894 HEIDENHAIN Technical Manual MANUALplus 620
6.16.19 Power and torque limiting
The parameter object CfgServoMotor is not required for:
Virtual axes (MP_axisMode = Virtual)
Axes that are for display only (MP_axisMode = Display)
Analog axes (MP_axisHw = Analog)
You can limit the power of your spindle motor to achieve wider gear ranges.
Wide-range motors are characterized by a larger speed range with higher
torque at low speed.
One solution for bringing about this behavior is to use an oversized motor, and
to limit the maximum power. However, power limiting does not reduce the
high torque to the speed at which power limiting becomes effective. This high
torque (until power limiting takes effect) can be reduced with torque limiting,
in order to keep the mechanics of the machine from becoming overloaded.
With torque limiting you can also limit the torque of the axis motors, in order
to keep the mechanics of the machine from becoming overloaded. Power
limiting is not useful for axis motors.
For axes and spindles, the torque is limited to the value taken from either the
table of power modules or the motor table, whichever is lower.
On supply units where the ERR.IZ.GR
signal is available, the power is limited
via MP_motPMax in case of error.
HEIDENHAIN recommends activating this monitoring function (not with
UE 2xx).
The torque can be calculated for any speed:
M: Torque [Nm]
P: Power [W]
n: Speed [min
–1
]
Settings in the configuration editor MP number
Axes
ParameterSets
[Key name of the parameter set]
CfgServoMotor
motEncCheckOff – Bit2
motPMax
motMMax
401303
401308
401310
M
P 60⋅
n 2 π⋅⋅
----------------=
The power and torque limiting can have an effect on the braking of the
spindle in an emergency stop.
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