6: Decelerate-to-
stop (w/o trip)
If a momentary power failure occurs while the inverter is operating and the Main Circuit
DC Voltage of the inverter falls below the continuous running level, the deceleration stop
control is started. During deceleration stop control, the kinetic energy of the moment of
inertia of the load is regenerated due to deceleration, and the deceleration operation
continues. An alarm does not occur after a deceleration stop.
If the RUN command turns OFF in the deceleration stop state, the deceleration stop
state is canceled, and the operation can be performed when the RUN command turns
ON the next time.
*1. With auto search is selected when Enable auto search for idling motor speed at starting “STM” is ON, or
Motor Starting Mode Auto Search Function Selection (3008Hex-0AHex/3014Hex-44Hex) = 1 or 2.
When a motor control method with speed sensor is selected, restart is performed from the motor speed de-
tected by the speed sensor. In the case of a motor control method without speed sensor
, restart is per-
formed from the estimated speed.
Additional Information
When using vector control without speed sensor, do not use restarting from the pull-in frequen-
cy (Starting Frequency Selection at Frequency Pull-in Restart (301FHex-35Hex)). If you select
starting from pull-in frequency, normal start may not be performed, or the device may be dam-
aged.
Startup characteristics selection STM
Allocate “26: STM (Enable auto search for idling motor speed at starting)” to Input Terminal [DI1] to
[DI7] Function Selection (3005Hex-02Hex to 3005Hex-06Hex, 3005Hex-63Hex, 3005Hex-64Hex).
This function is used to select whether or not to perform the auto search operation (auto search with-
out stopping the motor during idling) when the inverter is started by turning the STM terminal ON or
OFF.
Startup characteristics selection STM Operation
OFF Auto search disabled
ON Auto search enabled
By a startup with auto search enabled, the speed at startup will be searched (for a maximum of ap-
prox. 1.2 seconds) as an auto search without stopping the motor during idling is performed. After a
speed search, acceleration is performed up to the set frequency in accordance with the set accelera-
tion time.
Approx. 1.2 s max.
Auto Search
Delay Time 1 for
Starting
Characteristic
(3008Hex-32Hex)
Frequency setting
Motor speed
Estimated motor speed
“STM”
“FWD”
8 Other Functions
8-44
M1 Series EtherCAT Type User’s Manual (I670)
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