784 HEIDENHAIN Technical Manual MANUALplus 620
6.14.3 Brake test for synchronized axes
As a prerequisite for the brake test of a synchronized axis, all servo drives of
the axis must be switched on and the brakes must be open. The test can only
be performed if all relevant servo drives are switched on.
The brake test is activated (> 0) or deactivated (= 0 or parameter deleted)
separately for each servo drive via MP_testBrakeCurrent.
An additional test torque is applied to the servo drive during the brake test. You
define this test torque via a multiplier for the motor stall current with
MP_testBrakeCurrent, see "Automatic test of the motor brake" on page 985.
This test torque exerts additional load on the holding brake of the servo drive.
The axis is prevented from moving during the brake test and the brake test is
considered to have been passed only if the brake withstands this load.
HEIDENHAIN recommends:
The MANUALplus 620 runs the brake test for synchronized axes as follows:
Behavior during the brake test of synchronized axes:
The function reads the machine configuration to detect which servo drives are
operated together as a synchronized axis and which must therefore be
handled separately in the brake test. CfgAxisCoupling is used to configure
servo drives to a synchronized axis. The brakes and drives of the synchronized
axis are tested simultaneously. It is ensured, however, that the same algebraic
sign is used for the test torque of all drives.
The sign is determined for all servo drives of the synchronized axis based on
the entry for the holding torque of the master in MP_compCurrentOffset
(401405). If no value is entered in MP_compCurrentOffset, the current
holding torque of the master is used.
Before performing the brake test, ensure via the PLC program that all servo
drives of a synchronized axis are switched on and the holding brakes are
open.
Note the constraints for the brake test of synchronized axes and adapt
your PLC program to the conditions.
Test the behavior of the PLC program and the brake test on the machine.
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