Lenze 8400 TopLine - Manual (Page 656)

9 Basic drive functions (MCK)
9.12 Holding brake control
656
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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9.12.1 Internal interfaces
In the function block editor, the LS_MotionControlKernel system block provides the following
internal interfaces for the basic function "holding brake control":
Inputs
Identifier
Data type
Information/possible settings
bMBrakeRelease
BOOL
Releasing/applying the brake in connection with the selected operating mode
FALSE Apply brake.
• During automatic operation, the internal brake logic controls the
brake.
TRUE Release brake manually (forced release).
• Note!
The brake can also be released if the controller is inhibited!
• During automatic operation, the internal brake logic is
deactivated and the brake is released (supervisor operation). If a
controller inhibit has been set by the brake control, it will be
deactivated.
• In semi-automatic operation, the brake is released including
feedforward control.
bMBrakeStartValue2
BOOL
Selection of the torque feedforward control value
 Feedforward control of the motor before release
FALSE Starting value 1 is active (see the following figure).
TRUE Starting value 2 is active (see the following figure).
Creation of the feedforward control value for the release process of the brake:

Signal path for motor control with feedback
 Signal path for motor control without feedback
 Feedforward control value
 C02581/1 : Switching threshold
 C02581/2 : Hysteresis for release
 C02581/3 : Hysteresis for application
 C02581/4 : Starting value 1 for manual feedforward control
 C02581/5 : Starting value 2 for manual feedforward control
 C02582/Bit 4 : Selection of the feedforward control value (automatic/manual
selection)
nMBrakeAddValue_a
INT
Additive feedforward control value (speed or torque) in [%] for torque feedforward
control when the respective control mode is started
• For speed control: 100 % ≡ reference speed ( C00011 )
• For torque control: 100 % ≡ maximum torque ( C00057 )
 Feedforward control of the motor before release
0
t
Œ
Œ 
nSpeedSetValue_a
Œ Ž
Release brake
Close brake
bBrakeStartValue2
TorqueValue2
(+)nSetSpeed
(-)nSetSpeed
C02581/4
C02581/5
0
2
TorqueValue1
C02582 - Bit 4
nBrkAddValue_a
nMotorTorqueAct_a
T = 4 ms
S&H (Retain)

‘

1
0
0
1
1