micronor MR266 Motorized Potentiometer Installation Guide

micronor MR266 Motorized Potentiometer Installation Guide

The MR266 series is a direct automation replacement for existing manual rheostat controls. Interface options include 4-20mA or 0-10V which ensures compatibility with the majority of PLC or DCS control systems MR266 series replace a manually controlled, high power rheostat (10 watts up to 300 Watts). For low wattage potentiometer applications (< 5W), please refer to MR267 series data sheet. For higher wattage requirements (500-1000W), contact Micronor sales.

Features

• 35mm DIN Rail Mount
• User-Adjustable Timing Cycle from 10 to 120 Seconds
• User-Selectable Override options
• Optional MR267A Front Panel Override LED Indicator and Reset Pushbutton Accessory
• Optional HPFF Front Panel Mount Remote Potentiometer Control Accessory

Setting up the Motorized Rheostat

1. Make Power, Input, and Output Connections to Controller using the supplied PHOENIX plug.
   Note: if using MR267A Accessory, first mount to front panel and then connect to special mating receptacle on bottom side of Controller PCB (not visible in this photo).

2. Set DIP switches for desired Override and Bias modes. See following page for detailed explanation of settings and factory defaults.

3. Make connections to Rheostat. Crimp-style ring or blade terminals are recommended

   • For 20W/60W models, use size #4 or M3
   • For 170W/300W models, use size #8 or M4

4. Adjust Min and Max offset if 4mA/0V and/or 20mA/10V set points are to be different than default 0Ω and Full Scale settings, respectively. Adjust SPD trimpot for timing cycle other than the default setting of 10 seconds (Adjustable range is 10-120 seconds)

Input Response is User Adjustable

Factory Setting using R1=100 Ω as an example
User Setting with Min (4mA)=10 Ω and Max (20mA)=85 Ω

Start-Up Options

Controller Connections

depend- ing on configuration.
2| I- or V-| Input Signal Return (Negative). May be either current (I-) or voltage (V-) depending on configuration.
3| VIS| Isolated voltage available for customer use. Voltage is nominal 12V. Maximum load 30mA. Can be used to power an external 4-20mA loop power sensor. Available on isolated 4-20mA Input Option 2 only.
4| O+| Position output. May be either curent or voltage depending on option
5| O-| Position output return signal. May be either curent or voltage depend- ing on option.
6| VOP| Isolated voltage available for customer use. Voltage is nominal 12V. Maximum load 30mA. This isolated voltage is only available with iso- lated 0-10V Input/Output.
7| GND| System ground. Internally connected to pin 9.
8| V10| Precision Reference output 10V. Maximum load 6mA. May be used to power remote control potentiometer. Voltage is referenced to sys- tem ground. Optional HPF00-7-0-0 Remote Potentiometer accessory is available as a turnkey solution.
9| GND| System ground. Internally connected to pin 7.
10| 24+| System power. Connect to external power supply. Peak current drawwhen motor is running is 220mA. Typical idle current draw is <60mA.

MR267A LED/Pushbutton Accessory

The optional MR267A is a turnkey, plug-in assembly for users utilizing the Manual Override function (see Start-Up Options). If Override is set to ON, the LED will flash when the operator attempts to manually override the pot position. The LED continues to indicate that the unit is in Manual Override mode and will ignore the analog input. Externally toggling the power Off/On or pressing this pushbutton will restore the motor pot to normal analog input control.

If user needs to make direct connections to the MR267A receptacle, then use Molex 51021-0800 plug (DigiKey WM1726-ND) and appropriate crimp terminals.

MR267A Connections

Pin 1 = Common Common Connection to LED cathode and switch Common
Pin 3 = Reset Connection to switch NO contact and to inter- nal NMCLR input with 4.3kΩ pull-up to +5VDC
Pin 6 = LED Connection to LED anode to RBS processor input via internal 681Ω series resistor

Note: MR267A plugs into mating receptacle located on reverse side and bottom of controller PCB

Replacement Plugs
MR267B-10 for Current Models

MR267B-20 for Voltage Models

A specially labeled Phoenix 10C Mini Combicon plug (Phoenix 1803659) is supplied with each motor pot. Additional units can be purchased from Micronor. Be sure to order the correct version according to the type of interface (current or voltage) on your units.

