Technical data

Appendix
CPU 317T: Technology Functions
A-24 A5E00251798-03
A.3.2.3 Torque settings
The FBs MC_SetTorqueLimit and MC_MoveToEndPos (not with detection based
on following error) can be used to reduce the torque of the drive motor. The torque
is specified in N/m. The reference torque of the motor is set in the
"TypeOfAxis.SetPointDriverInfo.DriveData.maxTorque" configuration data.
Percentage of reduction
To override the absolute value with a torque reduction percentage, set the
reference torque to 100.0 N/m:
Configuration data: TypeOfAxis.SetPointDriverInfo.DriveData.maxTorque = 100.0
N/m
When you set the parameter MaxTorque = 25.0 at the call of MC_SetTorqueLimit,
the maximum torque of the motor is reduced to 25 %.
Load conversion
The motor torque can be converted into a load torque value, while making
allowances for the gear load and spindle gradients. There is no allowance made for
frictional losses in the following.
Rotary axes:
Motor
DN
NM
MM
MotorLoad
⋅=
NM
DN
M
Motor
M
Load
Gear
Linear axes (here, the force is calculated):
Motor
NM
DN
M
Motor
M
Load
Gear
DX
F
Load
DX
DN
NM
MF
MotorLoad
π
2
⋅⋅=
M
Motor Drive motor torque in [N/m]
M
Load Torque at the load side of the gears in [N/m]
F
Load Load force in [N]
NM Motor rotations
DN Number of load rotations
DX Load feed per rotation (e.g. spindle pitch) in [m]