Maintenance Bypass - MAKELSAN PM Series User Manual

PM SERIES

4.2.4 Maintenance Bypass

To supply the load via Mains, you may simply active the internal mechanical bypass switch.
CAUTION!
The load is not protected by the UPS when the internal mechanical bypass system is
active and the power is not conditioned.
Switch to mechanical bypass
CAUTION!
If the UPS is running normally and can be controlled through the display, carry out
steps 1 to 5; otherwise, jump to Step 4.
▪ Open the cover of maintenance switch, the UPS turns to bypass mode
automatically.
▪ Switch on MAINTANCE breaker;
▪ Switch OFF BATTERY breaker;
▪ Switch OFF the MAINS breaker;
▪ Switch OFF OUTPUT breaker;
At this time the bypass source will supply to the load through the MAINTENANCE breaker.
Switch to normal operation (from mechanical bypass)
CAUTION!
Never attempt to switch the UPS back to normal operation until you have
verified that there are no internal UPS faults
▪ Open the front and rear doors of the UPS to be easily access to the main power
switches
▪ Switch ON the output breaker;
▪ Switch ON the input breaker;
▪ The UPS powers from the static bypass instead of the maintenance bypass, then the bypass
LED will light up.
▪ Switch OFF the maintenance bypass breaker, then the output is supplied by the
bypass of the modules.
▪ Put on the maintenance switch cover.
The rectifier will operate normally after 30 seconds. If the inverter works normally, the system
will be transferred from bypass mode to normal mode.
UDD-SD-125/ Release Date: 20.01.2015/Rev No: 0/Rev.
Date
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