5 Use and Operation
IST Series UPS (10kVA-200kVA)
User Manual
72
5.3 UPS Start and Shutdown
5.3.1 Check before Startup
Before startup, check according to following steps. Only when the check is OK, then the UPS
can be started.
Step 1 Ensure that the mains input breaker (POWER), bypass breaker (BYPASS), output breaker
(OUTPUT), maintenance bypass breaker (MAINTENANCE) are all OFF.
Step 2 Check load.
Ensure that the load is not conductive load. The output of the UPS cannot be conductive
load, such as motor, fan, air-condition, etc. Generally, these loads are power supplied by
power-grid.
Ensure that the load is close. And at the same time, the load capacity should not exceed
the UPS rated output capacity, or, it will cause overload protection.
Step 3 Ensure that there is no short-circuit between the live wire and neutral wire, live wire and
grounding wire of input and output.
Step 4 Measure the AC voltage of mains input terminal (POWER), and the voltage should be within
the range of 80V-280V, or, it can be started from battery status only.
Step 5 Measure the DC voltage of battery input terminal (detailed position please see Figure3-
20).The voltage of positive battery group should be greater than a certain value (+11.5×
battery amount), the voltage of negative battery group should be less than (-11.5× battery
amount), and pay attention to the polarity, avoid wrong battery connection.
Step 6 Ensure that the auxiliary contact of battery breaker is connected to the ND4 dry contact of
system monitor card at front of the UPS.
----End
5.3.2 Startup
Step 1 Recheck all the system parameters setting and ensure that the setting is right.
Step 2 Close the bypass breaker (BYPASS), ensure that the system bypass input is normal and with
no output. The UPS is initializing. After initializing, the system will turn to bypass power supply.
Look up the system running status in the touch screen, and ensure that the system is power
supplied by bypass.
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