Extended Brake Control - Siemens SINAMICS S120 Function Manual

Function modules

7.4 Extended brake control

7.4 Extended brake control
Features
The extended brake control function has the following features:
● Forced brake release (p0855, p1215)
● Application of brake for a 1 signal "unconditionally close holding brake" (p0858)
● Binector inputs for releasing/applying the brake (p1218, p1219)
● Connector input for threshold value for releasing/applying the brake (p1220)
● OR/AND block, each with two inputs (p1279, r1229.10, p1229.11)
● Holding and operational brakes can be activated.
● Function for monitoring brake feedback signals (r1229.4, r1229.5)
● Configurable responses (A7931, A7932)
● Application of brake after "Enable speed controller" signal has been canceled (p0856)
Description
The "Extended brake control" function allows complex braking control for 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 must be set, in parameter p1278, to "Brake control with
diagnostic evaluation" (p1278 = 0). This parameter is automatically set for booksize
components.
Commissioning
The extended brake control function is activated while the commissioning wizard is running.
Parameter r0108.14 indicates whether the function module has been activated.
Unless you change the default settings, the extended brake control function behaves in
exactly the same way as the simple brake control function.
Brake control will be activated automatically (p1215 = 1) when the Motor Module has an
internal brake control and a connected brake has been found.
If no internal brake control is available, the control can be activated using a parameter
(p1215 = 3).
256
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions