ES-2664 Rev.17

M3LDY

Space-saving Signal Conditioners M3-UNIT Series

CURRENT LOOP SUPPLY

(linearizing; field- and PC-configurable)
Functions & Features
• Powers a 4 – 20 mA DC current loop
• Shortcircuit protection
• Applicable to smart transmitters
• PC-programmable linearization data (100 points and square root extraction)
• Easy ‘One-Step Cal’ calibration using the front three control buttons without needing a PC
• Front control button function can be locked
• Loop testing via the PC configuration software
Typical Applications
• Various 2-wire transmitters
• Linearizing weir flowmeter output to provide a linear-to-volume signal
• Isolator application (0 – 20 mA input)
• Square root extraction for differential pressure transmitter
• Ideal for use as a fast solution, multifunctional spare part
 

MODEL: M3LDY–R/[1][2]

ORDERING INFORMATION

• Code number: M3LDY-R/[1][2]
Specify a code from below for each of [1] and [2].
  (e.g. M3LDY-R/A/UL/Q)
• Specify the specification for option code /Q
  (e.g. /C01)
Orders will be shipped with default factory settings (4 – 20 mA input / 4 – 20 mA output).

INPUT

Current
0 – 20mA DC (Input resistance 274.9 Ω)

OUTPUT – Field-selectable

Current
0 – 20 mA DC
Voltage
-2.5 – +2.5 V DC
-10 – +10 V DC

POWER INPUT

DC Power
R: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

[1] CONFIGURATION OPTIONS

A: PC and field configurable
B: Field configurable

[2] OPTIONS (multiple selections)

Standards & Approvals
blank: CE marking
/UL: UL approval, CE marking
Other Options
blank: none
/Q: Option other than the above (specify the specification)

SPECIFICATIONS OF OPTION: Q

COATING (For the detail, refer to our web site.)
/C01: Silicone coating
/C02: Polyurethane coating
/C03: Rubber coating (UL not available)

RELATED PRODUCTS

• PC Configurator cable (model: MCN-CON or COP-US)
• PC configurator software (model: M3CFG)
Downloadable at our web site.

GENERAL SPECIFICATIONS

Construction: Small-sized front terminal structure
Connection: Euro type connector terminal
(applicable wire size: 0.2 to 2.5 mm2, stripped length 8 mm)
Housing material: Flame-resistant resin (gray)
Isolation: Input to output to power
Overrange output: -15 to +115 %
Zero adjustment: -15 to +15 % (front)
Span adjustment: 85 to 115 % (front)
Status indicator LED: Tri-color (green/amber/red) LED; Blinking patterns indicate operation status of the transmitter.
Configuration
PC configurator: (Model: M3LDYCFG) via Windows PC connected to th front jack.
Programmable features include:
• Input range
• Output type and range
• Zero and span adjustments
• Linearization
• Loop test output
(Refer to the instruction manual)
‘One-Step Cal’ calibration: With I/O type and the full-scale range configured via the internal DIP switches, precise 0 % and 100 % ranges are calibrated via the front control buttons with a help of LED. Also I/O calibration and fine adjustment are available with a PC.
Configurator connection: 2.5 dia. miniature jack;
RS-232-C level

SUPPLY OUTPUT

■ SUPPLY OUTPUT (across the terminals 1 – 2)
Output voltage: 24 – 28 V DC with no load
19 V DC minimum at 20 mA
Current rating: ≤ 22 mA DC
Permissible load resistance:
LR (Ω) ≤ (19 – Min. Operational Voltage) V ÷ 0.02 A
• Shortcircuit Protection
Current limited: 35 mA max.
Protected time duration: No limit

INPUT SPECIFICATIONS

■ DC Current:
Input resistance: Resistor incorporated
 (24.9 Ω for isolator use)
Maximum range: 0 – 20 mA DC
Minimum span: 2 mA
Offset: Lower range can be any specific value within the input range provided that the minimum span is maintained.

OUTPUT SPECIFICATIONS

■ DC Current
Maximum range: 0 – 20 mA DC
Minimum span: 1 mA
Conformance range: 0 – 24 mA DC
(Negative overrange current below 0 mA is not available.)
Offset: Lower range can be any specific value within the output range provided that the minimum span is maintained.
Load resistance: Output drive 12 V maximum
■ DC Voltage
Narrow Spans
  Maximum range: -2.5 – +2.5 V DC
  Minimum span: 250 mV
  Conformance range: -3 – +3 V DC
Wide Spans
  Maximum range: -10 – +10 V DC
  Minimum span: 1 V
  Conformance range: -11.5 – +11.5 V DC
Offset: Lower range can be any specific value within the output range provided that the minimum span is maintained.
Load resistance: Output drive 1 mA maximum

LINEARIZATION (/A only)

Type selection and data programming: PC Configurator Software
• No Linearization: The output is proportional to the input.
• Segment Data: 100 points max. within the range of -15.00 to +115.00 % input or output represented as percentage of full-scale
Low-end cutout: Low-end cutout point selectable within the range of 0 to 100 %. For the input lower than the low-end cutout point, the output signal equals 0 %.
• Square Root Extraction
Low-end cutout: Low-end cutout point selectable within the range of 0 to 100 %. For the input lower than the low-end cutout point, the output signal is linear to the input.

INSTALLATION

Power consumption
•DC: Approx. 3 W
Operating temperature: -25 to +65°C (-13 to +149°F)
Max. 55°C (131°F) for UL approval
Operating humidity: 0 to 95 %RH (non-condensing)
Mounting: DIN rail
Weight: 100 g (0.22 lb)

PERFORMANCE

Accuracy: Input accuracy + output accuracy
  Input accuracy: ±0.06 % of input range
  Output accuracy: ±0.04 % of output range
(Input and output accuracy is inversely proportional to the span)
Temp. coefficient: ±0.015 %/°C (±0.008 %/°F) of max. span
Response time: ≤ 1 sec. (0 – 90 %)
Line voltage effect: ±0.1 % over voltage range
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 1500 V AC @ 1 minute
(input to output or power to ground)
500 V AC @ 1 minute (output to power)

CALCULATION EXAMPLES OF OVERALL ACCURACY

[Example] Input 4 – 20 mA, Output 4 – 20 mA
Input accuracy = Range 20 mA ÷ Span 16 mA × 0.06 % = 0.075 %
Output accuracy = Range 20 mA ÷ Span 16 mA
× 0.04 % = 0.05 %
Overall accuracy = 0.075 + 0.05 = 0.13 %
(Segment gain < 1. Multiply the calculated result by the gain when exceeding 1.

STANDARDS & APPROVALS

EU conformity:
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
RoHS Directive
Approval:
UL/C-UL general safety requirements
  (UL 61010-1, CAN/CSA-C22.2 No.1010-1)

EXTERNAL VIEW

For M3LDY-R/A, the DIP switch setting is required to select output and input types before setting a precise output range using the PC configurator software.
For detailed information on the configuration and calibration, refer to the instruction manual.

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM