Remote control potentiometers simplify automation upgrades

Micronor’s new MR266 series remote control rheostats and MR267 series remote control potentiometers are turn-key solutions for upgrading manual potentiometer-based process controls to automated PLC control.

May 3rd, 2010

Newbury Park, Calif., May 3, 2010—Micronor’s new MR266 series remote control rheostats and MR267 series remote control potentiometers are turn-key solutions for upgrading manual potentiometer-based process controls to automated PLC control. The products operate at 24 Vdc and offer choice of 4-20mA or 0-10V input/output interface for compatibility with the broadest range of PLC, DCS, A/D, D/A and other control devices. Mounting options include front panel mount (MR267 only) and DIN rail mount. MR266 series replace low power (less than 5 watts) potentiometers in range of 100 to 100K Ohms. MR266 series replace high power rheostats in range of 2.0 to 50K Ohms with four power options (20/60/170/300 watts).

In addition to analog input/output control, the MR266/MR267 series offer additional features. Three user-adjustable trimpots determine 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 define how the unit will respond when a user tries to manually override the unit 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.

The MR266 Remote Control Rheostat also offers a convenient way of relocating high power (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.

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