MR33 Series (75K-600K) Modular UPS
User Manual
5 Use and Operation
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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 POWER switch, BYPASS switch, OUTPUT switch, MAINTENANCE switch 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, and the voltage should be in the range of
80V~280V, or, it only can be started from battery status.
Step 5
Measure the DC voltage of battery input terminal. 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 a certain value (-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 ND6 dry contact of system
monitor card.
----End
5.3.2 Startup
Step 1
Ensure that all the system parameters setting are right.
Step 2
Close the ready switch of bypass module and all power modules.
Step 3
Close the BYPASS switch
→
POWER switch
→
external battery switch, the UPS outputs by
bypass. (if it is battery start, for this step, just close the external battery switch, and then press the
battery button on the bypass module for more than 3s, the system power is set up.)
Step 4
Start the inverter.
Summary of Contents for MR33 Series
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