Rayleigh Instruments RI-D440

Compatibility

Compatible with EpiSensor Edge over Modbus RTU

The RI-D440-G-C is compatible with EpiSensor Edge over Modbus RTU on its RS485 terminals, read through a ZMB-31 Modbus Interface or a Gateway serial port. Rayleigh publishes the register list with decimal and hex addresses, data structure, length and unit.

RI-D440-G-C, read with Rayleigh's register document RI-D440-C-COMM V01. Site check: read Voltage V1-N from wire address 0x0000 as a float with the words reversed and compare it with the display. Read-only monitoring: no writes to the password, settings, resets or factory default registers.

Connect it with

• Modbus Interface ZMB-3X From €399 ex VAT Configure
• Gateway ZGW-20 From €899 ex VAT Configure

Models

Specifications

The RI-D440 shows voltage, current, power factor, frequency, power, maximum demand and active, reactive and apparent energy on a white backlit LCD with an energy pulse LED. It connects three phase four wire with three easywire CTs or single phase on L1, L2 or L3, and a Voltage OUT connector daisy-chains its supply to up to 32 meters.^2, 3

Models

RI-D440-G-C with one pulse output and RS485 Modbus; instruction manual V02 also covers RI-D440-G-MB with M-Bus.^2, 3

Accuracy

Voltage and current ±0.5% of full scale, frequency ±0.1% of full scale, active, reactive and apparent power 1%, power factor ±0.01 of unity; active energy class 1 to IEC/EN 62053-21, reactive energy class 2 to IEC/EN 62053-23.^2, 3

Inputs

Instruction manual V02: 3 × 60 to 300 V AC L-N (104 to 520 V AC L-L), 45 to 65 Hz, CT primary 5 to 10000 A, easywire 330 mV input, VT primary 100 V to 10 kV and secondary 100 to 500 V. The 2019 datasheet gives 100 to 240 V L-N and 173 to 415 V L-L.^2, 3

Communication

RS485 Modbus RTU, slave ID 1 to 255, 300 to 19200 bit/s, no, odd or even parity, 1 or 2 stop bits, response time 100 ms or less; factory settings slave ID 1, 9600 bit/s, no parity, 1 stop bit; daisy chain of up to 32 meters within 500 m.^1, 2, 3

Supply

Self-supplied from V1, under 8 VA; the Voltage OUT connector feeds up to 31 further meters, with the fuse rating set by the number of meters.^2, 3

Pulse output

One kWh pulse output, 5 to 27 V DC, 100 mA maximum; pulse weight 0.01 to 9.99 kWh per pulse (0.10 from the factory) and duration 50 to 300 ms (200 ms from the factory) in manual V02.^2, 3

Housing

Four-module DIN 43880 housing for 35 mm rail, self-extinguishing polycarbonate (UL94 V-0), IP54 front and IP20 terminals, under 210 g; RJ45 current inputs and pluggable screw-clamp voltage, RS485 and pulse terminals. It must be installed in a suitable IP-rated enclosure, indoors.^2, 3

Environment

Operating -10 to +55 °C, storage -20 to +75 °C, 0 to 85% RH non-condensing; installation category III (300 V L-N), protection class II, pollution degree 2, altitude up to 2000 m.^2, 3

Conformity

EMC to IEC/EN 61326-1, EN 55011 class A and IEC/EN 61000-4-2, -3, -4, -5, -6, -8 and -11; accuracy to IEC/EN 62053-21 and -23; safety to IEC/EN 61010.³

Interface

Documented measurements and integration boundaries for RI-D440.

