Service manual

Always On UPS Systems
M0704_NX_Series_Service_Manual V2.17 2012-06-12 14
11. STARTUP PROCEDURES
Using the following procedure below start up the UPS, or use “manual
bypass to inverter procedure”.
11.1. System start up (from complete shutdown)
Follow Step by step - confirming each operation
Use the Status Indicator Table as a guideline.
Note: Proceed until a failure mode occurs – then record status of indicators and step
failure occurred.
If fault cleared during start up
Do operational checks of all UPS functions.
Backup mode, charging, etc
Record status and readings on commissioning/ repair forms
a. Close all fuse holders behind control module assembly door.
- Apply AC supply to UPS
b. Turn Input breaker to ON position
- This will apply power to the input transformer and feed the Rectifier,
Reserve and Bypass breakers
c. Turn Reserve Breaker to ON position
- This will apply power to the auxiliary power supply systems that in turn, will
start the main control electronics inside the UPS.
 LCD lights up – displays general information about the UPS
 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
d. Push the OFF button (0) on front panel to clear alarm indicators on the Main
Control PCB.
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 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.