Fuji Electric FRENIC-HVAC User Manual page 408

Selection of Commercial Power Switching Sequence
J22 specifies whether or not to automatically switch to commercial-power operation when an
inverter alarm occurs.
Data for J22
0 Keep inverter-operation (Stop due to alarm.)
1 Automatically switch to commercial-power operation
• The sequence operates normally also even when SW52-1 is not used and the
main power of the inverter is supplied at all times.
• Using SW52-1 requires connecting the input terminals [R0] and [T0] for an
auxiliary control power. Without the connection, turning SW52-1 OFF loses also
the control power.
• The sequence operates normally even if an alarm occurs in the inverter except
when the inverter itself is broken. Therefore, for a critical facility, be sure to
install an emergency switching circuit outside the inverter.
• Turning ON both the magnetic contactor MC (88) at the commercial-power side
and the MC (52-2) at the inverter output side at the same time supplies main
power mistakenly from the output (secondary) side of the inverter, which may
damage the inverter. To prevent it, be sure to set up an interlocking logic outside
the inverter.
Examples of Sequence Circuits
1) Standard sequence
Sequence (upon occurrence of an alarm)
6-98