54
* It shows Utility input is “0” and Utility Abnormal.
5. Switch the output circuit breaker (Q2) to “ON” position.
6. Switch the output circuit breaker on the distribution panel to “ON” position.
Afterwards UPS starts to supply the loads.
This feature is useful while performing maintenance or service and shall only be execut-
ed by authorized technical service personnel.
Warning:
For models 6 and 10kVA with internal insulation transformer, the transformer
remains powered inside the maintenance bypass circuit, even when input switch Q1 is
in OFF position!
To have complete shutdown of the UPS including transformer, switch off UPS upstream
supply MCCB in the distribution panel (in this case load supply is also interrupted).
• Press OFF key pad for about 5 seconds, the Inverter output will be turned off, then the output load is
supplied by Bypass loop and “OFF” would be written on LCD screen (as drawing B).
• Remove the cover of Maintenance Bypass circuit breaker.
• Switch the Maintenance Bypass circuit breaker (Q4) to “ON” position.
• See
drawing on LCD. It means UPS operates on Maintenance Bypass Mode.
• Switch the output circuit breaker (Q2), the input circuit breaker (Q1), the battery circuit breaker (Q3) and
the breakers on external battery cabinet(s) (F5) if any- to “OFF” position.
The loads will be continued to be supplied directly from the mains.
9.5.
Maintenance Bypass Commissioning and Decommissioning Instructions (6-10kVA)
Maintenance bypass enables the user to isolate the electronic circuitry of the UPS from the mains and the
load without interrupting the load operation by connecting the loads directly to the bypass supply.
9.4.
Decommissioning
Follow the order written below to decommission the
UPS:
1. Switch the output circuit breaker on the distribution panel to
“OFF”
position.
2. Switch the output circuit breaker
(Q2)
to
“OFF”
position.
3. Switch the battery circuit breaker
(Q3)
to
“OFF”
position.
4. If exists, switch external battery cabinet(s) circuit breakers
(F5)
to
“OFF”
position.
5. Press
OFF
key pad for about 5 seconds, the Inverter output will be turned off, then the output load is
supplied by Bypass loop and
OFF
would be written on LCD screen (as drawing B).
6. Switch the input circuit breaker on the distribution panel to
“OFF”
position.
7. Switch the input circuit breaker
(Q1)
to
“OFF”
position
H
I
OFF
OFF
