Inputs and Outputs
Note that while the I/O functions outlined here apply to all Applied Motion drives, the specific I/O point assigned to each function will vary depending on the specific drive used. Consult your drive's hardware manual for wiring and configuration information pertaining to your specific drive.
Fault Output
The drive features a Fault Output that will be triggered if there is a fault condition. This fault may be a fault within the drive or it may indicate a system fault. Not all these faults will cause the drive to be disabled. If you are running the Configurator while an alarm condition develops, a dialog box will pop up and give you details of the fault. Alarms and faults are also displayed by a pattern of red and green flashes of the drive’s front panel LED.
The Alarm Reset input can used to clear alarms and faults if you
check the box marked "Allow alarm reset input to clear it".
For use when your motor is fitted with a fail safe holding
brake. These are normally used to hold the load in position when the motor is
turned off, especially useful when the motor must hold a load against gravity.
Most brakes are fail safe, this means it requires a voltage to
hold the brake in the "released" position, allowing the motor to move.
The output gives you a choice between closing or opening the
brake output to release the brake. Please select this option with care as the
wrong choice could damage your system.
The Brake Output has two time delay settings.
The "release delay" is the time delay between the brake being
released and the drive being available for moves . If a move is attempted
immediately after the drive is enabled this could create a time lag in your
system as the motor will not respond until after the brake release period.
The "brake engage" delay controls the time period between the
brake engaging and the drive disabling. This will ensure that the brake is
fully engaged before the load is no longer being held in position by the
motor.
Applied Motion drives have two inputs that can be configured as
end of travel limit switches. These are useful for linear applications such as
actuators. Consult your drive's hardware manual for specific information on the
limit switch inputs for your specific drive.
This dialog box is where you tell the drive whether your input
switches or sensors are Open or Closed when they are activated. You can also
select the "Not Used” option for when limit sensors are not present. SCL
users can configure these limits to be used as programmable inputs.
What happens when a limit switch is activated will depend on the programming mode you are using and the particular command you are using at the time. Please refer to your programming manual for details of Limit Switch Input errors.
The Motion Output can be used to tell another piece of electronics what the drive is doing. If you want to signal to indicate when the motor is in motion you have two choices: the output can be closed when the motor is moving and open when it is stopped, or it can be open when moving and closed when stopped. If you want a tachometer output (a signal proportional to the motor speed), this output can emit pulses as the motor turns. The default setting provides 100 square wave pulses per revolution (assuming you have a 1.8° motor, otherwise you get 2 times the motor electrical frequency).
Additional
settings of 200, 400, 800 and 1600 pulses/rev are available for drives with DSP
firmware version 1.02 or later. However, the tach output’s maximum frequency
is fixed, so the integrity of the tach output signal at higher resolutions is
dependent on motor speed.
| tach ppr | accurate at speeds |
| 100 | 0 - 50 rev/sec |
| 200 | 0 - 25 |
| 400 | 0 - 12.5 |
| 800 | 0 - 6.25 |
| 1600 | 0 - 3.125 |
Note: Signal integrity is best with an 80 mA load (use 300 ohms at 24V, 150 ohms at 12V or 62 ohms at 5V.)
Motor Enable Input
The Motor Enable Input allows you to turn the power stage of the
drive on and off. This means that the drive can be on, with power going to it,
but the motor will not be active.