Omron M1 Series User Manual page 544

7 Other Functions
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 (E152)). If you select starting
from pull-in frequency, normal start may not be performed, or the device may be damaged.
Startup Characteristics Selection STM
Allocate "26: STM (Enable auto search for idling motor speed at starting)" to Input Terminal [DI1] to
[DI7] Function Selection (E01 to E05, E98, E99).
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
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.
Frequency setting
Motor speed
Estimated motor speed
At a startup as a result of the RUN command turning ON, the auto search is started after a delay by
the time set at Auto Search Delay Time 1 for Starting Characteristic (H49). When control of a motor is
alternately switched between two inverters, and the motor is started by an auto search after a free run
during switching, the RUN command does not need to be issued in a timely manner by setting H49.
Restart Mode after Momentary Power Failure (Basic Operation:
Without Auto Search Setting)
When the inverter detects that the Main Circuit DC Voltage has dropped below the undervoltage level
during operation, it judges a momentary power failure.
After the restoration of power, the inverter is set to the operation ready completion state once the initial
charging time has elapsed.
7-52
OFF Auto search disabled
ON Auto search enabled
Auto Search
Delay Time 1
for Starting
Characteristi
c (H49)
"STM"
"FWD"
Operation
Approx. 1.2 s max.
M1 Series Standard Type User's Manual (I669)