Technical information

Installation

In either pulse mode, once motion is initiated with these inputs, motion in the opposite

direction cannot be achieved until motion in the initiated direction has been stopped by

stopping the incoming pulses.

In a pulse train application, the pulses are fed into the CW and CCW inputs on the 15-pin D-

subminiature style command connector (pins 4 and 2, 5 and 3 respectively). The inputs are

optically isolated and can be used for current sinking or sourcing; this requires two

connections per input. In either case (sinking or sourcing), the noise immunity is improved

when the normal state of the input does not cause current to flow in the optical coupler.

Current should only flow when a motion pulse is applied by the external pulse generator. Each

voltage pulse must be at least 1.5 microseconds wide and between 2.4 and 5.5 VDC (TTL

compatible) to be accepted as a valid pulse. The signal driver you use must be able to supply

25mA (either sinking or sourcing). If open collector logic devices are used in a sinking

connection, external pull-up resistors may be necessary. Contact EMERSON Motion Control

Applications Engineering department if you have questions concerning open collector logic

devices.

The speed of the system is based on the pulse frequency pulses per second (PPS) and can be

changed by changing the value of Steps Per Revolution (SR) in the PCX Parameters screen

(See “Software Setup and Operation” on page 67.). The maximum pulse frequency is 210

KHz.

Any connections between the customer supplied interface (stepper controller, etc.) and the

command connector should be made through a shielded cable. The shield of this cable should

be connected to the customer interface ground (source end). If no shield connection is

available at the source end, then the shield connection on the command connector (15-pin)

may be used.

Keep in mind that this shield connection is connected internally to chassis ground of the drive.

For more detailed information refer to the electrical wiring information on grounding on

page 26.

Figure 26: Command Connector Circuit Pulse Command Signals

OPTICAL INPUT

DEVICES

INPUTS

COMMAND

CONNECTOR

CCW

200