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International News: Motorized Potentiometers Simplify Automation Upgrades #1286
Posted by: micronorinc
City: Newbury Park
State: CA
Postal code: 91320
Country: USA
Contact Person: Dennis Horwitz
Telephone: 805-499-0114
Company: Micronor Inc.
Website URL:

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News Article:
Micronor's new MR266 series Remote Control Rheostats and MR267 series Remote Control Potentiometers are direct automation replacements for manual potentiometer controls. The built-in controller offers choice of 4-20mA or 0-10V control input/output control to ensure compatibility with the broadest range of PLC, DCS, A/D, D/A and other process control interfaces. MR267 series replaces low power (< 5 Watts) potentiometers in range of 100Ω /100KΩ plus choice of front panel or DIN rail mounting st yles. MR266 series replaces high power rheostats in range of 2Ω/ 50KΩ and four power ratings - 20W, 60W 170W and 300W.

In addition to analog input control, the MR266/MR267 series offer additional features. Three user-adjustable trimpots are used to define the MIN (4mA/0V input), MAX (20mA/10V input) and SPEED (10-120 seconds) set points. An OVERRIDE mode option allows the system engineer to determine how the unit should respond when a user tries to manual override via the front panel knob. Setting the OVERRIDE DIP switch to ON disables analog input control until a Reset is performed. The optional MR267A OVERRIDE Pushbutton/LED indicator assembly is offered as a turn-key accessory for use with the OVERRIDE mode.

EXAMPLE. A systems engineer wants to automate the speed control of motor drive system which is manually controlled via a 2W potentiometer adjusted within the range of 10-85Ω. The engineer has a PLC interface available with 4-20mA programmable output. The user would specify an MR267 configuration with a non-isolated 4-20mA input and 100Ω potentiometer. Upon receipt of the unit, he would then set MIN (4mA input) corresponding to 10Ω potentiometer setting and MAX (20mA input) corresponding to the 85Ω position. NOTE: The factory default settings are: MIN=0Ω, MAX=100Ω and SPEED=10s.

The MR266 Remote Control Rheostat also offers a convenient way of relocating high wattage (i.e. hot!) rheostats closer to the controlling equipment - for shorter electrical connections and better thermal control. Simply mount the MR266 unit in the environmentally-conditioned instrument cabinet and then remotely control it from the operator's console via the optional HPFF front panel-mount control accessory.

The MR266/MR267 series remote control rheostats/potentiometers operate from 24V DC with an operating temperature range of -15C/+65C and storage temperature range of -20C/+75C. High wattage rheostats may require temperature derating if operated near their power limits. In small quantities, a typical MR267 motorized potentiometer with non-isolated 4-20mA input is $995 with 2-3 week lead time. The typical MR266 series motorized rheostat configuration ranges from $1295 (20W) to $1495 (60W) to $1695 (170W) to $2495 (300W) - with 4-6 week lead time.

About Micronor

Micronor is a leading supplier of discrete control and feedback products for industrial automation and process control industries as well as mil/aero and other harsh environment applications. Motion control products include integrated position transducers, rotary encoders, resolvers, cam timers, programmable limit switches, motorized potentiometers, pulse generators and ergonomic pendant stations. Micronor was founded in 1968 and has regional headquarters in both the United States and Europe.

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