Danfoss MCX20B2 Electronic Controller Installation Guide

Danfoss MCX20B2 Electronic Controller

General Features

• MCX15B2/MCX20B2 is an electronic controller that stands on the top of the MCX range, thanks to the large number of its inputs and outputs, the enhanced CPU capabilities and connectivity features.
• It holds all the typical functionalities of MCX controllers: programmability, connection to the
• CANbus local network, up to two Modbus RS485 serial interfaces with galvanic isolation.
• Furthermore, it is fitted with an ultra-wide range (24/110/230 V AC) power supply in the same product variant, with USB and Ethernet connection for embedded Web server and IP protocols management.
• It is available in several models, with or without a graphic LCD and with 15 or 20 digital output.

ANALOG INPUTS
NTC, 0/1 V, 0/5 V, 0 / 10 V PT1000, selectable via software| 4| 6
Universal NTC, Pt1000, 0/1 V, 0/5 V, 0/10 V, ON/OFF, 0/20 mA, 4/20 mA, selectable via software| 6| 10
Total number| 10| 16
DIGITAL INPUTS
Voltage-free contact/24V AC sensing| 18| 18
24/230 V AC optoisolated| 4| 4
Total number| 22| 22
ANALOG OUTPUTS
0/10 V DC optoisolated| 6| 6
0/10 V, PWM, PPM selectable via software| 2| 2
Total number| 6| 6
DIGITAL OUTPUTS
SPDT relay 16 A (changeover contacts)| 2| 2
SPST relay 5 A (normally open contacts)| 13| 18
Total number| 15| 20
OTHERS
Power supply 24-110-230 V AC / 40-230 V DC| •| •
Connection for programming key and remote display and keyboard| •| •
Buzzer| –| –
RTC clock| •| •
Modbus RS485 serial interface| x1| x2
CANbus| •| •
Ethernet for Webserver/Modbus TCP| •| •
USB for firmware/application software update and data logging| •| •
Dimensions (DIN modules)| 16| 16
Mounting| DIN rail| DIN rail

General features and warnings

Plastic housing features

• DIN rail mounting complying with EN 60715
• Self-extinguishing VO according to IEC 60695-11-10 and glowing/hot wire test at 960 °C according to IEC 60695-2-12
• Ball test: 125 °C according to IEC 60730-1. Leakage current: ≥ 250 V according to IEC 60112

Other features

• Operating conditions CE: -2060 / UL: 050, 90% RH non-condensing
• Storage conditions: -3080, 90% RH non-condensing
• To be integrated into Class I and/or IL appliances
• Index of protection: IP40 only on the front cover
• Period of electric stress across insulating parts: long
• Suitable for use in environments with a degree of pollution 2
• Category of resistance to heat and fire: D
• Immunity against voltage surges: category Il, category Ill for versions without display
• Software class and structure: class A

Compliance

• CE mark

This product is designed to comply with the following EU standards:

• Low voltage directive LVD 2014/35/EU:
  • EN60730-1: 2011 (Automatic electrical control for household and similar use. General requirements)
  • EN60730-2-9: 2010 (Particular Requirements for Temperature Sensing Controls)
• Electromagnetic compatibility EMC directive 2014/30/EU:
  • EN 61000-6-3: 2007 +A1: 2011 (Emission standard for residential, commercial and light-industrial environments)
  • EN 61000-6-2: 2005 (Immunity for industrial environments)
• RoHS directive 2011/65/EU and 2015/863/EU:
  • N50581: 2012
• UL approval:
  • UL file E31024

General warnings

• Every use that is not described in this manual is considered incorrect and is not authorised by the manufacturer
• Verify that the installation and operating conditions of the device respect the ones specified in the manual, especially concerning the supply voltage and environmental conditions
• This device contains live electrical components therefore all the service and maintenance operations must be performed by qualified personnel
• The device can’t be used as a safety device
• Liability for injury or damage caused by the incorrect use of the device lies solely with the user

