Description
The M850-LRC is a unique combination of a 3 phase digital universal metering system and Rogowski coils. It can be used on any voltage system with a wide range of inputs, and incorporates a universal AC or DC auxiliary power supply.
One unit covers the majority of applications and wiring systems without any modification required, making the M850-LRC ideal for stocking. The M850-LRC has a LCD display with user selectable options of Blue, Green, or White back-lighting.
The M850-LRC supports up to three Rogowski coils for measuring current. By combining the meter with one or more M240-RCM coils the M850 can measure current up to 4000A. To maintain accuracy and resolution, three ranges of the meter can be ordered: 10-500, 40-2000A or 80-4000A. Example: Nominal current is 400 Amps, you would choose the 10‐500A meter.
Using M240-RCM coils allows for extremely easy installation compared to conventional CTs, making them ideal for fitting in difficult to reach installations, or for retrofitting applications. Also, the wide current range offers a cheaper solution than standard current transformers for high primary currents.
Communications
An integrated RS485 port enables the M850 to communicate with up to 31 other meters or controllers using the popular Modbus RTU protocol. The protocol allows the M850 to be used with PC, PLC, RTU, Data loggers and Scada programs.
Display
The unique 3 colour option LCD FSTN display is designed to be read in a variety of conditions over wide viewing angles and distances.
There are three colour options of the back lighting available: Blue, Green, or White; which are selectable through the front panel.
Coil
The M240-RCM is available in a variety of standard lengths to suit most installation scenarios. Special lengths are available on request. For more information please see the MultiCore brochure.
General Specification
| Rated Un | 28V – 330V L-N 48V – 570V L-L (280V L-N nominal) |
| Overload | 800V continuous |
| Burden | 0.5VA |
| Cut-off Point | 2% Un nominal |
| Rated In | A1: 10 – 500A |
| A2: 40 – 2000A | |
| A3: 80 – 4000A |
Auxiliary
| Input | 100 – 440V AC 45 – 65Hz 100 – 420V DC 19-69V DC (optional) |
| Burden | < 10VA |
Insulation
| Installation Category | III (480 VAC ph/ph) |
| Degree of Pollution | 2 |
| Rated Impulse Withstand Voltage | IEC 60947-1-V imp: 4kV |
| Meter Front | Class II |
| Electrical Security | IEC 61010-1 |
| Inputs + Aux to Case | 4 kV rms 50 Hz for 1 min |
| Inputs + Aux to RS485 | 3kV rms 50 Hz for 1 min |
| Inputs + Aux to Relay | 1.5kV rms 50 Hz for 1 min |
| LV DC Aux to Inputs | 1.5kV rms 50 Hz for 1 min |
Electromagnetic compatibility
| Electrostatic Discharges | IEC 61000-4-2-Level III |
| Radiated Radio-Hz Fields | IEC 61000-4-3-Level III |
| Electrical Fast Transient / Bursts | IEC 61000-4-4-Level III |
| Impulse Waves | IEC 61000-4-5-Level III |
| Conducted Disturbances | IEC 61000-4-6-Level III |
| Voltage Dips & Short Interruptions | IEC 61000-4-11 |
| Conducted and Radiated Emissions | CISPR11-Class A |
Display
LCD Update time of 1 second, back-light colour of blue, green or white.
Standard Outputs
Integrated RS485 (Modbus std or BACnet) with baud rates of :76800, 57600, 38400, 19200, 9600, and 4800. Parity of Odd, Even, and no parity supported. Response time is <10mS.
An integrated pulsed output, solid-state relay module is included. It can be set for W.h or VAr.h.
Options
- 19V-69V dc auxiliary (see ‘Insulation’)
- BACnet
Environmental
| Working Temperature | -20 to +70°C |
| Storage Temperature | -30 to +80°C |
| Relative Humidity | 0 – 95% non condensing |
| Shock | 30g in 2 planes |
Enclosure
| Standard DIN Case | DIN 96×96 |
| Panel Mount | Via 4 Retaining Brackets |
| Panel Cut-out | 92+0.8mm x 92+0.8mm |
| Material | Black Polycarbonate |
| Terminals | Current 6mm² |
| All others 2.5mm² | |
| IP Rating Front | IP52 / Nema 12 |
| IP Rating Case | IP30 / Nema 1 |
| Weight | 0.25kg / 0.66lb |
Case
Connection
Coil Connections
k = Red wire
l = Blue wire
s = Screen wire
Ordering Information
Call us now on: +44 1922 640003