Brake Control - KEB COMBIVERT F4-F Applications Manual

Special Functions
6.8 Special
Functions

6.8.1 Brake Control

Basic settings
Application time (LE.68)
Release time (LE.67)
Speed hysteresis (LE.37)
Delay time (LE.66)
© KEB Antriebstechnik, 1999
All Rights reserved
The KEB COMBIVERT F4-F offers the possibility of controlling a holding brake. To
activate the brake control an external digital output must be assigned with the function
(do.1...do.8 = value „32"). The adaption of the release and delay time to the employed
brake is done with LE.67 and LE.68. To prevent the engagement of the brake in case
of fast successive positionings a delay time (LE.66) can be adjusted. So as to avoid
that oscillations of the drive during standstill prevent the activation of the brake a
speed hysteresis (LE.37) can be adjusted.
For the activation of the brake control following basic settings should be made:
1. Assign the function „Brake control" (value „32") to the digital output.
2. Adjust the application time LE.68 according to the data sheet of the brake. The
application time defines the time from the triggering of the brake until the safe
load transfer. This means for the inverter that the modulation is switched off
only after the expiration of the application time. Setting range: 0...5000 ms,
default 0ms.
3. Adjust release time with LE.67 according to the data sheet of the brake. The
release time defines the time from triggering the brake until the complete release
and can be adjusted in the range of 0...5000ms (default 0ms). This means for
the inverter
- after setpoint setting the modulation is enabled but the setpoint value is still
maintained on 0 min
- the brake is released, the drive takes over the load
- if no error occurs the setpoint is enabled after expiration of the release time.
4. The speed hysteresis is active durting the delay time (see next page). If the
hysteresis is exceeded during the delay time the delay time starts again. The
speed hysteresis can be adjusted in a range of 0...9999,5 min
-1
10 min ).
The delay time prevents the unnecessary engagement of the brake, e.g. in case of
fast successive positioning commands.
If all other conditions for the engagement of the brake are met, the delay time starts.
During this time the drive can restart immediately with a new setpoint value or drive
command. After expiration of the delay time the brake engages irrevocably. A new
setpoint value or drive command can now only be given after expiration of the
application and release time. The delay time is adjustable in the range of 0...65535ms
(default 0ms).
Name: Basis
KEB COMBIVERT F4-F
Functional Description
-1
Date
19.05.99
ANTRIEBSTECHNIK
-1 (default
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