HEIDENHAIN iTNC 530 Service Manual page 685

You can carry out an automated functional test of the motor brake after switching on the drive,
Automatic test of
either before traversing the reference mark or through activation by PLC Module 9143.
the motor brakes at
switch-on
This brake test only functions in combination with HEIDENHAIN inverter systems and only when
using the brake output on X392/X393 if it is wired according to the basic circuit diagram from
HEIDENHAIN.
For the period of one second, a current is output while the brake is applied. The path that the
axis has moved is then measured. If the permissible path is exceeded, the error message
8130 Motor brake defective <axis> appears, and the axis remains controlled. The test is carried
out simultaneously for all affected axes.
If no motor current flows while testing the motor brakes, the error message 8310 No current
for brake test <axis> appears.
The I0 standstill current is used as motor current entered in the motor table. If I0 in the motor
table equals 0, then the rated current I-N from the motor table is used.
Recommended input value for MP2230.x:
M
M
Always keep in mind:
July 2010
DANGER
If the machine were switched off in case of an error, vertical axes could fall down!
This could lead to damage to property or persons!
In case of an error, the axis must be moved to a safe position, and physically supported, if
necessary. Only then may the machine be switched off so that the defect can be corrected!
MP2230.x contains a factor for the motor current with which the test of the motor brake
should be performed. MP2230.x = 0 if the test is not to be performed or for motors without
brakes.
M
L
≥ ⋅
------- -
MP2230.x 1,3
M
0
: Maximum torque of the axis
L
: Standstill torque of the motor
0
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
Note
Please note that when reading the current via the internal oscilloscope, on the CC 422 you
are seeing the peak value, and on the CC 424 (B) 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.
MP2232.x contains the permissible path that the motor is allowed to move against the brake.
MP2232.x = 0 if the test is not to be performed or for motors without brakes.
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