OM226142 rev C
21
3.4 MANUAL
BYPASS
The manual bypass operation is necessary every time the functionality of the UPS needs
to be checked or during maintenance or repair works.
The manual bypass procedure is described in the UPS operating manual and must be
followed carefully in order to avoid damages to the UPS.
During the functional check of the UPS, all the breakers can be closed, except for the
output breaker OCB, and the full functionality can be tested.
Picture 17 – Manual Bypass for functional tests
Section Status
Further
explanation
Rectifier Mains
available
and within the tolerance range (may be
outside the tolerance range)
RCB CLOSED
Rectifier
ON / OFF
(depending on the tests needed)
Battery available
BCB
OPEN / CLOSED
(depending on the tests needed)
Inverter
ON / OFF
(depending on the tests needed)
Bypass Mains
available
and within the tolerance range
BYPASS SWITCH
“NORMAL /BYPASS” (depending on the tests needed)
SBCB
OPEN / CLOSED
Static Switch SSI
ON / OFF
(depending on the tests needed)
Static Switch SB
ON / OFF
(depending on the tests needed)
OCB OPEN
MBCB CLOSED
Output Voltage
available
supplied directly by the bypass mains
During the manual bypass operation for repair or maintenance, the UPS is completely
switched off and the load is supplied directly by the bypass mains.
