5-104
5-8 Restart Functions
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
Example 1) 0 Hz restart (b088 = 00)
The Inverter restarts running at 0 Hz regardless of the motor rotation speed. At 0 Hz restart, the
restart standby time is ignored.
If the Inverter restarts running at 0 Hz with the motor rotation speed high, an overcurrent trip may occur.
Example 2) Frequency matching restart (b088 = 01)
When the FRS terminal is turned OFF and the restart standby time elapses, the motor frequency
is detected and a frequency pull-in restart is performed without stopping the motor. If an
overcurrent trip occurs at frequency matching restart, extend the setting of restart standby time.
Note, however, that 0 Hz restart may be applied even when frequency matching restart is
selected, in the following cases:
 The output frequency is equal to or lower than 1/2 of the base frequency
 The motor induction voltage quickly attenuates
 Frequency Matching Lower Limit Frequency Setting (b007) is set and a frequency below the set
frequency is detected.
(Example 3) Frequency pull-in restart (b088 = 02)
After an elapse of the time set in Restart Standby Time (b003), output is started from the value
set in Starting Frequency at Frequency Pull-in Restart (b030). Thereafter, The Inverter
decelerates according to Frequency Pull-in Restart Parameter (b029) while keeping the output
current at the value set in Frequency Pull-in Restart Level (b028).
When the frequency matches the voltage, the Inverter accelerates again to reach to the original
frequency level.
If an overcurrent trip occurs under this method, reduce the b028 setting.
FW input
(forward)
FRS input
Motor rotation
speed
Free run
0 Hz restart
0
FW input
(forward)
FRS input
Motor rotation
speed
Free run
Frequency matching restart
b003
0
FW input
(forward)
FRS input
Output current
Inverter output
frequency
Motor rotation speed
Decelerates according to b029.
Frequency selected in b030
b028
b003
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