4-72
4-2 Function Mode
4
Functions
•The setting of this function is applied to the FRS terminal, and also to the status when the Inverter
is reset from free running.
(Example 1) 0-Hz start (Example 2): Frequency matching start
• The Inverter starts running at 0 Hz regardless of the
motor rpm. The retry wait time is ignored at 0-Hz
start.
• If the Inverter starts running at 0 Hz with the motor
rpm high, an overcurrent trip may occur.
• When the FRS terminal is turned off and the retry wait
time elapses, the motor frequency is matched and a
Active Frequency Matching starts without stopping
the motor. If an overcurrent trip occurs at frequency
matching start, extend the retry wait time.
• Even if "frequency matching start" is selected, the
Inverter may start at 0 Hz when:
• The output frequency is equal to or lower than
1/2 of the base frequency
• The motor induction voltage quickly attenuates
• The Inverter detects a frequency equal to or
lower than the frequency matching lower limit
frequency setting (b007)
FW
FRS
Motor
rpm
0
Free running
0-Hz start
FW
FRS
Motor
rpm
Free running
b003
0
Frequency
matching start
(Example 3) Active Frequency Matching restart
• After the retry wait time (b003) elapses, the
Inverter starts output from the b030 set value.
The Inverter then decelerates according to b029,
while keeping the output current at the b028 set
value.
• When the frequency matches the voltage, the
Inverter accelerates again, and then output
frequency is restored to the original level.
• If an overcurrent trip occurs under this method,
reduce the b028 set value.
Output
current
FW
RS
b028
Decelerates
according to b029.
Frequency selected
in b030
Trip occurs
b003
Motor rpm
Inverter output
frequency
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