• Rayleigh prints a decimal address from 30000 beside a hex start register for every row: Voltage V1-N is 30000 at 0x00 and Total net kWh is 30058 at 0x3A. The hex value is the zero-based address on the wire, and the decimal number is that address plus 30000. The settings rows start again at 40000 with hex 0x00.
• The header lists functions 3 and 4, and the Function column marks the measurement rows 3 and the settings rows 4. The settings rows are read and written, so the column reads as the 3X input and 4X holding tables rather than a function code. Read the measurements with FC04 first; if the meter answers with an illegal function exception, read the same address with FC03.
• FLOAT REVERSE WORD is a 32-bit IEEE float in two registers with the low-order word first: Rayleigh's example places the least significant half of Total net kWh in register 30058 and the most significant half in 30059. In Edge, choose a float with the words swapped.
• Voltages V1-N, V2-N and V3-N at 30000, 30002 and 30004 (hex 0000, 0002, 0004) and their average at 30006; V1-2, V2-3 and V3-1 at 30008, 30010 and 30012 and their average at 30014; all in V.
• Currents I1, I2 and I3 at 30016, 30018 and 30020 (hex 0010, 0012, 0014) and average current at 30022 (hex 0016), in A.
• Power: kW1 to kW3 at 30024 to 30028, kVA1 to kVA3 at 30030 to 30034 and kVAr1 to kVAr3 at 30036 to 30040; Total kW at 30042 (hex 002A), Total kVA at 30044 and Total kVAr at 30046, in kW, kVA and kVAr. Power factor PF1 to PF3 at 30048 to 30052 and average PF at 30054; frequency at 30056 (hex 0038) in Hz.
• Energy: Total net kWh at 30058 (hex 003A) and Total net kVArh at 30062 (hex 003E). The map has no separate import or export counters and no apparent energy register, so a circuit that exports needs another meter for export energy.
• 30064 (kW Active Power) and 30072 (kVA Apparent Power) are separate rows from Total kW and Total kVA, and 30134 and 30138 carry the existing maximum kW and kVA. The map does not say whether 30064 and 30072 are present or demand values, so compare them with the Max MD display pages before relying on them. Serial number at 30132 (hex 0084), two registers in hex.
• Settings start at 40000: password at 40000 (default 1000), network selection at 40001, CT primary at 40003, PT secondary and primary at 40004 and 40005, slave ID at 40007, baud rate at 40008 (5 is 9600), parity at 40009 and stop bit at 40010. Factory default (40012), Reset kWh (40013), Reset kVArh (40015) and the maximum demand resets (40037, 40041) are writes; keep all of them out of a monitoring poll.

Setup

1. Identify the model

   Check that the label reads RI-D440-G-C. The RI-D440-G-MB has M-Bus instead of Modbus.

2. Read the communication settings

   Hold the configuration button for 3 seconds and enter the password (1000 from the factory), then step to settings 7 to 10: slave ID, baud rate, parity and stop bit. Enter the same values in the Edge serial client or the ZMB-31.

3. Wire the RS485 pair

   Connect A (+) and B (-) in a daisy chain of at most 32 meters and 500 m, with no star connections.

4. Find the function code

   Read two registers from wire address 0x0000 with FC04. If the meter answers with an illegal function exception, repeat the read with FC03 and use that function for every measurement.

5. Check the word order

   Decode Voltage V1-N with the second register as the high word and compare it with the Avg Voltage and phase voltage pages. If it does not match, the read is on the wrong address or the words are not swapped.

6. Add energy and power

   Add Total net kWh at wire address 0x003A, then total and phase power and power factor, and compare the energy with the kWh display. Never write to the password, reset or factory default registers.

Common questions

Which address do I send for RI-D440 register 30058?

Send 0x003A. Rayleigh prints a hex start register beside every decimal address, and the decimal number is 30000 plus that hex value: Voltage V1-N is 30000 at 0x00 and Total net kWh is 30058 at 0x3A. A client that numbers registers from one enters the hex value plus one.¹

What word order do the RI-D440 floats use?

The low-order word comes first. Rayleigh calls it FLOAT REVERSE WORD and shows Total net kWh with its least significant half in register 30058 and its most significant half in 30059. Set the Edge float point to swap words, then check one value against the display.¹

Does the RI-D440 report import and export energy separately?

Not over Modbus. RI-D440-C-COMM V01 has Total net kWh at 30058 and Total net kVArh at 30062 and no import, export or apparent energy registers. Where export matters, choose a meter whose map has separate import and export counters.¹

Does the RI-D440 use function 03 or function 04?

Rayleigh's header lists functions 3 and 4, and its Function column marks the measurements 3 and the settings 4. Because the settings are read and written, the column reads as the register table rather than a function code. Start with FC04 for the measurements and fall back to FC03 on an illegal function exception.¹

Can the RI-D440 run a star network?

Not for Modbus. Rayleigh's instruction manual marks daisy chain as the only Modbus topology and star as M-Bus only, with at most 32 meters within 500 m.²

What happens if V1 is lost?

The meter stops, because it takes its supply from V1 only. Meters chained from its Voltage OUT connector lose their supply too, so plan the fusing and the voltage reference with that in mind.^2, 3