January 2012 6.17 Monitoring Functions 983
6.17.11 Motor brake
The parameter objects CfgSpeedControl and CfgServoMotor are not required
for:
Virtual axes (MP_axisMode = Virtual)
Axes that are for display only (MP_axisMode = Display)
Analog axes (MP_axisHw = Analog)
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. Registered customers can download the current basic circuit
diagram from the "HESIS-Web Including Filebase" on the Internet (http://
hesis.heidenhain.de).
Control of the motor brakes via the PWM interface must be deactivated for
non-HEIDENHAIN inverters that do not support this function.
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 MP_vCtrlSwitchOffDelay 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. MP_motEncCheckOff bit 3 can be used to
deactivate the suppression of the oscillations. HEIDENHAIN does not
recommend switching off the suppression of the oscillations.
In MP_vCtrlSwitchOnDelay 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.
Settings in the configuration editor MP number
Axes
ParameterSets
[Key name of the parameter set]
CfgSpeedControl
vCtrlSwitchOffDelay
vCtrlSwitchOnDelay
CfgServoMotor
motEncCheckOff – Bit3
400927
400929
401303
To Next Page
Loading...
