926 HEIDENHAIN Technical Manual iTNC 530 HSCI
Automatic test of
the motor brakes
upon switch-on
You can carry out an automated functional test of the motor brake after
switching on the drive, either before traversing the reference mark or through
activation by PLC Module 9143.
The operation and testing of motor-holding brakes must comply with
Information Sheet No. 005 "Gravity-loaded axes (vertical axes)" issued by the
engineering technical committee (BGM (German Employer's Liability
Association in the metal industry)).
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 torque (current) is applied while the brake is
active. 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
8140 No current for brake test <axis> appears.
Enter in MP2230.x a factor for the motor stall current with which the motor
brake test is to be carried out. If the test is not to be done, or for motors
without brakes, enter MP2230.x = 0.
The brake output on X392/X393 is also controlled if MP2230.x = 0.
The reference value for the factor from MP2230.x is the stall current I0
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
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
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 1,3
M
L
M
0
----------
⋅≥
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