Drive functions
7.3 Function modules
Function Manual
214 Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Table 7- 25 Status message: Extended brake control
Signal name Parameter Brake status word
Command, open brake (continuous
signal)
r1229.1 B_ZSW.1
Pulse enable, extended brake control r1229.3 B_ZSW.3
Brake does not open r1229.4 B_ZSW.4
Brake does not close r1229.5 B_ZSW.5
Brake threshold exceeded r1229.6 B_ZSW.6
Value below brake threshold r1229.7 B_ZSW.7
Brake monitoring time expired r1229.8 B_ZSW.8
Request, pulse enable missing/n_ctrl
inhibited
r1229.9 B_ZSW.9
Brake OR logic operation result r1229.10 B_ZSW.10
Brake AND logic operation result r1229.11 B_ZSW.11
7.3.4.3 Description
The "Extended brake control" function allows complex braking control for e.g. motor holding
brakes and operational brakes.
The brake is controlled as follows (the sequence reflects the priority):
● Via parameter p1215
● Via binectors p1219[0...3] and p0855
● Via zero speed detection
● Via a connector interconnection threshold value
For an AC drive with "Safe Brake Relay," the "Safe Brake Control" safety function requires
that the type of the brake control be set in parameter p1278, to "Brake control with diagnostic
evaluation" (p1278 = 0).
7.3.4.4 Examples
Starting against applied brake
When the device is switched on, the setpoint is enabled immediately (if other enable signals
are issued), even if the brake has not yet been released (p1152 = 1). The factory setting
p1152 = r0899.15 must be disconnected here. The drive first generates torque against the
applied brake. The brake is not released until the motor torque or motor current (p1220) has
exceeded braking threshold 1 (p1221).
This configuration is used, for example, when the drive is connected to a belt that is under
tension (loop accumulator in the steel industry).
To Next Page
Loading...
Need help?
General
