Service manual

Always On UPS Systems Inc
16
- Status LEDs indicate status of sub-systems – many alarm indicators will be
illuminated as the rectifier does not yet have AC power applied, and the DC
buss has not been established;
 Battery Low Stop, low battery, fuse/temp, Rectifier AC Fail, Rotation
Error
c. Push the OFF button (0) on front panel to clear alarm indicators on the Main
Control PCB.
d. Open the Bypass breaker.
e. Turn Rectifier Breaker to ON position
- Power is applied to the rectifier control module and rectifier power devices.
Once the power has been qualified as acceptable, the rectifier will start to
ramp up the DC voltage from 0Vdc to 390Vdc over a period of approximately
20 seconds. The DC buss generated is used to simultaneously charge the
batteries and supply DC to the inverter.
- Fault indicators will clear sequentially as the DC voltage rises to normal
operating levels;
 Rectifier AC Fail, Rotation Error, Fuse/temp, Battery Low, Battery
Low Stop
f. Turn Battery fuse or Breaker to ON position.
- Connects the battery bank to the DC buss being generated by the rectifier.
g. Turn Inverter ON – push buttons on front panel.
- Inverter will ramp up over a 7 second period and then supply power to the
output of the UPS.
- Fans will start, output voltage will be present.
- Indicators will show normal inverter operation of the system.
h. Turn Inverter Off – push buttons on front panel.
- This will turn the inverter OFF and put the UPS in Static bypass mode.
Reserve power will feed the output of the UPS. The switch from inverter to
reserve power should be seamless and uninterrupted.
- Indicators will show Static Bypass status.
i. Turn Inverter ON – push buttons on front panel.
- Inverter will ramp up for 7 seconds then Static switches will transfer to
Inverter mode. The switch from reserve power to inverter should be seamless
and uninterrupted.
- Indicators will show normal inverter operation of the system.
j. Backup Mode test – turn Input Breaker to OFF position.
- Utility power will be removed from the UPS inputs.
- Rectifier will become disabled and the Batteries will be providing DC power
to the Inverter. The switch to backup mode should be seamless and
uninterrupted.
- Indicators will show backup mode operation, UPS will be beeping.
 Rectifier AC Fail, Rotation Error, Reserve AC Fail, Reserve Freq Fail
k. Rectifier restart – Turn Input breaker to ON position.
- Rectifier will ramp up its DC output voltage over a period of 20 seconds and
assume the load from the battery bank. It will then provide charging current to
the batteries.