Lenze EVS 9300 series - Page 199

Function library
Function blocks
9.2.14 Holding brake (BRK)
9-73
L
EDSVS9332S-D11 EN 3.0
9.2.14.1 Applying the brake
Purpose A HIGH-Signal at the BRK-SET input
activates the function. The BRK-QSP
output is simultaneously set to HIGH.
This signal can be used to decelerate
the drive to zero speed via a
deceleration ramp.
t
BRK-SET
MCTRL-NSET2
|
B
R
K
N
|
t
BRK-QSP
Function If the setpoint speed falls below the
value set at the BRK-Nx input, the
BRK-OUT output is set to HIGH. In order
to ensure a fail-safe design this signal
must be inverted at the output (e.g. via
C0118).
t
t
BRK-OUT
BRK-RSP
|BRK-Nx|
C0195
t
9.2.14.2 Opening the brake (release)
Purpose A LOW signal at the BRK-SET input
immediately sets the BRK-CINH output
to LOW. At the same time the
BRK-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 is
elapsed.
t
BRK-SET
BRK-RSP
t
BRK-M-STORE
t
BRK-QSP
Function The BRK-OUT output signal is set to
LOW as soon as the torque reaches the
value set under C0244 (holding torque).
When the input is reset, a time element
is triggered. After the time set under
C0196 has elapsed the BRK-QSP output
is reset. This signal serves to e.g.
release the setpoint integrator after the
brake release time has elapsed.
t
MCTRL-NSET2
BRK-OUT
MCTRL-MACT
MACT = C0244
C0196
t
t
t
Note If an actual value higher than the value at BRK-Nx is detected before the brake release time (C0196) has elapsed, the
signals BRK-QSP and BRK-M-STORE are reset immediately. The drive c an immediately operate speed or phase-controlled.
If the BRK-QSP output acts on the QSP control word the drive is synchronised to the actual speed and follows its setpoint.