GAMATRONIC ELECTRONIC INDUSTRIES LTD.
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SA: 20, 30 and 40 kVA, Release 2.1
151
13. USING A MAINTENANCE BYPASS SWITCH
An external maintenance bypass switch can be connected to the UPS.
13.1 Putting the UPS into Maintenance Bypass Mode
When present, an external maintenance bypass switch allows the UPS to be manually shut
down for servicing without affecting the loads.
THE MAINTENANCE BYPASS SWITCH MAY BE OPERATED BY
QUALIFIED SERVICE PERSONNEL ONLY
To put the system in maintenance bypass mode:
1. Verify that the bypass indicator is lit on the static switch (if it is not lit, the UPS
cannot go into bypass mode).
2. On the controller front panel, press the INV/BYP button twice to put the UPS in
bypass mode.
3. Verify that the bypass indicator is lit on the controller.
4. Switch ON the external maintenance bypass circuit breaker.
5. Switch OFF the external ac output circuit breaker.
6. Switch OFF the external rectifier input switch.
7. Disconnect the dc fuses.
The UPS is now available for service or maintenance as required.
13.2 Returning the UPS to Normal Operation
To move the system from maintenance bypass mode to normal operation mode:
1. Connect the dc fuses.
2. Switch ON the external rectifier input switch.
3. Switch ON the UPS (refer to section 7.1, Start-up after Shutdown, starting on page
48).
4. Press the INV/BYP button twice to put the UPS into bypass mode.
5. Verify that the bypass indicator is lit on the controller.
6. Switch ON the external ac output circuit breaker.
7. Switch OFF the external maintenance bypass circuit breaker.
8. On the controller front panel, press the INV/BYP button twice put the UPS in inverter
(normal) mode.
9. Verify that the green INV indicator is lit on the controller front panel.
The loads are now supplied by the UPS.
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