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A-15
Appendix 2 Instantaneous Power Failure Restart and Commercial Power Source Switching
1. Instantaneous power failure restart
[Function Outline]
This function allows an inverter operation to be selected according to the subject system as
follows when an instantaneous power failure occurs.
• Retry mode: When FTP/RST/ZST is set at IPS POWR
• Alarm mode: When ALM is set at IPS POWR
• f matching: The rotation speed and the phase are detected while the motor is on a free
running to restart the operation accordingly.
WARNING
l When the inverter stops due to a trip with retry mode selected, the motor restarts
suddenly. Stand clear of the machine. Otherwise, you may be injured. (Design the
machine in such a way that persons are protected against a restart of the machine.)
[Setting Method]
At overcurrent/
Remote operator [F-22]
Digital operator
At instantaneous power failure At low voltage
overvoltage/
At other
power module error
error
IPS TIME 0.3 to 25.0 — Set an allowable instantaneous
power failure time.
IPS WAIT 0.3 to 100.0 — Set a wait time after an instantaneous power failure/power restoration
in the retry mode or after an error.
IPS POWR ALM 0 Tripping with an instantaneous
power failure within the IPS
TIME. If an operation command
is issued for an instantaneous
power failure detected out of the
IPS TIME, restart the operation (0
Hz start).
FTP 1 The f matching stops with an
instantaneous power failure
detected within the IPS TIME.
The inverter trips with an
instantaneous power failure
detected out of the PIS TIME.
RST 2 The f matching is restarted if the
instantaneous power failure is
within the IPS TIME. The
inverter trips if the instantaneous
power failure is not within the
IPS TIME.
ZST 3 The inverter is restarted at 0 Hz if
the instantaneous power failure is
within the PIS TIME. The
inverter trips if the instantaneous
power failure is not within the
IPS TIME.
IPS TRIP OFF — No retry at an instantaneous power failure and no trip
at low voltage during the inverter stop.
ON — Retry or under voltage trip is performed during the
inverter stop or running.
—
Tripping
The f matching stops
if power is restored
within 40s.
The inverter trips
unless power is
restored within 40s.
The f matching is
restarted if power is
restored within 40s.
The inverter trips
unless power is not
restored within 40s.
The inverter is started
at 0 Hz if power is
restored within 40s.
The inverter trips
unless power is
restored within 40s.
—
Tripping
The f
matching is
retried.
—
—
—
—
Tripping
—
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