Omron MX2 Series User Manual page 216

5 Basic Settings
02: Frequency pull-in restart
Causes the inverter to restart by outputting the starting frequency set in the Starting Frequency
Selection at Frequency Pull-in Restart (b030) to the motor in a free-run stop state and re-acceler-
ating when the Frequency Pull-in Restart Level (b028) is reached.
This enables a smooth restart independently 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. In this case, set the Restart Standby
Time (b003) to a long time.
• While in a free-run stop state, the motor is not subject to external influence because the inverter out-
put is shut off.
Even if the motor is stopped by 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 and an overvoltage may be detected. In this case, use the regenerative braking
function.
Parameter
No.
b088 Free-run Stop Selection
b003 Restart Standby Time
Frequency Matching
b007
Lower Limit Frequency
Frequency Pull-in Restart
b028
Level
Frequency Pull-in Restart
b029
Parameter
Starting Frequency Selec-
b030 tion at Frequency Pull-in
Restart
Multi-function Input S1 to
C001 to
C007
S7 Selection
• The details of the Starting Frequency Selection at Frequency Pull-in Restart (b030) are shown below.
Set value
00 Frequency at interruption
01 Maximum Frequency
02 Set frequency
• 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.
5 - 40
Function name
00:
01:
02:
0.3 to 100.0
0.00 to 99.99
100.0 to 400.0
Heavy
load
(CT)
Light
load
(VT)
0.1 to 999.9
1000. to 3000.
Set the deceleration rate for the output frequency
during frequency pull-in restart.
Set the deceleration time from the maximum fre-
quency to 0 Hz.
00:
01:
02:
11:
Content
Executes pull-in restart from frequency at which inverter output is shut
off.
Executes pull-in restart from maximum frequency.
Executes pull-in restart from set frequency reference.
Data
0-Hz restart (Example 1)
Frequency matching restart (Example 2)
Frequency pull-in restart (Example 3)
0.20 × Rated current to 2.00 × Rated
current
0.20 × Rated current to 1.50 × Rated
current
Frequency at interruption
Maximum Frequency
Set frequency (Frequency reference)
FRS (Free-run stop)
Description
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Default
Unit
data
−
00
1.0 s
0.00 Hz
Rated
current A
value
0.5 s
−
00
− −