Woodward 8200-226 Servo Position Controller

Overview

The Woodward 8200-226 SPC is the latest Servo Position Controller, replacing models 8200-224 and 8200-225. It precisely positions a hydraulic or pneumatic actuator based on a position demand signal received via DeviceNet or 4–20 mA input. The SPC Service Tool allows easy configuration and calibration via PC.

Key Features

High-precision actuator control with 0.25% system accuracy
Supports DeviceNet and 4–20 mA input signals
Single or dual position feedback compatibility
Advanced diagnostics and fault detection
Wide operating temperature range (-40 to +70 °C)

Technical Specifications

System Accuracy

Input Type	Accuracy	Temperature Coefficient (TC)
DeviceNet	0.25% of full scale @ 25°C	< 150 ppm/°C
4–20 mA Input	0.25% of full scale @ 25°C	< 300 ppm/°C

Electrical Specifications

Specification	Details
Power Input	24 Vdc nominal (18–32 Vdc range), 1.1 A max
Power Dissipation	20 W (typical heat load)
Actuator Driver Output	±10, ±25, ±50, ±100, ±250 mA
Output Filter	6 ms lag
Resolution	11 bits
Linearity	0.2% of full scale

Analog Demand & DC Transducer Inputs

Parameter	Value
Nominal Range	4–20 mA
Operating Range	2–22 mA
Fault Detection Current	< 1 mA or > 23 mA
Common Mode Input Voltage	200 Vdc
Input Filter	5 ms lag
Resolution	13 bits
Linearity	0.1% of full scale

Monitor Output

Parameter	Value
Nominal Range	4–20 mA
Operating Range	0–25 mA
Isolation Voltage	500 Vrms
Maximum Load	500 Ω
Output Filter	3 ms lag
Resolution	12 bits
Linearity	0.2% of full scale

LVDT/RVDT/DC Voltage Input

Parameter	Value
Max AC Voltage	10 Vrms
DC Voltage Range	0–12 Vdc
Input Impedance	100 kΩ min
Input Filter	10 ms lag
Resolution	14 bits
Linearity	0.1% of full scale

Transducer Power Output

Parameter	Value
Nominal Voltage	18 Vdc ±10%
Maximum Load	120 mA

Relay Driver Outputs

Parameter	Value
Maximum Voltage	32 Vdc
Maximum Current	500 mA
Voltage Drop	1V @ 500 mA
Isolation Voltage	500 Vrms

DeviceNet Communication

Parameter	Value
Node Isolation	500 Vrms
Node Power	Self-powered

Service Port

Parameter	Value
Protocol	RS-232
Connector	9-pin Sub-D socket
Isolation	500 Vrms

Diagnostics

Fault Type	Description
Driver Current Error	Demanded current mismatch by ±20%
Driver Overcurrent	Measured current exceeds demand by 25%
Actuator Open Threshold	Varies with current demand (e.g., 108 Ω for 120 mA)
Actuator Shorted Threshold	1 / full-scale current in Amps
Exciter Voltage Tolerance	±0.2 Vrms
System Diagnostics	Memory test, voltage monitoring, CPU power check, watchdog timer
DeviceNet Faults	Communication lost/slowed below 200 ms