Lenze 931E/K Small Drives Control - Manual (Page 110)

Digital outputs and analog inputs and outputs
Holding brake DOUT3
7
l
110 SW−HB 13.0002−EN 4.1
7.2 Holding brake DOUT3
If your motor is equipped with a holding brake, the holding brake can be controlled by the
931E/K servo positioning controller in line with the operation. The 931E/K servo
positioning controller can only control holding brakes with a rated voltage of 24 V DC. In
the 931E/K, the holding brake is supplied by the 24 V logic supply, i.e. independently of the
DC bus voltage in the power stage.
The holding brake is connected via the digital output DOUT3 at connector X3. For a detailed
description of the holding brake connection and the maximum permissible operating
currents of the brake, please see the GHB931E or GHB931K Manual.
Brake functions
The holding brake is always enabled when controller enable is switched on and the power
stage of the
servo positioning controller is activated. Due to the mechanical inertia and the
electrical time constant of the control coil, holding brakes are subject to switching delays.
The servo positioning controller considers this during operation. Corresponding delay
times can be selected (see Fig. 27 on the next page).
Select the menu Parameters
W Device parameters W Brake functions to edit the
parameters for the holding brake control. The below window appears:
931e_326
The Run delay t
F
is used to adapt the holding brake control to its mechanical inertia. With
speed control and position control, the speed setpoint will be set to zero during the delay
time when the controller is enabled. In this way, the motor is energised, but the drive
remains with holding torque at standstill until the brake is completely released.
When the controller is inhibited, the speed setpoint will be set to zero. As soon as the actual
speed is around zero, the 931E/K deactivates the control output for the holding brake.
From this time on, the Stop delay t
A
becomes effective. During this time, the drive remains
in the current position until the holding brake is actually applied. After the delay time,
controller enable will be switched off. In both cases, the mechanical wear of the holding
brake will be reduced.