Electro Mechanical Brake - JVL MIS17 Series User Manual

5.11
5.11.1 Brake Introduction
The motor can be equipped with a electro mechanical brake to hold the position in Pas-
sive mode and power off situations where the motor has no torque. This is often desired
to keep mechanics in position for example if it's a vertical movement.
The brake control always takes care that the brake is activated (hold the motor) if a sit-
uation occurs where the motor is not powered and therefore can slip away from the de-
sired position.
This will typically be in situations like when the motor is in Passive mode or an error has
occurred which will cause the motor to be power less and not able to keep its position
in a controlled manner.
No involvement from users side is needed to activate and de-activate the brake.
It is also possible to connect an external brake via one of the user outputs I/O1 to 8.
5.11.2 Brake timing
The brake is always active in Passive mode because the motor has zero torque. When
changing to an active mode, the standby current is applied and the brake is disabled. The
brake needs some milliseconds to release and therefore there will be a short delay (typ-
ically ~40 ms) before the motor can move. The brake is always off in active modes.
When changing to Passive mode the motor goes into Stop mode to decelerate according
to the "Deceleration"-ramp. When "Actual velocity" is 0, the brake is activated and also
here a short delay makes sure that the brake is active before the motor goes passive.
5.11.3 Connecting an external brake
An external brake can also be connected to one of the eight user outputs I/O1 to 8.
The external brake will be operated in parallel with the internal brake without any time
delay.
MacTalk do not support setup of the external brake but an internal register is available
for setting up the brake. Please refer to
136 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS17x, 23x, 34x, 43x

Electro Mechanical brake

Access without MacTalk, page 138