I/O Option 22

Input = Isolated 4-20mA
Output = Isolated 4-20mA, Loop Powered

Isolated Input/Output Using
External 24V DC isolated Power Supply

Isolated Input/Output Using
External 24V DC isolated Power Supply

Input = Isolated 0-10V
Output = Isolated 0-10V

Connections for Remote Potentiometer
Used to Control Local MR267 Motorized Potentiometer

Reference Drawings

300 Watt Model

600 Watt Models

Specifications

Analog Input

Position Input Current Input Bias = ON

Input Bias = Off

| -4mA to 20mA0mA to 20mA| A signal dropout below 4mA will cause the motor pot to remain at its last position. Signals ≥20mA are interpreted as 20mA signal.
Signals ≤0mA or less are interpreted as 0 position. Signals ≥20mA are interpreted as 20mA signal.
Position Input Voltage Input Bias = ON
Input Bias = OFF| 2V to 10V
0V to 10V| Signals ≤2V are interpreted as 0 position. Signals ≥10V are interpreted as 10V signal.Signals ≤0V are interpreted as 0 position. Signals ≥10V are interpreted as 10V signal.
Input Isolation| 1kV| Only applies if isolated input option is ordered
Reference Output| 10.00V, max 6mA| Used to power external potentiometer. Voltage referenced to systemground.
Position Accuracy| 0.5% m|
Position Resolution| 0.25% typical|
TIME Setting Range| 10s to 120s| Default factory setting is 10 seconds.
MIN Setting Range| 0% to 25%| Corresponds to 4mA / 0V input. Default setting is 0%
Max Setting Range| 52% to 100%| Corresponds to 0mA / 10V input. Default setting is 100%
Potentiometer Output

Type| Wire Wound| See DPC data sheet for additional technical details
Resistance Tolerance| ±5%|
Linearity| 2% over electrical angular range| Rheostats have mechanical versus angular range. The difference is due to the wide wiper landing pad at the upper and lower ends. The default factory setting will place the Min and Max points in the center of thelanding pads. The user can readjust the Min and Max points as needed.
Power RatingDPM20 DPM60 DPM170 DPM300 DPM600| 20 W at 20°C60 W at 40°C170W at 40°C300W at 40°C300W at 40°C| Max temperatures must be derated if operating near power rating. Consult DPM data sheet for derating curve
Dielectric Strength| 2000V AC, 50 Hz, 1 min|
Analog Output
Position Output Current Power SupplyLoop Voltage Output Bias = ON Output Bias = OFF| Loop Powered 26V max4mA to 20mA0mA to 20mA| 500Ω external burden resistance, max with 24 V or higher
Position Output Voltage Load Current Output Bias = ONOutput Bias = OFF| 5mA max 2V to 10V0V to 10 V|
Output Isolation| 1kV| Only applies if isolated output option is ordered
Position Accuracy| 0.5% max|
Position Resolution| 0.25% typical|
Power
Supply Voltage| 20V to 26V DC|
Supply CurrentStandby Running Peak| < 35mA200mA typical 500mA max| When the motor has reached position, the current consumption is reduced to a standby current. During a typical move, the current draw is approximately 200mA. Start and stop peaks may reach the peakmaximum. Recommended power supply is 24VDC at 400mA
Environmental
TemperatureOperating Storage| -15°C to +65°C-25°C to +75°C|
Humidity| 0-95% non condensing|
Physical Attributes
Weight20W60W170W300W600W| 23 oz (630g)26 oz (730g)36 oz (1020g)43 oz (1220g)63 oz (1790g)|

Ordering Info MR266 Motorized Potentiometer

MR266

22
Input/Output Interface
22 4-20mA, Isolated
44 0-10V, Isolated

B
Power Rating of Rheostat
A DPM20 (20W)
B DPM60 (60W)
C DPM170 (170W)
D DPM300 (300W)
E DPM600 (600W – Dual DPM300 Pots)

8
Resistance of Rheostat

1. 2Ω
2. 3Ω
3. 5Ω
4. 10Ω
5. 20Ω
6. 25Ω
7. 50Ω
8. 100Ω
9. 200
10. 250Ω
11. 500Ω
12. 1kΩ
13. 2kΩ
14. 2.5kΩ
15. 5kΩ
16. 10kΩ
17. 15kΩ
18. 20kΩ
19. 25kΩ
20. 50k

Note: Contact Micronor sales for configurations >600W

Available Resistances per Power Rating:
DPM20 (20W) 5Ω – 15kΩ
DPM60 (60W) 2Ω – 20kΩ
DPM170 (170W) 2Ω – 60kΩ
DPM300 (3000W) 2Ω – 80kΩ

Quick Ship Configurations
MR266-22-B8 Isolated 4-20mA input and Output, DPM60, and 100Ω potentiometer
MR266-44-B8 Isolated 0-10V input and Output, DPM60, and 100Ω potentiometer

Ordering Info Reset Switch / Override LED Assembly

Other Accessories
HPFF00700 Front Panel Mount Remote Potentiometer Assembly
1803659 Replacement Phoenix Mini Combicon Plug

MICRONOR SENSORS INC.
2085 Sperry Ave, Suite A-1, Ventura, CA 93003 USA
+1 805 389 6600 sales@micronor.com
www.micronor.com

MICRONOR AG
Pumpwerkstrasse 32, CH-8105, Regensdorf, Switzerland
+41 44 843 4020 sales@micronor.ch
www.micronor.com

References

• Products - Micronor Sensors Inc.

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