TS_604_01 PowerWave PW3000/TP User Manual UK 5/1/18
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4: Operating procedures
4.7
Single module – using the internal maintenance bypass
The inbuilt maintenance bypass circuit allows the UPS to be powered down while maintaining the load through the
(unprotected) bypass supply.
Transferring the load from UPS to the internal Maintenance bypass
1. Check the
SETTINGS
menu to ensure that the [Auto Bypass] is
enabled
– see paragraph 2.6.5.
2. If the UPS is operating in the ‘on-line’ mode, press the
ON/OFF
key on the Control Panel continuously for more than
three seconds.
a) The alarm buzzer will sound.
b) The UPS will transfer to ‘on-bypass’ mode and its output will remain live through the bypass supply.
3. Remove the Maintenance Switch cover plate on the back of the UPS.
4. Switch the Maintenance Switch from ‘UPS’ to ‘BPS’.
a) The load is now powered from the unprotected UPS bypass supply via the Maintenance Switch.
b) The UPS can now be powered down (e.g. for repair) by opening the input breakers M1 and M2 (position
OFF
) on
the back of the UPS together with the external battery cabinet fuses/isolator (where used).
Transferring the load from the internal Maintenance bypass to the UPS
1. If an external battery cabinet is used, check that the fuses/isolator on the back of the battery cabinet is closed and any
circuit breaker connected in the battery line is closed.
2. On the back of the UPS cabinet, close the input breakers M1 and M2 (position
ON
).
a) The fans will start running.
b) The UPS will perform a self-test and will then display the default menu on the LCD.
3. Switch the Maintenance Switch from ‘BPS’ to ‘UPS’.
4. Refit the Maintenance Switch cover plate on the back of the UPS.
a) The UPS will now be running with the load on bypass.
5. On the UPS Control Panel, press the
ON/OFF
key for more than one second.
a) The alarm buzzer will sound and the UPS will start.
b) After a few seconds, the UPS will switch to its ‘on-line’ mode.
6. Check that the LCD indicates the ‘on-line’ status and no warning alarms are present.
7. The UPS is now fully operational and providing protected output power.
CAUTION: This mode is normally used only by fully trained UPS service engineers when gaining internal
access to the UPS. It is not required during normal UPS operation or use.
WARNING:
With the UPS shut down allow at least 5 minutes for the UPS DC capacitors to discharge
before gaining internal access.
WARNING:
Even with the UPS input breakers M1 and M2 open, potentially lethal voltages are still present
within the unit.
