Toshiba TOSVERT VF-MB1 Instruction Manual page 157

2) Restarting motor during coasting (Motor speed search function)
Motor speed
Forward / reverse
Setting f301 to 2 o r 3 : This function operates after the ST-CC terminal connection has been opened
first and then connected again.
Note 1: The terminal function ST needs to be assigned to an input terminal, using the parameters  to
 .
3) Motor speed search at starting
When f301 is set to 4 , a motor speed search is performed each time operation is started.
This function is useful especially when the motor is not operated by the inverter but it is running because of
external force.
Warning!!
 At restart, it takes about 1 second for the inverter to check to see the number of revolutions of the
motor.
For this reason, the start-up takes more time than usual.
 Use this function when operating a system with one motor connected to one inverter.
This function may not operate properly in a system configuration with multiple motors connected to
one inverter.
 In case of using this function, do not set the output phase failure detection selection
( f605 = 1 , 2 , 4 ).
Application to a crane or hoist
The crane or hoist may have its load moved downward during the above waiting time
from input of the operation starting command to the restart of the motor. To apply the
inverter to such machines, therefore, set the auto-restart control mode selection
parameter to "=" (Disabled), Do not use the retry function, either.
Note 2: It is not malfunction that abnormal noise might be heard from the motor during the motor speed
search at the auto-restart.
ST-CC
F-37
E6581697
ON
OFF
ON
OFF
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