7
Operational Overview
Functional Overview
The drive is a digital servo drive which provides three basic modes of operation: Pulse,
Velocity and Torque. The Operating Mode selection defines the basic operation of the drive.
External control capability is provided through the use of input and output functions. These
functions may be assigned to any input or output line which may be controlled by external
devices, such as a PLC or multi-axis controller, to affect the drive operation.
Drive parameters can be modified using PowerTools FM software or an FM-P. All drive
parameters have a pre-assigned Modbus address which allows you to access them using a
Modbus interface.
Pulse Mode
In Pulse mode, the drive will receive pulses which are used to control the position and velocity
of the motor.
There are three pulse interpretations associated with Pulse mode: Pulse/Pulse, Pulse/
Direction and Pulse/Quadrature. These selections determine how the input pulses are
interpreted by the drive.
Note
High Performance Gains check box in PowerTools FM software is typically enabled when
Pulse mode is used (the default is enabled).
Pulse Source Selection
The drive provides two types of pulse input circuits which allows you to choose the
appropriate input type to match the device generating the position pulses. The selection is
done by wiring to the desired input pins of the Command Connector and setting the Pulse
Source selection in the Setup tab. The Differential setting (default) is perfect for most
encoders or upstream drives. The Single Ended setting is a good match for any open collector
driver that requires an external pull up resistor making it ideal for most stepper controllers,
PLC stepper cards and PC computer parallel printer ports.
The two hardware input circuits are included in the drive and are accessible through the drive
command connector. The differential input circuit is RS-422 compatible making it inherently
noise immune while being able to accept pulse rates of up to 2 Mhz per channel. The single
ended inputs use high noise immunity circuitry and have internal pull-up resistors to the
drive’s 5 Volt logic supply so external pull-ups and biasing circuitry is not required. When
proper installation techniques are followed as shown below, the differential input setup will
provide a more robust and noise immune system than a single ended input setup.
Differential input is recommended under any of the following conditions:
• Pulse width < 2 µs
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Содержание Control Techniques EN Series
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