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Adjusting the output torque (current) of the motor
4.6.2 Adjusting the S-PM geared motor starting torque (Pr.785)
For Pr. 785, set the maximum torque to be generated in the low-speed range of 300r/min or less.
Set a large value to generate a large starting torque.
To operate continuously at a low speed of less than 300r/min, a current must flow regardless of load. Thus, motor
overload trip (E.THM) may occur with a certain operation period even if no load is applied.
To operate continuously at a low speed of less than 300r/min, set the following or lower values in Pr. 785.
In the low speed range of 300r/min or less, Pr. 22 Torque limit level is disabled. Thus, a drive unit failure, such as the
overcurrent protection and the loss of synchronism detection, may occur when a torque equal to or larger than the Pr. 785
setting is applied.
When a S-PM geared motor is used, reduction of the motor torque in the low-speed range (lower than 300 r/min) can
be improved.
Parameter
number
Name Initial value Setting range Description
785
PM control torque boost
9999
0 to 150%
Set the maximum torque to be generated
in the low-speed range of 300r/min or
less.
9999 Set as 100%
The above parameters can be set when Pr.160 Extended function display selection = "0". (Refer to page 182)
The above parameters are available with S-PM geared motors.
......Specifications differ according to the date assembled. Refer to page 316 to check the SERIAL number.
Drive unit model S-PM motor capacity Pr.785 setting
FR-E720EX-0.2K to 1.5K 0.1kW to 0.75kW 80% or less
FR-E720EX-2.2K, 3.7K 1.5kW, 2.2kW 50% or less
NOTE
Keep the short-time torque to Pr. 785 setting or lower.