July 2013 6.11 Monitoring functions 925
6.11.13 Controlling the motor brakes
The motor brakes are controlled with the BRK
braking signal, which is
transmitted to the HEIDENHAIN inverters via the PWM interface (X51 to
X62). The corresponding outputs are activated there. See the basic circuit
diagrams.
Control of the motor brakes via the PWM interface must be deactivated for
non-HEIDENHAIN inverters that do not support this function:
Set MP2230.x = 0
The motor brakes are opened no later than 50 ms after the speed controller is
switched on. For safety reasons, the controller is not switched off until the
braking signal has been output:
Enter in MP2308.x the time (overlap time) after which the controller is to be
switched off (after the braking signal has been output).
If the inverter sends the RES.PS
reset signal, then the BRK braking signals are
output immediately upon switch-off of the controllers, i.e. without any overlap
time.
Activated brakes cause a change in the controlled system. The motor with the
changed controlled system is controlled during the overlap time. This can lead
to oscillations when the controller is switched off. These oscillations are
suppressed by the NC software. MP2220 bit 3 can be used to deactivate the
suppression of vibrations. HEIDENHAIN does not recommend switching off
the suppression of the oscillations.
In MP2309.x you can define a time period in which the speed and position
controller parameters are adjusted to values for controlling a closed brake
when the drive is switched on. This parameter can be used to avoid
oscillations in the drive during switch-on when the brake is still closed and the
controller is already active.
MP2220 Monitoring functions
Input: Bit 3 – Switching off the controller when the motor brakes are
activated
0: Suppress oscillations
1: Oscillations are allowed
MP2308.x Time between output of the braking signal BRK
and
switching off of the controller (overlap time)
Input: 0.001 to 5.000 [s]
0: 0.200 s
MP2309.x Controller parameters adjusted to closed brake
Input: 0: Previous behavior; not active
0.001 to 5.000 [s]
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