Installation warnings

• Mounting position recommended: Vertical
• The installation must be executed according to the local standards and legislations of the country
• Always operate on the electrical connections with the device disconnected from the main power supply
• Before carrying out any maintenance operations on the device, disconnect all the electrical connections
• For safety reasons, the appliance must be fitted inside an electrical panel with no live parts accessible
• Don’t expose the device to continuous water sprays or relative humidity greater than 90%.
• Avoid exposure to corrosive or pollutant gases, natural elements, environments where explosives or mixes of flammable gases are present, dust, strong vibrations or shock, large and rapid fluctuations in ambient temperature that in combination with high humidity can condensate, strong magnetic and/or radio interference (e.g. transmitting antennae)
• When connecting loads beware of the maximum current for each relay and connector
• Use cable ends suitable for the corresponding connectors. After tightening the screws of connectors, slightly tug the cables to check their tightness
• Use appropriate data communication cables. Refer to the Installation Guide “MCX hardware network specification” for the kind of cable to be used and setup recommendations
• Reduce the path of the probe and digital input cables as much as possible, and avoid spiral paths enclosing power devices. Separate from inductive loads and power cables to avoid possible electromagnetic noises
• Avoid touching or nearly touching the electronic components fitted on the board to avoid electrostatic discharges
• The product is not suitable to be exposed directly to the Internet

DISCLAIMER: Professional Use Only

• This product is not subject to the UK PSTI regulation, as it is for supply to and use only by professionals with the necessary expertise and qualifications.
• Any misuse or improper handling may result in unintended consequences.
• By purchasing or using this product, you acknowledge and accept the professional-use-only nature of its application.
• Danfoss does not assume any liability for damages, injuries, or adverse consequences (“damage”) resulting from the incorrect or improper use of the product and you agree to indemnify Danfoss for any such damage resulting from your incorrect or improper use of the product.

Technical specifications

Power supply

• 21 – 265 V AC, 50/60 Hz.
• Maximum power consumption: 15 W.
• Insulation between the power supply and the extra-low voltage: reinforced
• 40 – 230 V DC

to analog inputs while the unit is not powered
 | Open circuit HW diagnostics available for all analog inputs
 | NTC| 16 (MCX20B2)| AI1 to AI16 on MCX20B2
 | 0 / 1 V| 10 (MCX15B2)| AI1 to AI10 on MCX15B2
 | 0 / 5 V|  | NTC, default 10 kO at 25 °C, Beta 3435
 | 0 / 10 V|  | 0/xV type: impedance is greater than 1 MO
 | PT1000|  |
 | ON/OFF| 10 (MCX20B2)| AI1 to AI6, AI11 to AI14 on MCX20B2
 | 0 / 20 mA| 6 (MCX15B2)| AI1 to AI6 on MCX15B2
 | 4 / 20 mA|  | 100 Os as measuring resistance for current measurements.
 |  |  | The inputs can be used to sense voltage-free contacts with contact
 |  |  | cleaning current 10 mA
 | Auxiliary Supplies|  | 15 V+ and 5 V+
 |  | 5 V+ max: 200 mA (total on all outputs)
 |  | 15 V+ max: 200 mA (total on all outputs)
 |  | All power outputs are protected against short circuit and have an
 |  | automatic recovery from an overload condition.
Digital|  |  | Total number: 22
inputs| Digital Input type selectable via software between 24 V AC or voltage-free
 | Voltage-free contacts or 24 V AC| 18| DI5 to DI22

As the inputs are not isolated, caution has to be used when applying 24 V AC: the same polarity of the supply MUST always be used on the COM/GND connection.

