I.8 Grounding system
AGND — ground for analog inputs/outputs, internal analog ground
DGND — ground for digital inputs/outputs, optically isolated
XGND — ground for external 24V aux. voltage, optically and inductively isolated
PGND — ground for encoder emulation, RS232, CAN, optically isolated
The potential isolation is shown in the block diagram (ð I.5).
I.9 Control for motor-holding brake
A 24V / max. 2A holding brake in the motor can be controlled directly by the servo amplifier.
This function does not ensure personnel safety! The brake function must be enabled through the
BRAKE parameter: setting WITH. In the diagram below you can see the time and functional
relationships between the ENABLE signal, speed setpoint, speed and braking force.
During the internal ENABLE delay time of 100ms the speed setpoint of the servo amplifier is
internally driven down a 10ms ramp to 0V. The brake output is switched on when 3% of the final
speed is reached. The rise (fbrH) and fall (fbrL) times of the holding brake which is built into the
motors are different for the various types of motor (see motor manual). A description of the
interface can be found in Chapter III.2 .
A safe (for personnel) operation of the holding brake requires an additional “make” (n.o.) contact
in the brake circuit and a suppressor device (varistor) for the recommended brake circuit diagram :
- A.4.031.3/01, 1/35
SERVOSTAR™ 600 Installation-manual 17
Kollmorgen
02.99 - A.4.031.3/01, 1/35
General
external
safety circuit
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