Parameter
No.
Function name Data
De-
fault
data
Unit
E01 to
E05, E98,
E99
Input Terminal [DI1] to
[DI7] Function Selection
7: FRS (Free-run stop)
26: STM (Enable auto search for idling motor speed
at starting)
- -
For Normal Start (H441 = 0: Normal Start)
• Note that by a restart from the starting frequency (E152=3), the inverter operates suddenly while the
motor is operating by inertia. Use this setting if the motor stops soon due to the load after a free-run
stop.
Auto Search Restart (H441 = 1: Auto Search Restart)
• Auto search restart causes the inverter to anticipate the frequency from the voltage between the mo-
tor terminals in a free-run state and restart matched to that frequency. If the anticipated frequency is
not sufficient, the inverter restarts from 1st Starting Frequency (F23)/2nd Starting Frequency (A12).
•
With the RUN command ON, when the free-run state is canceled after the Auto Search Delay Time
2 for Starting Mode (H46) has elapsed since the free-run state, the auto search restart is started.
• The restart is performed at the starting frequency when Free Run Stop Restart Allowable Time
(H440) is set shorter than Auto Search Delay Time 2 for Starting Mode (H46).
• The examples below assume that the FRS terminal is used.
Auto Search Delay Time 2
for Starting Mode (H46)
Free Run Stop Restart
Allowable Time (H440)
FW
FRS terminal
Output frequency
(Motor rotation speed)
• When the anticipated frequency exceeds the Maximum Output Frequency (F03/A01) or the Fre-
quency Upper Limit (F15/E117), auto search restart is not performed, and the restart is performed
using the maximum frequency or the Frequency Upper Limit (F15/E117), whichever is lower.
Frequency Pull-in Restart (H441 = 2: Starting with Active Matching
Frequency)
• A frequency pull-in restart refers to the method of performing acceleration again to restart when the
frequency reference is output to the motor in a free-run state, and the frequency reference is decel-
erated by current limit until there is no longer a current limit. This enables a smooth restart inde-
pendent 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.
7 Other Functions
7-61
M1 Series Standard Type User's Manual (I669)
7-4 Restart Functions
7
7-4-5 Free Run Restart
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