5-46
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Chap. 5 FUNCTION CODES
• Auto-restarting after momentary power failure IPF
This output signal is ON during the period after the occurrence of momentary power failure until the completion of
restart (the output has reached the reference frequency). When the IPF is ON, the motor slows down, so perform
necessary operations. ( For details about IPF, refer to E20 through E24 and E27 (data = 6).)
Restart mode after momentary power failure (Basic operation with auto search enabled)
Auto search for idling motor speed will become unsuccessful if it is done while the motor retains residual voltage. It is,
therefore, necessary to leave the motor for the time (auto search delay time) enough to discharge the residual voltage.
The delay time is specified by H46 (Starting Mode (Auto search delay time 2)).
The inverter will not start unless the time specified by H46 has elapsed, even if the starting conditions are satisfied. (
For details, refer to H09 and d67.)
• To use auto search for idling motor speed, it is necessary to tune the inverter beforehand.
• When the estimated speed exceeds the maximum frequency or the upper limit frequency, the inverte
disables auto search and starts running the motor with the maximum frequency or the upper limit frequency,
whichever is lower.
• During auto search, if an overcurrent or overvoltage trip occurs, the inverter restarts the suspended auto
search.
• Perform auto search at 60 Hz or below.
• Note that auto search may not fully provide the expected/designed performance depending on conditions
including the load, motor parameters, power cable length, and other externally determined events.
• When the inverter is equipped with any of output circuit filters OFL--2 and -4 in the secondary lines,
it cannot perform auto search. Use the filter OFL--A instead.
Restart mode after momentary power failure (Allowable momentary power failure time) (H16)
H16 specifies the maximum allowable duration (0.0 to 30.0 seconds) from an occurrence of a momentary power failure
(undervoltage) until the inverter is to be restarted. Specify the coast-to-stop time which the machine system and facility
can tolerate.
If the power is restored within the specified duration, the inverter restarts in the restart mode specified by F14. If not,
the inverter recognizes that the power has been shut down so that the inverter does not apply the restart mode and starts
normal running.
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
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