5 Basic Settings
5 - 44
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
This enables a smooth restart independent of the voltage between motor terminals.
Use this setting when the inverter is in free-run state for a long time due to a large load inertia.
• When the Frequency Matching Lower Limit Frequency (b007) is set, executing the frequency pull-in
restart function causes the inverter to restart at 0 Hz if the set frequency or less is detected.
• Immediately after a free-run stop, a large residual voltage remains between motor terminals. If the
inverter restarts the output, an overcurrent may occur. To circumvent this, set the Restart Standby
Time (b003) to a large value (at least 0.3 s).
• While in a free-run stop state, the motor is not subject to external influence because the inverter
output is shut off.
Even if the motor is stopped by an external brake or the effect of other equipment, the inverter can
still be used without detecting any overcurrent.
However, if the motor in a free-run state is rotated externally, the regenerated energy may be fed back
to the inverter. In this case, use the regenerative braking function.
• The examples below assume that you are using the FRS terminal.
Consider that, when the motor is in a free-run stop state, restarting of the inverter occurs in the same
timing as when the FRS terminal turns OFF.
Parameter
No.
Function name Data
Default
data
Unit
b088
Free-run Stop
Selection
00: 0-Hz restart
01: Frequency matching restart
02: Frequency pull-in restart
00 –
b003 Restart Standby Time 0.3 to 100.0 1.0 s
b007
Frequency Matching
Lower Limit Frequency
0.00 to 99.99
100.0 to 400.0
0.00 Hz
b028
Frequency Pull-in
Restart Level
Heavy
load
(CT)
0.20 x Rated current to 2.00 x Rated
current (0.4 to 55 kW)
Rated
current
value
A
0.20 x Rated current to 1.80 x Rated
current (75 to 132 kW)
Light
load
(VT)
0.20 x Rated current to 1.50 x Rated
current
b029
Frequency Pull-in
Restart Parameter
0.10 to 30.00 0.50 s
b030
Starting Frequency
Selection at Frequency
Pull-in Restart
00: Frequency at shutoff
01: Max. frequency
02: Set frequency
00 –
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