Hitachi J300U Series Instruction Manual page 128

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).
When the reclosing standby time (function mode F-22, IPS WAIT) after the
1)
instantaneous power failure is recovered is set to 3 seconds or more
When the output frequency is more than 60 Hz
2)
When the base frequency is 60 Hz: Driven at 30 Hz or less
3)
When the base frequency is 50 Hz: Driven at 25 Hz or less
When the induced voltage of the motor attenuates earlier (for example, a pump or high-
4)
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.
<Time chart for retry mode>
t
Power supply
Inverter control
power supply
t
2
Allowable
instantaneous
power failure time
F-22
(data set value)
Inverter output
Alarm
An instantaneous power failure trip
(Inst.p-f) occurs because
t
0: Instantaneous power failure time
0
t
1
The operation restarts because
t t
2> 0.
t
1: Control power holding time
when power is turned OFF
WARNING
t
0
t
1
t
2
F-22 (IPS WAIT set value)
t
2>=
t
2: F-22 (IPS TIME set value)
A-16
t
0
t
1
t
2
t
0. The running restarts when a running
command is issued because
About 1 second
t t
2> 1.