WB-MR3xV and WB-MR6xV Modbus Relay Modules/en

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MR3HV/I, MR6HV/I Relay modules

Three-and six-channel relay modules of the WB-MR3xV and WB-MR6xV series are designed for industrial and home automation systems. Modules, depending on the type, are designed for commutation of general-purpose power load, including inductive and capacitive: control of LED lamps, incandescent lamps, switching power supplies, etc.

The modules are designed for a load of 16A (nominal 10A) and can be used without intermediate contactors. The module has an input that simultaneously disconnects the entire load.

Models

The WB-MR3xV series features three-channel models, and the WB-MR6xV series features six-channel models, with different input types (dry contact and 230V AC), models to control different loads.

The naming scheme: {/class= " wikitable" !WB-MR[3/6]xV !N ! ! colspan="2" |XX !/ ! colspan="2" |YY |- | rowspan= "4" | |Channels | | colspan= " 2 " | input Type | | colspan= " 2 " | relay output Type |- | rowspan= "3" | 3 or 6 | |LV | inputs for "dry contact" signals (Low Voltage) | |I | SPDT configuration, normally open/normally closed contacts), large inrush current (I) |- | |HV | 230V AC inputs (High Voltage) | |S | SPST configuration (normally open contact), ultra-high starting current, relay with special design contacts (S) (contact material includes tungsten) |- | | | | |R |(SPDT configuration, normally open/normally closed contacts), for resistive load (R) (available on request) |}

Outputs

WB-MR3xV relay module contacts

WB-MR6xV relay module contacts

Depending on the module modification, different relay models are used. The table below lists the relay models, their specifications and application conditions. The maximum DC voltage that all relays of the module can switch is 30 V. Each relay contact is protected from arcing when closed/opened by a varistor connected to the common contact "C". Depending on the Modbus register settings, the input status may resume after a power interruption (see #relay operation mode in case of power failure).

Relay parameters

{/class= " wikitable" ! !Modification I !Modification S !Modification R |- |Maximum switching current, 230V AC resistive load | colspan= "3" |16A |- |Maximum switching current, resistive load 30V DC |- |- |16A |- |Maximum switching power for incandescent lamps (230V AC) | |"'3000W"' | |- |Maximum permissible starting current (within 20ms, for contact NO.) |120A |"'165A"' |- |- |Maximum permissible starting current (within 200 microseconds, for contact NO) |165A |"'800A"' |- |- |Contact resistance | colspan= "3" / 100 milliohms |- |Contact material |AgSnO₂ |"'W+AgSnO₂"' |AgSnO₂ |- | Contact configuration |"'SPDT (NO, COM, NC)"' |SPST (NO / COM) |"'SPDT (NO, COM, NC)"' |- |Lifetime: number of switches for load 16A 230V AC, cos φ = 1 |75 000 |12 000 |30 000 |- |Lifetime: number of switches without load |10 000 000 |5 000 000 |20 000 000 |- | Relay model |Hongfa HF115F-I |Hongfa HF115F-S |Omron G2RL-1-E |- |Peculiar properties |Large inrush current, switchable contact group |Very large inrush current |Low price |- |Application | colspan= " 2 " |General purpose Power load, inductive load, capacitive load. Motors, contactors, incandescent lamps,

led lights, switching power supplies, etc. |Resistive load, contactors, capacitive and inductive load

of the low intensity. |}

Outputs

The inputs of the WB-MR3xV and WB-MR6xV modules are connected to screw terminals. Depending on the model, the modules have discrete inputs of different types. In LV modification inputs are organized on the principle of "dry contact". Buttons or switches are connected between the corresponding input of the Inputs unit and the GND. In the HV modification, the inputs determine the presence of a connected phase of the 220 V AC network. Input voltage: 90V — 250V AC. External buttons and switches are connected between the corresponding input of the Inputs unit and the phase. The 230V neutral (N) is connected to the terminal "N" of the module.

