FRER MCOMV 48VDC DC Voltage Isolation Transducer

Marke: FRER (Italien)

Vollständiges Modell: MCOMV, Input 0~48VDC, DIN-Schienenmontage DC voltage isolation transducer. It converts DC voltage signal into standard 4-20mA analog signal for SPS/DCS system acquisition.

Kernparameter (MCOMV;48VDC)

Eingang: 0 ~ 48V DC (50% Überlastfähigkeit)

Ausgabe: 0~20mA / 4~20mA (Standard industrial current loop)

Max Output Load: 750Oh

Auxiliary Supply: 20~60Vac/dc (Wide AC/DC power supply); 220VDC version available as option

Isolierung: Input-Output-Power three-way galvanic isolation

Montage: DIN rail snap mounting

Genauigkeitsklasse: 0.5

Ansprechzeit: <200MS

Anwendung: DC busbar, battery pack, -48V telecom power cabinet voltage measurement

Modelldefinition

MCOMV: FRER legacy model code for DC voltage transducer; new replacement series MCOVC

;48VDC: Input range 0~48V DC

Other ranges available in same series: MCOMV;60mV DC, MCOMV;60VDC, MCOMV;300VDC

Typische Anwendungen

1. -48V battery bank voltage monitoring for telecom base stations
2. DC panel & energy storage cabinet DC bus voltage acquisition
3. Industrial power supply & electrochemical power source voltage transduction
4. DC system signal isolation measurement in power plants & Fabriken

Ersatzmodelle

Original-Hersteller-Upgrade: MCOVC1 (for MCOMV 0~300V), MCOVC2 (Dual retransmission output)

Inländische Alternativen: Phoenix Contact, Pepperl+Fuchs, Suzhou Xunpeng and other DC voltage isolation transducers (0-48V-Eingang, 4-20mA-Ausgang)

Verkabelungsrichtlinien

1. Input side: DC voltage signal, observe polarity strictly
2. Output side: 4-20mA current loop, connect to AI module, normally 2-wire connection at PLC side
3. Auxiliary power: 20~60V AC/DC wide range, compatible with 24V/48V DC panel & AC220V

Important Distinction: MCOV (SPD maximum continuous operating voltage) ≠ MCOMV (FRER transducer). Abbreviation confusion frequently occurs.

FRER MCOMV;48VDC Complete Datasheet Parameter Table

Produkt: DC voltage isolation transducer (Obsolete legacy MCOMV, replacement series MCOVC)

Modelldefinition: MCOMV = DC voltage transducer; ;48VDC = Input range 0~48VDC

🔹 Electrical Specifications

🔹 Environmental Conditions

🔹 Mechanical & Gehäuse

🔹 Model Portfolio (Available Ranges of MCOMV Series)

🔹 Safety & Standards

Zertifizierung: CE, Konform mit EN 61010-1

Schutz: Output current limiting, limited reverse polarity protection for input

Anwendungskategorie: Industrial DC busbar, telecom -48V battery pack, DC panel voltage acquisition

🔹 Wiring Summary

1. Eingang + / Eingang -: Measured DC voltage, strict polarity observation required
2. Ausgabe + / Ausgabe -: 4~20mA current loop, two-wire connection to PLC AI channel
3. Zu + / Zu -: Transducer auxiliary power supply 20~60V AC/DC

🔹 Model Change Note

MCOMV is legacy FRER code, eingestellt. Direkter OEM-Ersatz: MCOVC1 (single channel DC voltage transducer) with identical specs, pin assignment and mounting dimension.

🔹 Troubleshooting Reference

1. Keine Ausgabe: Check auxiliary power, Klemmendichtheit, input polarity
2. Fixed 4mA output: Input open circuit or signal below lower limit
3. Output stuck at 20mA: Over-range input or shorted input wiring
4. Lesedrift: Check ground interference and verify isolation integrity

FRER MCOMV;48VDC Calibration Description

Abschluss: Metrological calibration is available for certification; No external zero/span trim potentiometer on unit. On-site opening and adjustment of zero/span are prohibited. It is a factory-calibrated analog isolation transducer.

1. Genauigkeitsklasse & Calibration Differentiation

Nameplate marked Class 0.5: Maximum permissible full scale error ±0.5%FS under reference condition 25℃.

✅ Metrological Calibration (Gestattet):

Use standard DC voltage source + high precision milliammeter for multi-point comparison test at 0%, 25%, 50%, 75%, 100%. Can be sent to 3rd-party metrology laboratory for calibration certificate, to verify whether performance remains within Class 0.5.

❌ On-site trimming (Not Supported):

No external Zero / Span access hole on MCOMV legacy housing; PCB trim potentiometers are factory locked. Manufacturer does NOT recommend opening housing for on-site adjustment. Opening voids factory warranty and damages insulation isolation structure, degrading 2.5kV isolation safety rating.

