12 - 28
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
(2) Control details
The following drawing shows the operation of the torque limit function.
Various operations
PLC READY signal [Y1D]
50%100%
75%
0%0%
75% 50%
Torque is limited at the torque output
setting value (75%) of the axis control
data.
New torque valueCd.30
Cd.101Torque output setting value
Torque is limited at the torque
output setting value (25%) of
the axis control data.
25%
25%
Pr.18 Torque limit setting value
Md.45 Torque limit stored value
Torque is limited at the torque
limit setting value (50%) of the
parameter.*
*: Since the " Torque output setting value" is greater than the " Torque limit setting value", the torque is limited at the " Torque limit setting value".
Cd.101
Pr.18
Pr.18
Fig. 12.14 Torque limit function operation
(3) Precautions during control
(a) When limiting the torque at the "
Cd.101
Torque output setting value",
confirm that the "
Cd.30
New torque value" is set to "0". If this axis control
data is set to a value other than "0", the "
Cd.30
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 of the "new torque value".)
(b) When the operation is stopped by torque limiting, the droop pulses will
remain in the deviation counter. When the load torque is eliminated,
operation for the amount of droop pulses will be carried out.
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