July 2013 6.6 Gantry/synchronized axes 793
Alternative behavior:
Testing the brakes of a synchronized axis successively
MP860 bit 2 can activate a changed brake test sequence. If MP860 bit 2 = 1,
the servo drives of a synchronized axis are tested successively rather than
simultaneously. As a result, the brake test is performed individually for all
servo drives of a synchronized axis.
All brakes and servo drives of the synchronized axis are tested successively,
one after the other, at the specified test current. For the brakes and servo
drives that are not part of the momentary test, but are configured as
connected to the servo drive to be tested, the current is set during the test so
that the servo drive is not moved. The brakes of these servo drives must be
open for this purpose. This way, each time only the brake of an individual servo
drive is tested, without the other servo drives or brakes of the synchronized
axis having an effect on the test.
To be able to use this brake test sequence, the individual brakes of the
synchronized axis must not be combined. It must be possible to control the
brakes individually.
There are also two possibilities for starting the brake test. In both cases the
function described above is used to test the brakes of synchronized axes
sequentially:
Automatic brake test
The brake test takes place automatically during the power-up test of the
control, as soon as all servo drives of the respective synchronized axis have
been switched on.
Brake test via PLC module
The brake test can be activated axis-specifically by the PLC program with
PLC module 9143. What is new in the below-mentioned service packs is
that the slave drives of a synchronized axis are tested successively after the
master. Previously it was not possible to perform the brake test of slave
drives via the PLC module. 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.
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