Brake Test For Synchronized Axes - HEIDENHAIN iTNC 530 HSCI Technical Manual

6.6.3 Brake test for synchronized axes

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The brake test is activated (> 0) or deactivated (= 0) separately for each servo
motor via MP2230.x. During the brake test, an additional test torque from
MP2230.x, defined via a multiplier, is applied to the motor stall current. 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.
The iTNC 530 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. Machine parameter MP850.x is used to
configure the servo drives as a synchronized axis. The brakes and servo 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 servo 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 MP2630.x. If no value is
entered in MP2630.x, the current holding torque of the master is used.
There are two possibilities for starting the brake test. In both cases the
function described above is used to test the brakes of synchronized axes
simultaneously:
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 service packs listed below is that the
slave drives of a synchronized axis are tested simultaneously with 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.
HEIDENHAIN Technical Manual iTNC 530 HSCI