• Provides Relay Contact Closures Comparing a DC Input to a Potentiometer Position Input
• Relay Safety Interlock
• Potentiometer Values from 120 ohms to 100 kilohms
• Adjustable Deadband (Differential)
• Choice of Input Ranges
• 10 Year Warranty

The MM3200 controller compares a DC input signal to a DC signal from the slide position of a potentiometer in a valve or linear actuator. The module has two spst relays to provide bi-directional (open-close) ON/OFF switches. When the input signals are unequal, the MM3200 provides a contact closure to turn on a motor which drives the valve open or closed. When the signals become equal, the contact opens and the motor stops. The deadband control adjusts the sensitivity of the module and determines the amount of error required before the relay closes. Adjustment of 0.25% to 50% of span is available.

Two relays are used for the open and close switches. Each relay has dpdt contacts. One set is used for motor control. The other set is used to control the supply voltage to the other relay coil. This relay safety interlock feature makes it impossible to have both relays closed (both motors on) at the same time.

The module can also be used with a manual potentiometer and the contact closures to drive a process until the DC input signal matches the potentiometer setting.

All Wilkerson products are designed with RFI filters and lightning protection to reduce susceptibility to electrical noise and damage by lightning. It utilizes a stable -1.23 V power supply to excite the potentiometer.

TYPICAL APPLICATIONS
Valve or actuator position control, pH acid/ base pump control, etc.

INPUT RANGE Voltage select any range from 0 to 1 VDC to 0 to 10 VDC max Current 4/20 mA (others available) INPUT IMPEDANCE Voltage 100 kilohms Current 62 ohms POTENTIOMETER FEEDBACK 70% or greater rotation required to match full scale input POTENTIOMETER RESISTANCE select any value from 120 ohms to 100 kilohms DEADBAND 0.25% to 50% of span EXCITATION -1.23 V, 10 mA max load RELAY CONTACT (2 each spst) Resistive Load 5 A max, 150 W max, 220 VAC max,30 VDC max Inductive Load (Power factor >0.4) 2.5 A max, 75 W max, 220 VAC max, 30 VDC max

RESPONSE TIME 120 ms typical ACCURACY ±0.1% of span COMMON MODE REJECTION 120 dB, DC to 60 Hz OPERATING TEMPERATURE 14°F to 140°F/-10°C to 60°C TEMPERATURE STABILITY ±0.02% of span/°C max POWER 115 VAC ±10%, 50 or 60 Hz (2.5 W max) 230 VAC ±10%, 50 or 60 Hz (2.5 W max)

PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 PIN 10 PIN 11

Power AC L1 or DC + Potentiometer Input FS Power AC L2 or DC - Control Input + Control Input - Feedback (Pot) Common Feedback (Pot) Wiper Feedback (Pot) Excitation Relay Common Close Relay NO Open Relay NO