Technical specifications

Parameter	Value
colspan= " 2 " / Power
Supply voltage	9-24V DC
Power consumption	Idle mode (with all relays off) — 0.5 W With all relays on-WB-MR3xV: 1.5 W; WB-MR6xV: 3W Peak value-up to 8W for 20ms
"'Outputs"'
Output type	Mechanical relay contacts
Output configuration	3 or 6 outputs connected to relay contacts
Configuration of contacts of each output	Two-position, normally open in modification "'S"' (C and NO) Two-position with switching in modifications "'I"' and "'R"' (NC C NO)
Maximum switching voltage, AC	250 V
Maximum switching voltage, DC	30 V
Maximum switching current per channel	see the table in # relay Parameters
Contact resistance	< 100 milliohms
Voltage isolation between the controller and the output	1500 V (RMS)
Term life:	see table under # relay Parameters
colspan= " 2 " / Inputs
Number of inputs (Inputs 1— 4)	4 (3+1) for WB-MR3xV 7 (6+1) for WB-MR6xV
Input type (WB-MR3LV and WB-MR6LV)	"Dry contact", group isolation. The input voltage is ~4.5 V. Input short-circuit current ~2mA.
Input type (WB-MR3HV and WB-MR6HV)	"Network availability", group isolation. Input voltage: 90V — 250VAC/DC. The current is ~0.5 mA.
Functions	General purpose inputs Signal count Direct control of relay channels Simultaneous shutdown of the entire load Remember the relay status in case of power cuts
colspan= " 2 " / Control
Management interface	RS-485
Interface isolation	Uninsulated
Communication protocol	Modbus RTU, address is programmed, factory settings are indicated on the sticker
RS-485 interface parameters	set programmatically via Modbus registers; < br> default: speed-9600 bps; data-8 bits; parity — none (N); stop-bits-2
Ready for operation after power supply	~0.03 c
colspan= " 2 " / dimensions
Width, DIN units	3
Overall dimensions (L x W x H)	WB-MR3xV: 53.3 x 90.2 x 57.5 mm WB-MR6xV: 106.25 x 90.2 x 57.5 mm
Indication
Power and data exchange indication	Yellow status led
Relay channel status indication	Green LEDs, WB-MR3xV: 1-3, WB-MR6xV: 1-6
/ operating Conditions
Air temperature
Relative humidity	Up to 92%, non-condensing moisture

Overall dimensions

WB-MR6xV overall dimensions: 106,25 x 90,2 x 57,5 mm (L x W х H)

WB-MR3xV overall dimensions: 53,3 x 90,2 x 57,5 mm (L x W х H)

Installation of WB-MR3xV and WB-MR6xV modules

The relay module is mounted on a standard 35 mm wide DIN rail and occupies a width of 3/6 DIN modules.

The screwless terminal blocks on the relay Board are used to connect power lines, control (RS-485) and input contacts. When used with the mounting lugs of the type NSVI to install wires into screwless terminals it is necessary that the diameter of the insulated cuff does not exceed 3.6 mm, wire size — 0.75 mm², and the length of the conductive sleeve — 5-6 mm. Screw terminals accept wire cross-section 2,5—4 mm². The cross section of the wire must correspond to the switched load.

It is important not to exceed the recommended current of 16 A, when connecting switched devices to the KX relay contacts.

The current flowing when a button or switch is shorted is small, so the type of button or switch can be anything. Despite the built-in anti-rattle protection, choose quality buttons and switches to avoid false positives due to bad contacts. Caution-in the HV modification, high voltage is present at the terminals!

If the device is the last on the RS-485 line, a 120 Ohm terminator resistor must be installed between its inputs A and B. Practice shows that in the case of bench tests with a small length of the RS-485 line and a small number of devices, the terminator on the last device in the line can not be installed.

The module must be installed in such a way as to meet electrical safety requirements and prevent accidental contact of contacts under high voltage. The module must be operated under recommended environmental conditions.

The Installation and connection sample of module WB-MR3HV/I. Choice of quality power supply is very important for the operation of the module. A button with yellow wires connected to input "4" of the module disables all three channels simultaneously

The installation and connection sample of module WB-MR6HV/I.Choice of quality power supply is very important for the operation of the module. A button with yellow wires connected to input "7" of the module disables all three channels simultaneously

Relay operation mode in case of power failure

Depending on the value written to the storage register 0x06, after the power is turned off and restored, the relays will remain off (if the value is 0, or turn on those that were turned on before the power interruption if the register has a value of 1). This feature appeared in the modules with the firmware, starting with version 1.5.3.

Modbus Control

Details of the work with the module via Modbus Protocol is written in Relay Modules Modbus Management . You can also find a map of the device registers there.

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