Lenze i700 - Opening the Brake with a Starting Torque; Display of the Holding Brake Status; Overriding the Selected Brake Mode; Basic Signal Flow

Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06 169
6 Holding brake control
6.2 Opening the brake with a starting torque
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6.1.3 No brake connected
In this operating mode, no control, detection and monitoring of the brake takes place during normal
operation.
6.2 Opening the brake with a starting torque
If the control is performed via the device state machine (selection 0x2820:1 =0 or 0x3020:1 = 0),
the required torque of the drive is precontrolled while releasing the brake.
0x2820:9
or 0x3020:9 for axis B is used to first make the basic selection whether a parameterised
starting torque or the torque memorised at the last closing process should be used for the
feedforward control.
The torque feedforward control can be activated by setting a feedforward control torque:
• 0x2820:9
= 0
• 0x2820:9
= 1 and 0x2820:10 ≠ 0
6.3 Display of the holding brake status
The CiA402 status word (0x6041 or 0x6841 for axis B) displays the holding brake status via bit 14:
• Bit 14 in the CiA402 status word = "0" means "Holding brake applied"
• Bit 14 in the CiA402 status word = "1" means "Holding brake released"
6.4 Overriding the selected brake mode
The 0x2820:11 and 0x3020:11 objects are used for a forced release or forced application of the
brake irrespective of its operating mode and the operating status of the servo inverter.
This function, for instance, is advantageous in the event of an error because the forced release of
the brake allows the axis to move manually.
6.5 Basic signal flow
The following signal flow clarifies the interaction between the L_SMC_BrakeControl function block
(in the application program of the Lenze Controller) and the device function integrated in the Servo
Inverter i700 for holding brake control.
Object Name Required setting
Axis A Axis B
0x2820:1 0x3020:1 Brake: Operating mode 2: No brake connected
 Note!
The torque is precontrolled for one second. During this time, the actual torque must have
reached 90 % of the setpoint torque, otherwise an error is triggered!