Lenze DDS Function library 9300 Servo - Manual (Page 13)

Function block library Lenze9300Servo.lib
Special functions
2.1.1 Holding brake (L_BRK)
2−3
L
Lenze9300Servo.lib EN 1.1
2.1.1.2 Open the brake (release)
wRelease
Time
t
t
bSet_b
MCTRL_nNSet2_a
bOut_b
bCInh_b
MCTRL_MAct_a
MCTRL_MAct_a = nMSet
t
t
bMStore_b
t
bQSP_b
t
t
Abb. 2−3 Signal sequence when the brake is opened (released)
Functional sequence
1. Select the constant FIXED0% (selection number 1000) using bSet_b = FALSE, then bCInh_b
switches = FALSE immediately. At the same time, bMStore_b switches immediately = TRUE.
– You can use this signal to make the drive build up a defined torque against the brake. The
drive thus takes up the torque while the brake opens. The signal is reset only after the time
set by wReleaseTime has elapsed.
2. As soon as the torque set by nMSet has been reached (holding torque), then bOut_b = FALSE,
immediately.
3. When the input is reset, a time element is triggered. After the time defined by wReleaseTime
has elapsed, then bQSP_b = FALSE, immediately.
– With this signal you can, for instance, enable the setpoint integrator after the brake−opening
period.
Note!
If, before the end of the brake−opening period, ( wReleaseTime) an actual speed is detected, that is
greater than the value at bNx_a, then bQSP_b switches = FALSE and bMStore_b = FALSE,
immediately. The drive can immediately operate speed− or phase controlled. If bQSP_b has an
influence on the control word QSP, then the drive synchronises itself to the momentary speed and
follows its setpoint.