Mitsubishi Electronics QD75D, QD75P [4] Setting the torque limit function

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MELSEC-Q
12 CONTROL SUB FUNCTIONS
[4] Setting the torque limit function
(1) To use the "torque limit function", set the "tor que limit value" in the
parameters shown in the following table, and write them to the QD75.
The set details are validated at the rising edg e (OFF ON) of the PLC
READY signal (Y0).
Setting item Setting
value Setting details Factory-set
initial value
Pr.17 Torque limit
setting value Set the torque limit value as a percentage. 300
Pr.54 OPR torque limit
value Set the torque limit value after the " Pr.47 Creep
speed" is reached. Set as a percentage. 300
Refer to Section 5.2 "List of parameters" for setting details.
(2) The "torque limit value" set in the QD75 is s et in the " Md.35 Torque limit
stored value". The "Md.35 T orque limit stored value" in the sequence
program is transferred to the "D/A converter m odule", and the torque is
limited.
PLC CPU Buffer memory Drive unit
Writing by a
TO command
Stored torque
limit value
826
D/A convertor module
Reading by a
FROM command
QD75
Torque limiting
Positioning control
Fig. 12.14 Limiting the torque to the drive unit (Axis 1)
The following table shows the "Md.35 Torqu e limit stored value" of the
buffer memory address.
Buffer memory address
Monitor item Monitor
value Storage details Axis
1Axis 2Axis 3Axis 4
Md.35 Torque limit stored
value
The "torque limit value" valid at that time is
stored. ( Pr.17 , Pr.54 , or Cd.22 )826 926 1026 1126
Refer to Section 5.6 "List of monitor data" for information on the setting details.
REMARK
•Parameters are set for each axis.
•It is recommended that the parameters be set wh enever possible with GX
Configurator-QP. Execution by sequence program uses many sequence programs
and devices. The execution becomes com plicated, and the scan times will
increase.