Instruction Manual

Doc. #: 0260011-J0 Rev B
74
7.9 Synchronization with a Maintenance Bypass Switch (MBS)
7.9.1 Internal Maintenance Bypass Switch
Implement the following sequence before switching the unit from bypass mode to inverter mode.
Switching from Bypass Mode to Inverter (On-line)
1. Switch on the Inverter AC Input breaker.
2. Wait for the inverters to synchronize to the line—all status LEDs on the inverters will turn green.
3. Switch on the Inverter AC Output breaker.
4. Smoothly rotate the maintenance bypass switch in a clockwise rotation from BYPASS to
INVERTER.
Figure 54 — Maintenance Bypass Switch
7.9.2 External Maintenance Bypass Switch
Before switching an external MBS from UTILITY mode to UPS mode:
1. Switch on the AMPS24 HP inverter input breaker. Wait for the inverters to synchronize to the line,
and for all status LEDs on the inverter modules to turn green.
2. Switch on the AMPS24 HP inverter output breaker.
3. Follow the steps in the external MBS user manual to switch the MBS bypass switch to UPS.