Hitachi J300U Series - Manual (Page 128)

A-16
WARNING
l If the retry mode is selected, do not approach the inverter unnecessarily. It will be
restarted suddenly after it trips/stops. (Design the inverter so that the safety can be assured
even in such a restart.) Otherwise, bodily injury will result.
NOTE: Since the retry mode is selected, the equipment restarts for trips of overcurrent,
overvoltage, or undervoltage. For undervoltage, 16 retries (17th trip) are
executed. For overcurrent or overvoltage, 3 retries (fourth trip) are executed.
Do not use this function for a case that a fallen substance should be held by the
machine brake when the motor is in the free-run mode.
In the following cases, the equipment may start at the lowest frequency (called 0 start).
1) When the reclosing standby time (function mode F-22, IPS WAIT) after the
instantaneous power failure is recovered is set to 3 seconds or more
2) When the output frequency is more than 60 Hz
3) When the base frequency is 60 Hz: Driven at 30 Hz or less
When the base frequency is 50 Hz: Driven at 25 Hz or less
4) When the induced voltage of the motor attenuates earlier (for example, a pump or high-
speed gear which causes the motor to decelerate for several seconds or less)
NOTE: The inverter control power holding time may be slightly different depending on
the inverter rating, the load status, remote operator (copy unit) connection status,
and input voltage.
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t 0
t 0 t 0
t 1 t 1 t 1
t 2
t 2 t 2
Power supply
Inverter control
power supply
Allowable
instantaneous
power failure time
F-22
(data set value)
Inverter output
F-22 (IPS WAIT set value) About 1 second
An instantaneous power failure trip
(Inst.p-f) occurs because t 2> t 0.
t 1: Control power holding time
when power is turned OFF
The operation restarts because t 2>= t 0.
t 2: F-22 (IPS TIME set value)
The running restarts when a running
command is issued because t 2> t 1.
t 0: Instantaneous power failure time
Alarm