Constraints For The Brake Test - HEIDENHAIN iTNC 530 HSCI Technical Manual

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Constraints for the brake test:

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.
Note
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.
For slave drives for which the brake test has been disabled via MP2230.x, the
current is adjusted so that the servo drive is not moved while the other servo
drives of the synchronized axis are being tested.
Since the algebraic sign of the test torque cannot be determined until the
drives are feedback-controlled and the brakes are open, an appropriate waiting
time must be specified for the start of the brake test of synchronized axes. The
time set in MP2309.x is used for this. The value for MP2309.x must equal the
time that passes until the brake is really open after the controller has been
switched on. The same time must be entered in MP2309.x for all servo drives
of a synchronized axis. For CC 424 and CC 6xxx controller units the time in
MP2309.x is taken into account each time the controller is switched on. For
CC 422 controller units the time in MP2309.x is only taken into account the
first time the controller is switched on, in order to delay the brake test by this
time.
In general, the following applies to the brake control: If the brakes are
controlled by the PLC, and not by the inverters, the PLC module 9159 (drive
controllers are switched off) transmits the status message to the PLC program
regarding the closing of the brakes during the brake test. However, also
remember the relationship with PLC Module 9162. The status signal of PLC
Module 9162 returns a value of "1" if the drive is ready.
HEIDENHAIN Technical Manual iTNC 530 HSCI