Uninterruptible Power Supplies Online UPS 3K User Manual download pdf (Page 40)

4: Operating Procedures

4-6 UPS724-01-00 PowerWave 1000 (1-3kVA) User Manual - Dated 26 June 2013

4.4 Manual load transfer between inverter and bypass

Some installations might include an external (maintenance) bypass circuit connected in parallel with the UPS

to provide an alternative power source for the load supply. Such installations are designed to enable the UPS

to be totally removed or powered down, for troubleshooting, without disrupting the load.

The PowerWave 1000 allows the operator to manually switch the load between inverter and bypass so that it

can be used within an external bypass environment.

Note: In practice, a variety of external bypass designs are used, so explicit external bypass operating

instructions are not provided here. The following instructions refer only to the UPS internal inverter/bypass

transfer operation.

To transfer the load from the UPS inverter to the internal bypass:

To transfer the load from the static bypass back to the UPS inverter:

1. Simultaneously press the ON and UP buttons for approximately 3~5

seconds, until you hear a double beep, then release them.

a) The LCD mimic will show the load connected to the input LINE via

the internal bypass.

b) The batteries are shown still connected to the input LINE and

charging (if the charger is still operative).

c) The bypass supply led will be flashing approximately once a second.

d) The audible alarm will sound but can be silenced by pressing the ON

button.

e) All metered parameters can be monitored as per normal.

Note: If the UPS input mains supply is disconnected when it is operating on

bypass, the UPS will not revert to battery power but will instead shut down

with a

faIL status indication. The UPS internal electronics will remain

powered from the battery and all leds will extinguish apart from the red

FAULT

led, which will be permanently lit, and the audible alarm will sound

continuously.

1. Simultaneously press the ON and UP buttons for approximately 3~5

seconds, until you hear a double beep, then release them.

a) The LCD mimic will show the load connected to the UPS.

b) The bypass supply led will be permanently illuminated.

c) The audible alarm will sound but can be silenced by pressing the ON

button.

d) The LCD display will revert to normal (on-line mode) indications.

LINE UPS LOAD

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Uninterruptible Power Supplies Online UPS 3K User Manual Page 40