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MR33 Series (75K-600K) Modular UPS
User Manual 2 Overview
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11
Battery power supply mode
When mains abnormal, system will switch to battery input, the Boost circuit promotes the battery
voltage to a certain value and then supply the DC power to the inverter, that makes the AC output
without interruption phenomenon and then protect the load. The specific work process is as follows.
When mains abnormal at any time, the rectifier will switch to battery input immediately to maintain
the voltage of DC electrolysis, which guarantee the inverter without power down. Before battery
discharge completely, if mains recovers, the rectifier will switch to mains input and charge battery at
the same time. During the switch between grid power supply and battery power supply, the inverter
output cannot power down.
In battery power supply mode, if mains does not recover normal all the time, and the battery energy is
running out, the UPS will send sound & light alarm, and stop working at the max. discharge point,
and long beeps to alarm. At that time, the load will power down.
Bypass power supply mode
When system abnormal (such as over-temperature, short-circuit, output voltage abnormal or overload)
and exceed the bear range, the inverter will shut down to avoid damage automatically. If mains still
normal at this time, it will turn to bypass to supply power for load. The specific work process is as
follows.
If the inverter circuit fault or inverter overload and exceed the bear range, the UPS will turn to bypass
to output. During bypass power supply, if fault or overload removed, the UPS will start inverter and
begin to supply power for load. When the load is serious overload and exceeds the bypass bear range,
the UPS will close the bypass output, and it will cause user load power down. When load fault or
short circuit, the UPS will switch to bypass to supply power from inverter. If the short-circuit is
serious, the UPS mains breaker and bypass breaker may trip out. After suffering the short-circuit fault,
UPS will try to restart. If the short-circuit is removed, the UPS will switch to inverter; if the fault is
not removed, the UPS will try to restart for 5 times. 5 times later, the UPS will turn to fault protection.
At this time, it needs to power off or press the touch screen to shut down the UPS, and restart the
UPS, and then, it will recover normal work.
Maintenance bypass power supply mode
When the UPS needs to be maintained and the power supply for load cannot be interrupted, user can
shut down the inverter and make the UPS works in bypass status, then switch on the maintenance
bypass breaker and switch off the mains pint breaker and bypass power supply breaker. During the