986 HEIDENHAIN Technical Manual MANUALplus 620
Recommended input value for MP_testBrakeCurrent:
M
L
: Maximum load torque of the axis. In a standard case the holding torque of
a vertical axis is used here. It is to be ensured via activation of the brake that
a vertical axis does not fall down when the drive controllers are switched off.
M
0
: Stall torque of motor
Always keep in mind:
Torque for motor test ≥ 1.3 ⋅ maximum load torque of the axis
Stall torque of the motor ≥ maximum load torque of the axis
Holding torque of the motor brake ≥ torque for the motor test
Enter in MP_testBrakeTolerance the permissible path that the motor is
allowed to move against the brake.
To prevent standstill monitoring from responding, the following is required:
MP_testBrakeTolerance < MP_checkPosStandstill!
Recommended input value for MP_testBrakeTolerance:
α: Permissible braking angle: Backlash of the motor brake as per the
manufacturer specifications (for HEIDENHAIN motors, α ≤ 1°)
Example:
QSY 155B-EcoDyn: M
0
= 13 Nm, M
Br
= 40 Nm
M
L
= 11 Nm
MP1054.x (distance per motor revolution) = 20 [mm]
α = 1°
MP_testBrakeCurrent 1,3
M
L
M
0
----------
⋅≥
Please note that when reading the current via the internal oscilloscope on
the CC 61xx or UEC 11x you are seeing the effective value of the current.
Please note that the test torque can only be generated with a certain
factor of uncertainty. Factors of influence here are the accuracy of the
current sensors and the torque constant of the motor.
MP_testBrakeTolerance 2 α
MP_distPerMotorTurn
360°
---------------------------------------------------------------------------
⋅⋅=
MP_testBrakeCurrent 1.3
11 Nm
13 Nm
---------------------
⋅≥ 1.1=
MP_testBrakeTolerance 21°
20 mm
360°
----------------------
⋅⋅ 0.111 mm==
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