Mitsubishi Electronics QD75P, QD75D user manual When limiting the torque at, Pr.17

12CONTROL SUB FUNCTIONS

[2]Control details

MELSEC-Q

The following drawing shows the operation of the torque limit function.

Various operations

PLC READY signal [Y0]

Pr.17 Torque limit setting value

Cd.22 New torque value

Md.35 Torque limit stored value

100%	50%
0%	0%
Torque limited at the parameter			Torque limited at the parameter
torque limit setting value (100%)			torque limit setting value (50%)
100%		50%

Fig. 12.13 Torque limit function operation

[3]Precautions during control

(1)When limiting the torque at the "

Pr.17

Torque limit setting value", confirm

that "

Cd.22

New torque value" is set to "0". If this parameter is set to a

value besides "0", the "

Cd.22

New torque value" will be validated, and the

torque will be limited at that value. (Refer to Section 12.5.4 "Torque change function" for details about the "new torque value".)

(2)When the “ Pr.54 OPR torque limit value “exceeds the “ limit setting value”, an error occurs. (Error code: 995)

Pr.17

Torque

(3)When limiting the torque, a D/A converter module and drive unit in which torque limit commands by analog voltage are possible.

(4)When the operation is stopped by torque limiting, the droop pulse will remain in the deviation counter. If a "deviation counter clear" is carried out by issuing an external signal at this time, positional deviation will occur when the operation is continued. If the load torque is eliminated, operation for the amount of droop pulses will be carried out.

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