Lenze EVS9332xK - Manual (Page 91)

Function library
Function blocks
3.2.16 Holding brake (BRK)
3−63
l
EDSVS9332K−EXT EN 4.0
3.2.16.1 Engaging the brake
Purpose A HIGH signal at the BRK1−SET input
activates the function. The output
BRK1−QSP is simultaneously switched
to HIGH. This signal can be used to
decelerate the drive to zero speed via a
deceleration ramp.
t
t
BRK1−SET
MCTRL−NSET2
t
BRK1−OUT
BRK1−CINH
|BRK1−Nx
|
C0195
t
BRK1−QSP
t
Function If the setpoint speed falls below the
value set at the BRK1−Nx input, the
output BRK1−OUT is set to HIGH. In
order to ensure a fail−safe design this
signal must be inverted at the output
(e.g. via C0118).
3.2.16.2 Disengaging (releasing) the brake
Purpose A LOW signal at the BRK−SET input
immediately sets the BRK−CINH output
to LOW. At the same time the
BRK1−M−STORE output is set to HIGH.
This signal can be used to generate a
defined torque against the brake. The
drive thus takes over the torque while
the brake is released. The signal is only
reset after the time set under C0196
has elapsed.
t
t
BRK1−SET
MCTRL−NSET2
BRK1−OUT
BRK1−CINH
MCTRL−MACT
MACT = C0244
C0196
t
t
BRK1−M−STORE
t
BRK1−QSP
t
t
Function As soon as the torque reaches the
value set under C0244 (holding torque),
the output BRK1−OUT is set to LOW.
When the input is reset, a timing
element is triggered. After the time set
under C0196 has elapsed the
BRK1−QSP output is reset. This signal
serves to e.g. release the setpoint
integrator after the brake release time
has elapsed.
Note If an actual speed higher than the value at BRK1−Nx is detected before the brake release time (C0196) has elapsed, the
signals BRK1−QSP and BRK1−M−STORE are reset immediately. The drive can operate in a speed or angle−controlled
manner immediately. If the BRK1−QSP output acts on the QSP control word, then the drive is synchronised to the actual
speed and follows its setpoint.