S748-772 Instructions Manual | 7 Technical description
7.3 Motor holding brake
A 24 V holding brake in the motor can be controlled directly by the amplifier. A special 24 V
supply voltage (X9B) is used. Brakes with up to 3 A can be controlled directly.
No functional safety!
Danger by falling load (in case of suspended load, vertical axes). An additional mechanical
brake is required for functional safety, which must be safely operated, e.g. via the Safety
Card S1-2 (➜ # 155).
The brake only works with sufficient voltage level (➜ # 31). Check voltage drop, measure
the voltage at brake input and check brake function (brake and no brake).
The brake function must be enabled through the BRAKE setting (screen page: Motor). In the
diagram below you can see the timing and functional relationships between the ENABLE sig-
nal, speed setpoint, speed and braking force. All values can be adjusted with parameters, the
values in the diagram are default values.
During the internal ENABLE delay time of 100 ms (DECDIS), the speed setpoint of the servo
amplifier is internally driven down along an adjustable ramp to 0V. The output for the brake is
switched on when the speed has reached 5 rpm (VELO), at the latest after 5 s (EMRGTO).
The release delay time (tbrH) and the engage delay time (tbrL) of the holding brake that is built
into the motor are different for the various types of motor (see motor manual), the matching
data are loaded from the motor database when the motor is selected. A description of the
interface can be found on page (➜ # 73).
34 Kollmorgen | kdn.kollmorgen.com | July 2019
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