Omron RX Series User Manual page 240

5 Basic Settings
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.
Free-run Stop
b088
Selection
b003 Restart Standby Time
Frequency Matching
b007
Lower Limit Frequency
Frequency Pull-in
b028
Restart Level
Frequency Pull-in
b029
Restart Parameter
Starting Frequency
b030 Selection at Frequency
Pull-in Restart
5 - 44
Function name
00: 0-Hz restart
01: Frequency matching restart
02: Frequency pull-in restart
0.3 to 100.0
0.00 to 99.99
100.0 to 400.0
Heavy
load
(CT)
Light
load
(VT)
0.10 to 30.00
00: Frequency at shutoff
01: Max. frequency
02: Set frequency
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
Data
0.20 x Rated current to 2.00 x Rated
current (0.4 to 55 kW)
0.20 x Rated current to 1.80 x Rated
current (75 to 132 kW)
0.20 x Rated current to 1.50 x Rated
current
Default
Unit
data
00 –
1.0 s
0.00 Hz
Rated
current A
value
0.50 s
00 –