From Manual Bypass Q2 To Normal Function Vfi - GE LP 33U Series Operating Manual

7.2.3 From Manual Bypass Q2 to normal function VFI

This procedure presupposes that the load is powered by all manual bypass Q2 switch of the Parallel
System, and:
• The inverter is switched OFF;
• The manual bypass switch Q2 is closed (Pos. I);
• The output switch Q1 is open (Pos. 0);
• The Battery Breaker Q3 from all cabinets are OFF.
• LED Alarm blinks.
The synoptic diagram, on all UPS units, must display the status
"LOAD SUPPLIED BY MANUAL BYPASS Q2".
1. Close the output switch Q1 (Pos. I) on all UPS units.
When the last Q1 will be closed the output will be from utility in parallel from automatic bypass and manual
bypass Q2 of all UPS units.
The synoptic diagram, on all UPS units, must display the status
"LOAD SUPPLIED BY AUTOMATIC BYPASS AND MANUAL BYPASS
Q2".
2. Only in case it has been previously activated, restore the
command "Total Off"
the screen: COMMANDS/RESET TOTAL OFF
3. Open the manual bypass switch Q2 (Pos. 0) on all UPS units.
The load is supplied by the utility through the automatic bypass.
Verify on all UPS units, selecting the screen METERING/BOOSTER/Vp
and Vn, that the booster voltage has reached about 215 Vdc.
4. Insert the inverter by pressing "Inverter ON" ( I ) key on first UPS unit.
In case of sufficient output power, the output will transfer to
Inverter.
LED Alarm turn Off and the LED Operation must be is lit.
The synoptic diagram, on first UPS unit, must display the status
"LOAD SUPPLIED BY INVERTER".
4. Switch "ON" battery breaker from battery cabinet.
5. Insert the inverter by pressing "Inverter ON" ( I ) key on all other UPS units.
Do not start the next inverter until the sequence of the previous one end.
As soon as the output power of the inverters is sufficient to supply the load, the output of the units with
running inverter will transfer to inverter.
LED Alarm turn Off and the LED Operation must be lit.
The synoptic diagram, on all UPS units, must display the status
"LOAD SUPPLIED BY INVERTER".
Modifications reserved
OPM_LPS_3UO_50K_60K_1US_V010.doc
on any one of the units
END OF PROCEDURE
Home\Commands
RESET TOTAL OFF
by entering
REQUEST TOTAL OFF
Home\Meter
f
L1
L2
L3
Vp
Vn
COMMANDS
BOOSTER
: 60.0 Hz
: 120 V
: 120 V
: 120 V
: 215 V
: 215 V
Page 57/65
Operating Manual LP 33U Series 30 & 40 kVA