Counting function with a max frequency of 16.6 Hz (30 ms minimum pulse time)

 | 24 V opto-insulated| 4| DI1, DI2, DI3, DI4

Inputs opto isolated, 24 V AC 50/60 Hz or 24 V DC Rated current: 5 mA @24 V AC

 | 230 V opto-insulated| 4| DIH1, DIH2, DIH3, DIH4

Inputs opto isolated, 86 – 265 V AC / 50/60 Hz Reinforced isolation

Rated current: 2,5 mA @ 265 V AC

 |  |  | Note: when the 230 V AC DH1 input is used, the corresponding 24 V DI1 input is not available anymore; the same for the couple of inputs DIH2 and DI2, DIH3 and DI3, DIH4 and DI4
Analog outputs|  |  | Total number: 6
0 / 10 V| 6| AO1, AO2, AO3, AO4, AO5, AO6

Analog Outputs 0/10 V, galvanically isolated, minimum load 1K O (10 mA)

for each output

PWM-PPM| 2| AO5, AO6

Asynchronous PWM

Voltage output: max VLO= 0.6 V, min VHI= 6.5 V Frequency range 15Hz…1kHz

Synchronous PWM and PPM

Voltage output: max VLO= 0.6 V, min VHI= 6.5 V

Frequency: Mains frequency x2

Digital output| Relay| 20 (MCX20B2)

15 (MCX15B2)

| Concerning the insulation distance there are three groups of relays:

•    group 1: relays 1 to 8

•    group 2: relays 9 to 13

•    group 3: relays 14 to 20

Insulation between relays of the same group: functional Insulation between relays of different groups: reinforced

Insulation between relays and the extra-low voltage parts: reinforced Total current load limit: 65 A

C1-NO1 to C13-NO13, C16-NO16 to C20-NO20 on MCX20B2 C1-NO1 to C13-NO13 on MCX15B2

Normally open contact relays 5 A Characteristics of each relay:

–  5 A 250 V AC for resistive loads – 100,000 cycles

–  3 A 250 V AC for inductive loads – 100,000 cycles with cos(phi) = 0.4

– UL: 3 A resistive, 250 V AC, 100,000 cycles; 1/8 hp, 125/250 V AC, 30,000 cycles; C300 pilot duty, 125/250 V AC, 30,000 cycles

C14-NO14-NC14, C15-NO15-NC15

Changeover contact relays 16 A Characteristics of each relay:

–  7 A 250 V AC for resistive loads – 100,000 cycles

–  3.5 A 250 V AC for inductive loads – 230,000 cycles with cos(phi) = 0.4

–  UL: NO contact: 6 A resistive, 240 V AC, 30.000 cycles; 1/2 hp, 240 V AC, 30.000 cycles; 470 VA pilot duty, 240 V AC, 30.000 cycles. NC contact: 6 A resistive, 6.000 cycles

C3 NO3 to C6 NO6

Optionally they can be solid state relays Characteristics of each relay:

15-280 Vrms, 0.5 A

UL: 0.5 A resistive, 240 V AC, 30,000 cycles

---|---|---|---

Communication interface

bus

Frame format according to CAN 2.0B specification Transceiver not isolated (power supply has

reinforced isolation)

USB device| Prepared for future use| USB-DEV| Plug: Type Mini B
USB host| For connection to Flash drive for application software update, data logging and service| USB-H| Plug: Type A
RS485-1

RS485-2 (MCX20B2 only)

| Communication bus to BMS (e.g. Modbus slave), service tools, smart devices (e.g. Modbus master) RS485-1 can be polarized as master from the application| RS485-1 RS485-2| The physical layer according to EIA 485 Ref3 Provides 500 V peak transient galvanic isolation
Ethernet| For web server functionality, integration (e.g. Modbus TCP) NOTICE! Do not route cables outside of buildings.

Connect only to IT equipment compliant with EN 60950 or EN 62368 (Information technology equipment. Safety. General

requirements)

| ETHERNET| Interface type: 10 BASE-T and 100 BASE-TX, IEEE 802.3.

