4. Connect output terminals of PSMBSW10K switch module to load.
5. Connect UPS EMBS terminals to PSMBSW10K EMBS terminals
Connection of UPS and External Maintenance Bypass Switch Module
Refer to the illustration below for wiring connections:
WARNING: It is essential to connect the EMBS (C1, C2) terminals on the UPS to the EMBS (C1, C2) terminals
on the Maintenance Bypass Switch module. Failure to do so will cause damage to the UPS and void the
warranty. Check the UPS model User manual for the Rear Panel Terminal Block Pin assignment.
4. Operation
Transfer to Maintenance Bypass
To transfer from UPS mode to maintenance “Bypass”, follow the steps below:
Step 1:
To transfer the UPS to static bypass mode automatically, unscrew the two fasteners and
remove the maintenance switch front cover plate above the switch. This will automatically
release the micro switch located behind the maintenance cover plate (and will connect C1 to
C2 on the normally opened micro switch contacts across the EMBS terminals).
Important: Verify the UPS has switched to static bypass mode on the LCD located on the
front panel of the UPS. If this does not happen then do NOT proceed any further.
NOTE: EMBS terminals on module must be correctly connected to EMBS terminals on UPS.
Step 2:
1) For Bypass and Test mode - rotate switch to “BYPASS” position. In this position the UPS
will still receive mains power however the load will be fed from the mains. Testing can
now be performed on the UPS.
2) For Bypass and Isolate mode - switch off PSMBSW10K input breaker on the module. In
this position the UPS will receive no power whatsoever and the load will be supplied from
mains. After confirming there is no voltage present on the terminals the UPS can be
safely removed from the circuit.
All load devices will now be powered directly by the utility and not through the UPS. After
disconnecting the batteries from the UPS, the service and maintenance of the equipment may
commence.
Transfer back to UPS mode
To transfer from maintenance “Bypass” to UPS mode, follow the steps below:
Important: Ensure PSMBSW10K maintenance switch front cover plate is off.
Step 1: Reconnect Battery system and switch UPS input breaker and switch on the
PSMBSW10K input breaker. The UPS will then enter static bypass mode.
Important: Verify the UPS has switched on and is in static bypass mode on the LCD located
on the front panel of the UPS. If this does not happen then do NOT proceed any further.
Step 2: Rotate switch to “UPS” position. All load devices will now be powered by the utility
through the UPS operating in static bypass mode.
Step 3: Replace and secure the PSMBSW10K maintenance switch cover plate.
Step 4: Press “ON” button located on the front panel of the UPS unit. Confirm UPS output is
operating through the inverter on LCD. All the Load devices will now be fully protected by the
UPS.
5. Specification of Critical Components
