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MITSUBISHI ELECTRIC 2033C SERIES UPS
MITSUBISHI
ELECTRIC
2033C SERIES UPS
OWNERS / TECHNICAL MANUAL
Page Number:
1-8
The two positions are identified as NORMAL and BYPASS. In the NORMAL position the load is fed
by the UPS - either through the inverter or through the static bypass line. In the BYPASS position
the load is powered by an external source such as the utility or a generator. This transfer operation
must be made while the UPS is in the static bypass mode.
The transfer procedure to place the UPS in maintenance bypass mode, or from bypass mode to
normal operation mode is outlined below:
A) Transfer of load from inverter to maintenance bypass
1. On the front panel, press the "STOP" button. The “BYP.OP.” LED illuminates within 3
seconds.
2. After confirming that the “BYP.OP.” LED is illuminated, Rotate MBS(52CS/SWM) clockwise
to the “TRANSFER” position (Do not rotate 52CS/SWM if the “BYP.OP.” LED is NOT
illuminated).
3. After 3 seconds, rotate 52CS/SWM clockwise to the “BYPASS” position.
4. Transfer complete. Load is now powered from the external source. UPS can be shutdown.
B) Transfer of load from maintenance bypass to inverter
1. Rotate 52CS/SWM counterclockwise from the “BYPASS” position to the “TRANSFER”
position, wait 5 seconds.
2. On the UPS, confirm the “BYP.OP.” LED is illuminated. If not, press the “STOP” button.
3. Rotate 52CS/SWM counterclockwise to the “NORMAL” position.
4. On the UPS, press the “START” button. The “INV.OP.” LED should illuminate.
5. Transfer complete. Load now powered by the inverter.