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The 8200-226 is the latest released model of the SPC (Servo Position Controller). It replaces models 8200-224 and 8200-225. The SPC positions a hydraulic or pneumatic actuator based on a position demand signal received from a control. The SPC positions a single-coil actuator using single or dual position feedback devices. The position demand signal can be sent to the SPC via DeviceNet, 4–20 mA, or both. A software program running on a Personal Computer (PC) allows the user to easily configure and calibrate the SPC.

The SPC Service Tool is used to configure, calibrate, adjust, monitor, and troubleshoot an SPC. The service tool runs on a PC and communicates with the SPC through a serial connection. The serial port connector is a 9-pin sub-D socket and uses a straight-through cable to connect to the PC. Woodward offers a USB to 9-pin Serial Adapter kit if needed for new computers that do not have a 9-pin serial connector (P/N 8928-463).

This kit contains a USB adapter, software, and a 1.8 m (6 ft) serial cable. (See Chapter 4 for SPC Service Tool installation instructions.) The SPC is configured by using the SPC Service Tool’s configuration file editor to create a file that is then loaded into the SPC. The SPC Service Tool can also read an existing configuration from an SPC into the configuration file editor.

The first time an SPC is connected to an actuator, it must be calibrated to the actuator’s position feedback transducer. The user is guided through the calibration process by the service tool. Calibration can also be performed by the control via the DeviceNet link. The calibration procedure can be found in the GAP™ help file.

The SPC requires a voltage source of 18 to 32 Vdc, with a current capacity of 1.1 A max. If a battery is used for operating power, a battery charger is necessary to maintain a stable supply voltage. The power line should be protected with a 5 A, 125 V fuse capable of withstanding a 20 A, 100 ms in-rush when power is applied.

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