Adjusting The S-Pm Geared Motor Starting Torque (Pr.785) - Mitsubishi Electric FR-E700EX Instruction Manual

Adjusting the output torque (current) of the motor
4.6.2

Adjusting the S-PM geared motor starting torque (Pr.785)

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
785
PM control torque boost
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.
 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.
Drive unit model
FR-E720EX-0.2K to 1.5K
FR-E720EX-2.2K, 3.7K
 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.
NOTE
 Keep the short-time torque to Pr. 785 setting or lower.
114
Name Initial value
S-PM motor capacity
0.1kW to 0.75kW
1.5kW, 2.2kW
Setting range
0 to 150%
9999
9999
Pr.785 setting
80% or less
50% or less
Description
Set the maximum torque to be generated
in the low-speed range of 300r/min or
less.
Set as 100%