OM226142 rev C
19
3.3 BYPASS
OPERATION
Bypass operation may occur for both manual or automatic change-over. The manual
transfer is due to the BYPASS SWITCH, that forces the load to bypass. In the event of a
bypass failure the load is transferred back to inverter without interruption.
Picture 15 – Bypass operation (manual change-over)
Section Status
Further
explanation
Rectifier Mains
available
and within the tolerance range (may be
outside the tolerance range)
RCB CLOSED
Rectifier
OFF / ON
Battery
available
and within the tolerance range
BCB CLOSED
Inverter ON
Bypass Mains
available
and within the tolerance range
BYPASS SWITCH
“BYPASS”
SBCB CLOSED
Static Switch SSI
OFF
Static Switch SB
ON
OCB CLOSED
MBCB OPEN
Output Voltage
available
and within the tolerance range
The automatic change-over occurs for the reasons explained in the UPS technical
description (see paragraph 2.4.1); basically when the power supply to the load within the
specified tolerance cannot be assured by the inverter.
