8.3 EXTERNAL BRAKE CONTROL WITH ADDITIONAL LIMITS (IDS 315, 316, 346
TO 349, 352, 353)
The external brake used for additional braking can be controlled through parameters ID315,
ID316, ID346 to ID349 and ID352/ID353. Selecting On/Off Control for the brake, defining the
frequency or torque limit(s) the brake should react to and defining the Brake-On/-Off delays
will allow an effective brake control.
NOTE!
During Identification Run (see parameter ID631), brake control is disabled.
Torque limit
ID349
Frequency limit
ID347
START
STOP
Brake-off
delay;
ID352
Brake-on delay;
ID352
Brake off
Brake on
Fig. 92: Brake control with additional limits
In 21 above, the brake control is set to react to both the torque supervision limit (parameter
ID349) and frequency supervision limit (ID347). Additionally, the same frequency limit is used
for both brake-off and brake-on control by giving parameter ID346 the value 4. Use of two
different frequency limits is also possible. Then parameters ID315 and ID346 must be given
the value 3.
Brake-off: In order for the brake to release, three conditions must be fulfilled: 1) the drive
must be in Run state, 2) the torque must be over the set limit (if used) and 3) the output
frequency must be over the set limit (if used).
Brake-on: Stop command activates the brake delay count and the brake is closed when the
output frequency falls below the set limit (ID315 or ID346). As a precaution, the brake closes
when the brake-on delay expires, at the latest.
NOTE!
A fault or Stop state will close the brake immediately without a delay.
VACON · 368 PARAMETER DESCRIPTIONS
8
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