Lenze 8400 User Manual

8 Basic drive functions (MCK)
8.12 Holding brake control
618
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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8.12.4 Process when brake is closed
1. The motor is decelerated when the setpoint is reduced by the user (e.g. turn down the
potentiometer, setpoint selection via CAN).
• The motor can also be decelerated by the "Quick stop" function or by "DC-injection braking",
either directly requested by the user or as response to an error.
2. If the speed setpoint and the actual speed have fallen below the lower speed threshold or only
the speed setpoint has fallen below the lower speed threshold and the actual value monitoring
time has expired:
•The bMBrakeReleaseOut trigger signal for the holding brake switching element is set to FALSE
for closing the brake.
•The bMBrakeReleased status signal is reset to FALSE.
• In the operating modes with setpoint request via control signal (operating modes "Homing
",
"Manual jog
" and "Positioning"), the brake closes depending on the internal state bBusy
(setpoint generation through active profile generator) of the Motion Control Kernel.
• The brake application time starts to expire.
3. After the brake application time has expired, the controller is inhibited.
4. After the waiting time set in C02589/3
has additionally expired, the status monitoring starts
again (if activated via bit 5 in C02582
).
5. In order to prevent the drive from further rotating/accelerating in the event of an error of the
feedback contact, controller inhibit is cancelled again and the drive is held at standstill in a
speed-controlled manner.
Time diagrams
[8-42] Close holding brake in automatic mode via speed threshold (actual value = setpoint)
 Feedforward control
 C02581/1: Switching threshold
 C02581/2
: Hysteresis for release
 C02581/3
: Hysteresis for application
 C02593/2
: Application delay
 C02589/1
: Application time

bMBrakeReleaseOut
0
0
bMBrakeReleased
CINH
t
t
t
t

0
nSpeedSetValue_a_
nSpeedSetValue_a



Lenze 8400 Specifications

General

Category	DC Drives
Series	8400
Protection class	IP20
Control Type	Vector control
Communication	CANopen, PROFIBUS, Ethernet
Protection Features	Overcurrent, overvoltage, undervoltage, overtemperature
Input Voltage	AC 230/400/480 V