parallel, the no-load function is not available.
'Emergency shutdown' : for more information see section 5.4.2, message 'IMMEDIATE SHUTDOWN'.
5.6.2 - UTILITY START
The UPS is able to start, even if the batteries are not connected. Alarm messages 'BATTERY FUSE FAILURE' and 'BATTERY
DEPLETED' will be shown. The run time is zero.
5.6.3 - SLEEP AND WAKE-UP
GE Digital Energy UPS monitoring software allows you to program a 'sleep period' of the UPS by sending two commands
to the UPS:
- shut down after # minutes, and subsequently:
- shut down during # hours.
After the first command the following screen appears:
During the sleep period the output voltage is no longer available. LED 'operation'
blinks green, and the LCD screen shows the time left until restart:
PROG. SHUTDOWN
WITHIN 0:09:17
PROG. SHUTDOWN
LEFT 0:14:03
If a utility failure occurs during the sleep period and the battery voltage eventually
drops below 200Vdc, the UPS will automatically switch off in order to save battery
power. When the main returns the UPS will start up automatically. The programmed
sleep time however is lost.
The sleep period can be cancelled by either turning the UPS ON/OFF switch (6) off for a
few seconds or by sending the appropriate command via the RS232/SNMP port.
5.6.4 - OVERLOAD PROTECTION IN BYPASS MODE
The UPS will protect itself in case of overload. Upon an overload which is caused by abnormal circumstances the UPS will
switch to bypass operation, and subsequently the bypass input fuse on the rear panel will trip. The capacity of the bypass
fuse allows it to handle the inrush currents of the equipment connected to the UPS. The fuse will only trip after more than
an hour at a bypass current of 40Amp (6kVA) or 63Amp (10kVA).
In order to protect the UPS system the software will cut off the abnormal current:
in 10 minutes: in 1 minute:
6kVA: 36Amp 49Amp
10kVA: 70Amp 81Amp
Between 36-49Amp (6kVA) 70-81Amp (10kVA) the time is inversely proportional to the input current. We advise to place a
distribution fuse slow blow type between UPS input and the utility supply. Please refer to the installation drawing in the
appendix.