Operating instructions

Functions
5.10 Technological functions
CU240S and CU240E Control Units, FW 3.2
138 Operating Instructions, 03/2009, A5E02440075B AA
4. Parameterize the opening and closing times of the motor holding brake
It is extremely important that electromechanical braking is controlled with the correct
timing (brake release time, brake closing time, release time) to protect the brakes against
long-term damage. The exact values can be found in the technical data of the connected
brake. Typical values:
– Brake release times are between 35 ms and 500 ms
– Brake closing times are between 15 ms and 300 ms
– Release times are between 25 ms and 230 ms
5. Restore the motor holding brake control
– The mechanical brake is connected to the inverter via the Brake Relay. Bit 12 "Brake
active" of status signal r0052 controls the brake.
– It is not sufficient to simply select status signal r0052 bit 12 in P0731 to P0733 (relay
outputs). To activate the motor holding brake, parameter P1215 must be additionally
set to 1.
When a motor with a built-in holding brake is commissioned, a "clicking" sound in the motor
indicates that the brake has been properly released.
Table 5- 55 Control logic parameters of the motor holding brake
Parameters Description
P0003 = 2 Enables extended parameter access
P1215 = … Enable motor holding brake
0 Motor holding brake locked (factory setting)
1 Motor holding brake enabled
P0731= 52.C BI: Function digital output 1
Note:
To control the Brake Relay via the digital output, the following must apply, e.g. for
digital output 1: P0731 = 52.C = 52.12
P0346 = … Magnetizing time time
0 ... 20 s, factory setting 1 s
P1080 = … Minimum frequency
0 … 650 Hz, (0 Hz factory setting): minimum motor frequency, regardless of
frequency setpoint
P1216 = … Delay time for opening the brake
0 ... 20 s, factory setting 0.1 s
Note: P1216> brake release time + relay opening time
P1217 = … Holding time after runout
0 ... 20 s, factory setting 0.1 s
Note: P1217> brake closing time + relay closing time
P1227 = … Zero value detection monitoring time
0 ... 300 s, factory setting 4 s
r0052.12 "Brake active" status
Opening the motor holding brake via P1218
Using parameter P1218, you can force the brake to open, e.g. in order to be able to
manually move a conveyor drive.
P1218 is ignored if the motor holding brake is closed because of an STO.