•
The examples below assume that the FRS terminal is used.
When the motor is stopped in a free-run state by the STOP command, restarting of the inverter
occurs in the same timing as when the FRS terminal turns OFF.
(Example 1) 0-Hz restart (b088 = 00)
FW
FRS
Motor
rotation
speed
0
•
The inverter restarts at 0 Hz independent of the
motor rotation speed. The Restart Standby Time
setting will be ignored during 0-Hz restart.
•
If the inverter starts at 0 Hz at a high motor rotation
speed, an overcurrent trip may occur.
(Example 2) Frequency pull-in restart (b088 = 02)
FW
FRS
Output
current
Inverter
output
frequency
Motor
rotation
speed
b003
Decelerates accord-
ing to b029
b028
Frequency selected
in b030
•
When the set Restart Standby Time (b003) elapses,
the inverter starts output at the frequency set in the
Starting Frequency Selection at Frequency Pull-in
Restart (b030). When b088 is set to 01, the inverter
starts output at the frequency at shutoff.
Then, the inverter decelerates the motor according
to the Frequency Pull-in Restart Parameter (b029)
setting, while suppressing the output current to the
value set in the Frequency Pull-in Restart Level
(b028).
•
When the current decreases to or below the Fre-
quency Pull-in Restart Level (b028), the inverter accel-
erates again to return to the original frequency.
•
If an overcurrent trip occurs with this method,
reduce the Frequency Pull-in Restart Level (b028).
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