2. Calibration Test Procedure (Lab / Site Comparison, Test Only, No Adjustment)

DUT: MCOMV;48VDC (0~48VDC Input →4~20mA Output)

1. Connect auxiliary power 20~60V DC, warm up ≥15 minutes
2. Apply DC voltage sequentially via standard source: 0V, 12V, 24V, 36V, 48V

0V → Theoretical output 4.000 mA

48V → Theoretical output 20.000 mA

3. Insert high precision milliammeter in series into current loop, record As-Found error for each point
4. Pass Criterion: Error ≤ ±0.5%FS for all test points

Full scale span: 16mA corresponds to 48V; 1%FS = 0.16mA

3. Remedial Actions If Drift Exceeds Tolerance

If calibration shows error out of Class 0.5 Toleranz:

1. Replacement preferred (MCOMV discontinued). Recommended upgrade MCOVC1;48VDC, Stift & dimension compatible;
2. Return to FRER factory for re-calibration (hohe Kosten & long lead time);
3. Domestic alternative transducers: Equipped with external Z/S potentiometer, field zero & span adjustment available.
4. Calibration Feature of New MCOVC (MCOMV Replacement)

MCOVC series also has no external zero/span potentiometer, factory calibrated only, metrological verification permitted, no hardware trimming on site.

5. Recommended Calibration Interval

For DC panel, telecom -48V battery monitoring, power plant applications requiring traceable metrology: Annual calibration every 12 Monate.

FRER MCOMV;48VDC Accuracy Calibration Precautions

Core Recap: Only metrological verification allowed (accuracy validation). No external zero/span trim potentiometer. Opening enclosure for adjustment forbidden; Klasse 0.5, tolerance ±0.5%FS full scale.

1. Umgebungsbedingungen (Invalid Calibration If Not Satisfied)
2. Umgebungstemperatur: Prefer 25℃±2℃ constant temperature; record actual temperature if test off-nominal. Temperature drift ≤100ppm/℃ will introduce extra error.
3. Luftfeuchtigkeit: 5%~95 % relative Luftfeuchtigkeit, Kondensation verboten. Condensation reduces isolation voltage, causes leakage error or permanent damage.
4. EM Environment: Keep away from VFD, Schütze, high-power cables and strong magnetic field. Heavy interference leads to 4~20mA jitter and false failure judgement.
5. Stabilization: Mount transducer on DIN rail, power on and warm up ≥15min until thermal stabilization before reading.
6. Standard Instrument Requirements (Reference instrument accuracy better than DUT)

For Class 0.5 transducer, follow the 1/3 rule (instrument uncertainty ≤1/3 of DUT allowable error)

1. Standard DC Voltage Source: Accuracy better than 0.15 Klasse, 0~48VDC output, low ripple
2. Standard Milliammeter: DC current measurement accuracy better than 0.15 Klasse, connected in series in current circuit
3. General multimeter cannot be primary standard (insufficient accuracy), only auxiliary reference

Instruments must be within valid calibration period with certificate to ensure metrology traceability.

III. Verdrahtung & Power Supply Notes

1. Hilfsenergie: Stable 20~60V DC supply with low ripple. Avoid unstable switching power supply for temporary test. Fluctuating supply introduces output drift.
2. Eingangsschaltung: Strict polarity for input +/-; limited reverse protection exists but long-time reverse energizing not recommended. Keep input wiring short; shielded cable with single-end grounding to reduce common-mode interference.
3. Output Current Loop

Insert standard ammeter in series within 4~20mA loop

Total loop resistance shall not exceed 750Ω (ammeter internal resistance + cable resistance). Excessive load prevents reaching 20mA full scale and leads to false failure.

Tight wiring terminals; loose contact causes reading fluctuation.

4. Erdung: Avoid multiple grounding for transducer, standard source and meters to prevent ground loop and common-mode voltage measurement error.
5. Calibration Points & Betriebsrichtlinien

Recommended test points: 0V, 12V, 24V, 36V, 48V (0%, 25%, 50%, 75%, 100%FS)

1. Upscale test: Ramp input from 0V up to full scale 48V, record output for each point
2. Downscale test: Ramp down from 48V to 0V for return test and hysteresis error inspection
3. Wait 3~5 seconds at each test point for reading stabilization before recording
4. Do not continuously apply full 48V for long duration. Though 50% continuous overload is supported, long overvoltage accelerates aging. Transient 2× overload only for impulse test and not used for accuracy calibration.
5. Error Calculation: FS =16mA full scale span. Error=(Measured Value − Theoretical Value)/FS ×100%. Criterion ±0.5%FS.
6. Sicherheit & Geräteschutz
7. Three-way Isolation: Eingang, output and power isolated at 2.5kV. Do NOT short input and output during test, isolation structure will be damaged.
8. Enclosure opening prohibited: Internal PCB potentiometer factory locked. Opening destroys insulation, voids warranty and compromises isolation rating with safety hazard. Even if trimmed, FRER factory does not recognize field adjustment, and metrology certificate will not accept on-site hardware modification.
9. Moderate torque on terminal screws; avoid over-tightening which strips threads and damages PCB.
10. Datenaufzeichnung, Judgement & Disposition
11. Record items: Umgebungstemperatur & Luftfeuchtigkeit, instrument ID/certificate number, auxiliary supply voltage, forward/backward readings of all points and calculated error
12. Pass Criterion: All forward & return test point errors ≤ ±0.5%FS to be qualified; hysteresis error recorded together
13. Out-of-tolerance handling: No on-site correction possible for this device. Optionen: Replace with MCOVC1;48VDC compatible model or return to factory for recalibration. Do NOT use PLC AI channel software offset compensation as substitution of transducer calibration (only temporary engineering compensation and not accepted as metrology compliance evidence).

