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2.6 Procedure for carrying out a RESET after a recognised controlled transfer
to bypass or EPO action.
When the necessary action to correct the problem has been taken, this
procedure should be followed to restore the UPS back to its normal
operating condition following, a controlled transfer to bypass or when
the Remote Emergency Power Off switch has been activated.
A recognized controlled transfer to bypass is activated by the following
problems: Inverter Over temperature, Cut-off Overload, Battery Over
voltage, when configured for a manual return from bypass operation
(only for system test).
1. Gain access to the UPS logic board - Open the UPS right hand
door (see figure 2-2).
2. Press the RESET push switch, labeled S1 on the UPS Logic
board (part number 100221011030). This operation can be easily
done through the hole on the screening panel using, for instance, a
plastic pencil or similar. Operation of this push button resets the logic
circuitry to enable the rectifier, inverter and static switch to operate
normally.
Note: When the remote EPO switch has been activated it is
necessary to manually close the battery circuit breaker. When the
EPO system incorporates a trip facility of the external input AC
power supply circuit breaker, the RESET switch would have no
affect on it. First close the external input AC supply circuit
breaker, the UPS can be started in the normal manner, as the
logic circuits will automatically reset on return of the power
supplies.
3. On completion, close the UPS doors.
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