Function block library
7-48
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SHB9300CRV EN 2.0
7.6.12.1 Close brake
Purpose
A HIGH signal at the BRK-SETinput activates the function. TheBRK-QSP output changes to HIGH
at the same time. This signal can be used to decelerate the drive to zero speed via a deceleration
ramp.
Function
If the setpoint speed falls below the speed set at the BRK-Nx input, the BRK-OUT output is set to
HIGH.To obtain protectionagainst open circuit,this signal must be inverted at theoutput (e.g. under
C0118).
When the BRK-OUTis set, a time element is triggered. After the time set under C0195 has elapsed,
theBRK-RSPoutputisset.Usingthisoutput,forinstance,thecontrollerinhibit (insidethecontroller)
can be set. In general, the brake-close time is set here. This is necessary because the brake does
not closeimmediately aftertheactivationof theBRK-OUTsignaland thusthedrivedoesnot provide
a holding torque for the time set.
t
t
BRK-SET
MCTRL-NSET2
t
BRK-OUT
BRK-RSP
|BRK-Nx|
C0195
t
BRK-QSP
t
Fig. 7-40 Signal sequence when the brake is closed
7.6.12.2 Open brake
Purpose
TheLOWsignalat theBRK-SETinput sets the BRK-CINHimmediately toLOW. TheBRK-M-STORE
output is set to HIGH at the same time. This signal initiates the generation of adefined brake torque
against the brake. The drive thus takes up the torque while the brake opens. The signalis reset only
after the time set under C0196 has elapsed.
Function
The BRK-OUToutput signal is set to LOW as soon as the torque reaches the valueset 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. With this signal, the setpoint integrator can be enabled after the
brake-open time has elapsed, for instance.
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