VII. Häufige Fallstricke

❌ Use PLC built-in AI reading as calibration reference: PLC AI module has inherent error and cannot serve as metrology standard

❌ Neglect load resistance: Loop total resistance＞750Ω, full scale cannot reach 20mA and false failure occurs

❌ Read data without warm-up: Components thermally unstable, temperature drift error introduced

❌ Multiple grounding, ground loop interference and output fluctuation

❌ Open housing and adjust internal potentiometer: Not accepted by metrology and isolation invalidated

Cross-Brand Model Comparison Table for MCOMV;48VDC (FRER)

Original Spec: DIN-Schienenmontage, 0~48VDC input /4~20mA output, 3-way galvanic isolation (Input/Output/Power), Klasse 0.5, Zu. Supply 20~60VAC/DC, Max Load 750Ω, No external zero/span adjustment

Auswahlpriorität: OEM Upgrade Import Equivalent Domestic Industrial Grade (Field Z/S adjustable, preferred for engineering replacement)

Brand Recommended Model Key Matching Points Differences Application Scenario
FRER (OEM) MCOVC1;48VDC Fully compatible;0~48VDC,4-20mA,3-Weg Isolation,22.5mm narrow DIN rail,20~60V AC/DC supply,Class0.5;Stift & dimension match Still no external potentiometer, factory calibrated, no field trimming Retrofit cabinet where terminal layout cannot be modified, projects requiring metrology certification
Phoenix MACX MCR-VAC (Config: DC 0~48V,4-20mA) 3-Weg Isolation, Class0.5, DIN-Schiene, wide supply Module width12.5mm, software configurable range, field calibration available. Default 24VDC supply, wide voltage version on special order PLC/DCS cabinet, high EMC environment, power station DC panel
Pepperl+Fuchs KFD2-VR4-EX1.20 (Custom input 0~48VDC) 3-Weg Isolation,4-20mA-Ausgang, high industrial noise immunity Standard model defaults to 0~10V, factory customized input range required;Class0.5;Higher price Explosion-proof area, Energiespeicher, telecom -48V monitoring
Acrel BM-DV/I, 0~48VDC input,4-20mA output 3-way isolation,Class0.5,DIN rail,22.5mm,20~60V AC/DC supply,built-in Zero/Span trim potentiometer Domestic brand, field zero & span adjustable;Cost advantage;2.5kV isolation same as FRER Telecom -48V battery,DC panel,batch replacement,field calibration required
Suzhou Xunpeng WP-V,0~48VDC,4-20mA 3-way isolation,Class0.5,DIN rail,wide supply,external zero/span potentiometer Domestic, kostengünstig, metrology certifiable,short procurement lead time Factory technical renovation,bulk transducer replacement
CZ3076 (Custom range 0~48VDC) 1in1out voltage isolation transducer,3-Weg Isolation,4~20mA output,Class0.5 Programmable range,externally adjustable;Strong EMC 12.5mm slim DIN module;Default 24VDC supply,wide voltage optional DCS cabinet,multi-signal centralized acquisition

Selection Priority Description

1. Minimum modification replacement (no terminal rewiring recommended)

FRER MCOVC1;48VDC, direct plug-in replacement for MCOMV;48VDC, identical housing width, terminal assignment and electrical parameters; Einschränkung: still no field zero/span trimming, lab metrology verification only.

2. Preferred for field maintenance (Acrel BM-DV/I recommended)

Matched specs, built-in zero/span potentiometer, on-site calibration available when out of tolerance, solving MCOMV limitation of no field adjustment; 2.5kV isolation meets DC panel & telecom power metrology requirement.

3. High EMC Imported Premium Application

M-SYSTEM, Phoenix MACX series with superior EMC performance, but different terminal layout and module width, cabinet terminal rewiring required, cannot plug & spielen.

Key Difference Summary (For Technical Specification Comparison)

1. Calibration Capability

FRER MCOMV / MCOVC: No external Z/S, metrology verification only, No field hardware adjustment

Acrel/Xunpeng/CZ: External zero & span potentiometer, Field calibration available

Phoenix/M-SYSTEM: Software configuration calibration

2. Stromversorgung

FRER: 20~60V AC/DC wide range; Most imported & domestic standard models default to 24VDC, wide voltage version must be specified at order.

3. Modulbreite

FRER original unit: 22.5mm; Phönix & CZ slim type:12.5mm, less DIN rail slot consumption.

Mandatory Order Remarks (Prevent Wrong Range Shipment)

Must specify below items on PO for all replacement models:

DC Voltage Input:0~48VDC; Ausgabe:4~20mA; 3-way galvanic isolation; DIN-Schienenmontage; Genauigkeitsklasse 0.5; Hilfsenergie:20~60VAC/DC