West CD‑02 817‑31000‑002 Valve Motor Drive Controller Product Description

Overview

West CD‑02 817‑31000‑002 is a single‑loop valve motor drive (VMD) controller from West 8170+ series, designed for three‑point floating control of electric actuators. This West controller outputs open/close relay signals to drive valve motors, receiving process signal from temperature, pressure or flow sensors and executing PID closed‑loop regulation. CD‑02 is the internal configuration code, and 817‑31000‑002 is the full order part number; it is widely used for furnace, extruder, heat exchanger and HVAC valve loop overhaul and spare‑part replacement of legacy West VMD control systems.

Features

West CD‑02 817‑31000‑002 supports universal sensor input including thermocouple, Pt100, 4‑20mA and 0‑10V process signals. This West VMD controller uses three‑step floating PID algorithm without continuous analog output, directly driving the actuator open/close contactor. CD‑02 817‑31000‑002 integrates auto‑tune and pre‑tune function to optimize PID parameters, reducing valve hunting and mechanical wear. The West controller provides dual process alarms, auxiliary status output and optional Modbus‑RTU communication for SCADA connection. It adopts 1/8 DIN panel mounting with dual 4‑digit LED display for PV and SP viewing.

Specs

West CD‑02 817‑31000‑002 valve motor drive controller

• Brand: West Control Solutions

• Series: 8170+

• Model code: CD‑02

• Part number: 817‑31000‑002

• Control type: 3-point floating VMD valve motor drive

• Input: Universal input (TC / Pt100 / mA / mV)

• Control output: Relay open / close outputs

• Tuning: Auto-tune / Pre-tune PID

• Communication: Optional Modbus RTU

• Supply: 100–240 VAC

• Mounting: 1/8 DIN panel mount

• Display: Dual 4-digit LED

Principle

West CD‑02 817‑31000‑002 continuously reads the process value from field sensors and compares it with the setpoint. If PV is lower than SP, the controller activates the valve open relay; if PV exceeds SP, it activates the valve close relay. The built‑in PID calculates operating time and dead band to avoid frequent valve reversal. The controller does not require valve LVDT feedback; position is controlled by the duration of motor drive pulse. Alarm and communication signals transmit loop status and fault information to upper monitoring system.

Applications

West CD‑02 817‑31000‑002 is deployed in industrial furnaces, plastic extrusion lines, thermal oil systems, boiler auxiliary loops and HVAC air handling units. This West VMD controller is used for temperature control by adjusting hot/cold air valves, steam valves and water regulating valves. 817‑31000‑002 fits heat treatment equipment maintenance, thermal control loop renovation and spare replacement of legacy West 8170+ floating valve controllers.

Installation & Maintenance Notes

Follow official West 8170+ hardware service manuals during installation of West CD‑02 817‑31000‑002 controller. Confirm actuator wiring interlock: open and close outputs must be electrically interlocked to prevent short circuit. Set dead band and motor travel time after replacement to prevent valve oscillation. Back up PID and alarm parameters before replacement. Check sensor cable shielding and terminal tightness regularly in high‑temperature workshop environments. Confirm exact full part number 817‑31000‑002 and CD‑02 configuration code before spare‑part swap‑out to verify input type, output definition and voltage class compatibility.