2
Overview
Festo – EXCM-30/-40-...-PF-EN – 1603 – English
13
2.6.3
Brake
If the motors are equipped with a brake, they are controlled as follows:
Automatic activation of the brake
The motor controller automatically controls the brake through release of the drive:
–
The brake is opened when the drive is enabled.
–
The brake is closed when the drive is blocked (either through a pilot signal or an error with error
response “Output stage off ”).
Through the mechanical inertia of the brake, opening and closing take a certain length of time. The
behaviour of the controller when the drive is enabled is adjusted to the mechanical inertia of the brake
through the switch-on and switch-off delay.
Switch-on delay
When enable is being set (ENABLE), the switch-on delay time (150 ms) starts to run and the position
controller of the controller takes over control of the connected planar surface gantry. The brake opens
simultaneously. The controller accepts positioning jobs only after the switch-on delay has expired.
Switch-off delay
When the enable signal is removed, the time set for the switch-off delay starts to run (150 ms). The
brake closes during this time. The position controller holds the drive in position. The position control
ler and the output stage are only switched off after expiration of the switch-off delay.
Note
When the output stage is switched off, such as through blocking of the drive, or when
the power supply is interrupted during movement, there is no deceleration of the drive
via a braking ramp. The holding brake is closed immediately. This results in increased
wear and can lead to damage to the motors if it occurs repeatedly.
–
Avoid immediate blocking of the drive during movement
–
Before blocking the drive, make sure that the drive is stopped, such as by resetting
STOP (control byte CCON bit 1) or by triggering an external stop (input ESTOP at [X4])