Procedure For Carrying Out A Reset After A Recognised Controlled Transfer To Bypass Or Epo Action - Liebert 7200 Series User Manual

Chapter 2 - Operating Instructions
Procedure
The Maintenance Bypass Power switch may be operated at any time when the UPS is powered down to connect the
load to the maintenance bypass supply if required.
The load equipment is not protected from normal supply aberrations when operating in the maintenance bypass
mode.
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
Overtemperature, 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 4550004E.
This operation can be easily done trough 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 a.c. power supply circuit
breaker, the RESET switch would have no affect on it. First close the external input a.c. 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.
Page 2-6
Issue 6
(03/98)
document in response to "powersure ups"
IMPORTANT
7200 Series UPS User Manual
Single Module and 1+1 Parallel System