IAI America ERC3 - Manual (Page 177)

Chapter 4 Operation
4.2 Operation in Positioner Mode 4.2.2 Operation in Positioner Mode 1
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[4] Brake release BK ················································ [Refer to 3.1.3 Circuit Diagram]
This is a signal to compulsorily release the brake of the actuator equipped with a brake.
The brake in the actuator is a non-excitation operation type electromagnetic brake. In a normal
operation, it automatically releases the brake with the servo ON and gets to the brake operating
status with the servo OFF.
Releasing the brake may be required to move the slider and/or the rod by hand in case of
installation of the actuator in the machine or direct teach *1 . In such cases, turn this signal ON.
The brake can be released while signal is turned ON.
*1 Direct teaching : This operation is intended to get coordinate values to the position by
moving the slider and/or the rod by hand.
Warning: (1) Take sufficient care to release the brake. Inappropriate brake release
may cause people to be injured and/or the actuator, the work and/or the
machine to be damaged.
(2) After the brake is released, always make the brake applied again. Any
operation with the brake remaining released is extremely dangerous. The
slider or rod may drop to cause people to be injured and/or the actuator,
the work and/or the machine to be damaged.
(3) Make certain that this signal is turned OFF (brake is activated) when the
power is supplied to the controller. Leaving the power ON may cause a
drop of the slider or rod, results in an injury or damage of the actuator
unit, work piece or devices.
[5] Time Constant for Control Signal Input
For the input signal for control of this controller, it is set to 6ms of input time constant to prevent
an error operation due to chattering or noise from the next page and later.
Therefore, input each input signal for 6ms or more (Note) continuously. The signal cannot be
identified if it is less than 6ms.
Input Signal
Input Signal
Identify
Not Identify
6ms