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.
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