inform ETR EVO Series, Installation And Operating Manual

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ETR EVO UPS User Manual (Ver. 1.0) Page 50
7.6. Manual (Maintenance) Bypass Commissioning Instruction
Manual by-pass 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.
This feature is useful while performing maintenance or service and shall only be executed by
authorized technical service personnel.
In order to transfer to Manual Bypass without interruption, do the following instruction respectively;

Open the front cover.

Switch the Manual Bypass circuit breaker (F3) to “ON” position.

See “Manual Bypass Operation” written on LCD.

Switch the output circuit breaker (F2), the battery circuit breakers (F5) –the breakers on external
battery cabinets if any-, the input circuit breaker (F1) and inrush circuit breakers (F6) to “0”
position.

If UPS with split-bypass option, then switch the bypass (F4) circuit breaker to “0” position.

LCD would be off and the alarms would be silenced.
The loads will be continued to be supplied directly from the mains.
7.7. Manual (Maintenance) Bypass Decommissioning Instruction
In order to transfer the loads from Manual Bypass to UPS without interruption, do the following
instruction respectively;

Switch the input circuit breaker (F1) to “I” position.

If exists, switch Bypass circuit breaker (F4) to “I” position.

Switch the inrush circuit breaker (F6) to “I” position.

LCD will be ON. Go to Measurements menu and wait till DC busbar voltages be min. 360VDC.

Switch the battery circuit breaker (F5) and external battery cabinet breaker if any to “I” position.

Switch the output circuit breaker (F2) to “I” position.

See “Manual Bypass Operation” written on LCD.

Wait 2 minutes till the UPS completes the test.

Switch the Manual Bypass circuit breaker (F3) to “0” position.

See “Online Operation” written on LCD.
This procedure may only be executed by authorized Technical Service Personnel.
Some parts inside the UPS (terminals, EMC filters and measurement circuits) are still
energized during maintenance bypass operation. In order to deenergize all UPS parts, circuit
breakers on mains and bypass mains distribution panels feeding the UPS and circuit breakers
on external battery cabinet shall be brought to “OFF” position. Internal batteries shall also
be
isolated from the system.
During Manual Bypass operation; in case of any mains interruption occurs, all loads
on the
output will be deenergized. Manual Bypass Operation should not be preferred for
long time
use.