Powertronix Quasar Service Manual page 69

Service Manual
5.
6.
7.
8.
9.
10.
11.
12.
WARNING
THE DC BUS VOLTAGE OF 750VDC MAY TAKE SEVERAL MINUTES TO DISCHARGE TO A
SAFE LEVEL.
13.
RETURN FROM MANUAL BYPASS TO NORMAL OPERATION
The following procedure describe how to start the ups and transfer the load from the maintenance by
pass to the ups inverter.
1.
2.
3.
4.
5.
6.
7.
The UPS is now in the normal operating condition with the Inverter supplying the load.
3x3 UPS Maintenance
Issue 2 - November 2001
D The Yellow `BYPASS ON' LED ( 4 ) will illuminate.
D The Green `NORMAL' LED will extinguish.
D The LCD will display the following messages:
`LOAD ON BYPASS' and
`INVERTER OFF'.
Remove the Mechanical Lock from the MANUAL BYPASS MCB ( I3 )
Close the. MANUAL BYPASS MCB ( I3 )
Open the `UPS OUTPUT' MCB ( I4 ).
Open the `MAINS INPUT' MCB ( I1 ).
Open the `RESERVE INPUT' MCB ( I2 ).
Open the `INTERNAL BATTERY' fused switch ( I5 ).
Check that the load continues to be powered from the Maintenance Bypass Mains supply
while the UPS is off.
Wait a minimum of 10 minutes before proceeding to allow the DC bus voltage to discharge.
Remove the top cover of the UPS to gain internal access to the unit.
Close the `RESERVE INPUT' MCB. ( I2 )
D wait until the fan is running, indicating that the output voltage is present.
Close the `MAINS INPUT' MCB. ( I1)
Wait until the Operator panel shows the following indications:
D LCD is energize and
D The alarm buzzer sounds.
D The red `ALARM'LED ( 2 )
D The yellow `BYPASS ON' LED will illuminate.
Close the `INTERNAL BATTERY' fused switch. ( I5 ).
Close the `UPS OUTPUT' MCB. ( I4 ).
Open the `MANUAL BYPASS' MCB. ( I3 ).
Start the inverter as follow:
a) Press the `MENU' push button ( A ) on the FRONT PANEL.
b) Select the `COMMAND' screen by pressing either the `BACK' ( C ) or `NEXT' ( b ) push
button.
c) Confirm the `COMMAND' menu selection by pressing `BACK' and `NEXT' at the same
time (i.e. ENTER).
d) Select the `INVERTER ON- OFF' screen by pressing either the `BACK' ( C ) or `NEXT' (
b ) push button.
e) Confirm `INVERTER ON' function by pressing `BACK' and `NEXT' at the same time.
D A ***CONFIRMED*** message will be displayed
f) Press `CLEAR' ( d ) twice to return at the main screen.
Within approximately 20 sec. and the follow sequence should occur:
D The green `NORMAL' LED ( 1 ) has illuminated.
D The red `ALARM' LED ( 2 ) has extinguished.
D The yellow `BYPASS ON' LED ( 4 ) has extinguished.
D The green `LOAD-on-INV' LED ( 3 ) has illuminated.
Place the mechanical lock, onto the `MANUAL BYPASS' MCB.
Chapter 6 - Maintenance
Scheduled Maintenance
6 - 3