GE Fanuc IC800SLCBVL050 Power/Brake Cable

S-Series Servo Motor Encoder Wiring

Position feedback cables as shown in Table 3-15 are available from GE Fanuc for the S2K

Series controllers. Plug the motor end of the encoder cable into the connector on the motor

and the DB-type connector end of the cable into the DB-15 socket labeled Position

Feedback on the front of the controller. The best system reliability is achieved when the

encoder cable is returned in a separate conduit from that housing the motor power cable.

The feedback cable should use 24-28 AWG twisted pair wire and must be shielded. The

shields must be terminated to the isolated ground pins on the Position Feedback (DB-15)

connector on the S2K controller as shown in Table 3-8. Maximum serial encoder cable

length is 15 meters using factory-supplied cables. If two parallel 24 AWG wires are

connected to both the +5v and ground (GND), as shown in Table 3-8, longer cable runs

require the wire gauge to be increased to reduce the signal voltage drop. The S-Series

motors require a 5V ±5% (4.75 to 5.25 VDC) power source for proper operation.

Enable Input

The Enable discrete input allows the host controller to enable or disable the power output

stage of the controller and reset faults. The Enable input must be active to run the servo

motor. This Enable hardware input works in tandem with a logical (software) enable register

called the Power Output Stage Enable (POE) register. The POE register will allow current to

flow into the motor only when set true and no faults are present on the controller. Since a

Lost Enable (LE) fault is generated when this hardware enable input is false, ensure that

POE=1. the hardware enable input is true, and all faults have been cleared (RSF register) to

activate the power stage of the controller.

The current state of the Enable input can be queried using the Fault Code (FC) register in

the terminal window. The Enable input should be connected as shown in the connection

diagrams in Section 3.6.10. The internal schematic for the enable input circuit is shown below.

Analog Output (AO)

The hardware analog output is primarily used as a process input to the controller programs,

but it can also be used a diagnostic output for various signals used in the tuning and

debugging process. The Analog Common pin is used for the signal return. The Analog

Output (AO) software parameter allows you to configure this output to represent one of the

following signals:

• Actual velocity (AO = VLA)

• Actual output current (AO = CMD)

• Following error (AO = FE)

The output can also be forced to a specific voltage value by setting the AO parameter to the

desired voltage from a program, PC terminal emulator, or Motion Developer terminal

window. The analog Output value can be queried in the terminal window using the “?” command.

Use 20-28 AWG twisted-pair wire with an overall shield for this signal interface. For best

noise immunity connect the shield to the Analog Common pin on the Auxiliary I/O connector.

The internal schematic for the analog output circuit is shown below.

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