Toshiba 4200FA user manual Maintenance Bypass Procedure, From UPS to Maintenance Bypass

TOSHIBA

5.19 Maintenance Bypass Procedure

When operating the Maintenance Bypass, the following operation procedure should be used:

WARNING	Failure to adhere to the following instructions could result in damage to your
	equipment and/or you risk removal of power to any equipment attached to
	the UPS.

From UPS to Maintenance Bypass

1)Move the “STOP/RUN” key switch, located on the front panel, to “STOP." Operation of the UPS inverter stops. Output power is now provided to the load through the Bypass circuit. While in this mode, if a power failure occurs on the commercial power source, the UPS will lose power. Power to the critical load device will be interrupted. The battery charging circuit and chopper circuit remains active.

2)Verify that step one above is followed, and that the Bypass light indicator on the front panel is lit.

3)Locate the Maintenance Bypass Rotary Switch (middle front panel of the UPS); slowly rotate the Cam Switch clockwise until “BYPASS MODE” Position is reached.

4)Turn off MCCB1 breaker labeled “MAIN POWER SWITCH."

The unit is now in the Maintenance Bypass mode and may be serviced. For units with an internal isolation transformer, the transformer is still active.

From Maintenance Bypass to UPS

1)Verify that the “STOP/RUN” switch is in the “STOP” position. Turn on MCCB1

“MAIN POWER SWITCH."

2)Wait until the output fans turn on (This is a good indication that the unit is in the Bypass mode), and that the Bypass indicator light on the front panel is lit.

3)For units with an external battery cabinet, turn on MCCB1 “BATTERY CABINET."

4)Locate the Maintenance Bypass Switch (Middle front panel of the UPS) slowly rotate the Cam Switch counter-clockwise until “UPS MODE” Position is reached.

5)Rotate the “STOP/RUN” switch to the “RUN” position.

6)Verify that the Inverter indicator light on the front panel is lit.

The unit is now back On-Line and supplying conditioned power to the load.

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