MDI-X (Automatic medium-dependent interface crossover)

Wire lengths

Interface| Max wire length (m)| Max. baudrate (bps)| Min. wire size
---|---|---|---
Ethernet| 100| 10/100 M|
CANbus| 1000| 50 K| AWG18
 | 500| 125 K| AWG22
 | 250| 250 K| AWG24
 | 80| 500 K| AWG26
 | 30| 1 M| AWG26
RS485| 1000| 125 K| AWG22
Signal wiring| 30|  |

Connection diagram

TOP BOARD

BOTTOM BOARD

Connection

Top Board
Digital input 1 connector| 3 way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital output 14-15 connector| 6-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital output 16-20 connector (MCX20B2)| 10-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Analog input 11-14 connector (MCX20B2)| 7-way screw plug-in connector type| • pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Analog input 15-16 connector (MCX20B2)| 4-way screw plug-in connector type| • pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital input 2 connector| 3 way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital input 3 connector| 3 way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital input 4 connector| 3-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital input 5-8 connector| 5-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital input 9-13 connector| 6-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital input 14-17 connector| 5-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital input 18-22 connector| 6-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Bottom Board
Digital output 1-5 connector| 10-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital output 6-8 connector| 6-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Ethernet connector| 8 / 8 way RJ 45 plug type|
USB host connector| USB Type A|
Analog input 1-6 connector| 11-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Analog input 7-10 connector| 6-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Power supply connector| 2-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Digital output 9-13 connector| 10-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

Analog output 1-6 connector| 8-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

RS485 -2 connector| 3-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

RS485-1connector| 3-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

CAN connector| 4-way screw plug-in connector type| •    pitch 5 mm

•    section cable 0.2 – 2.5 mm²

CAN-RJ connector| 6/6 way telephone RJ12 plug type|
USB DEV connector| USB Mini B|

Dimensions

User interface

LCD Display

• display mode: STN blue transmissive
• back-light: white LED back-light adjustable via software
• display format: 128 x 64 dots
• active visible area: 58 x 29 mm
• contrast: adjustable via software

Keyboard

• number of keys: 6
• keys function is settled by the application software

Display settings adjustment

• The setting of the LCD like contrast and brightness might need to be adjusted due to external ambient factors.
• Press and release simultaneously the Enter and X keys after power ON to access the BIOS menu and select the DISPLAY menu.
• Use the UP and DOWN arrow keys to adjust the contrast or the brightness of the display at the desired level.

Product part numbers

Note: single pack codes (S) include standard kit connectors, industrial pack codes (I) don’t include standard kit connectors

Accessories part numbers

Replacement of MCX15B-20B with MCX15B2-20B2 through wiring kit

• You can replace MCX15/20B with an equivalent model of MCX15/20B2. The same application software runs on both versions without any change to the universal power supply (24 V AC – 110 V AC – 230 VAC) of MCX15/20B2 facilitates the selection of the equivalent model.

But there are the following differences that must be taken into consideration:

• The pinout is slightly different for some of the Input/Output (see below the suggested connection diagram)
• The NC (Normally Closed) signals for relay DO10, DO11, DO12 and DO13 are not available in MCX15/20B2. But they are available for DO14 (as in MCX15B) (and for DO15 as in MCX15/20B). An external relay must be used if these signals are needed.
• Alternatively, the application can be changed to take advantage of the additional NC14 signal of MCX20B2.
• The Analogue Outputs (AO) in MCX15/20B2 are internally powered, therefore you must not connect the L1 signal
• 24 V DC power supply is not supported by MCX15/20B2 (40 – 230 V DC)
• The Digital Inputs are both contact-free and 24 V sensing in MCX15/20B2, but the DI common signals (DIC) in MCX15/20B2 are internally connected, therefore you must ensure that DIC are connected to the same phase before the replacement.

For facilitating the replacement of MCX15/20B with B2, you can build a wiring kit following these instructions:

Wiring kit specifications:

• Cables:
  • L = 200 mm H05V-K WHITE
  • DO: section = 1 mm²
  • DI: section = 0.5 mm²
  • AO: section = 0.5 mm²
• Connectors:
  • Phoenix FKIC (or equivalent): Wire strip length = 10 mm
  • Phoenix MSTP (or equivalent): End sleeves = PKD 508/PKD 108 (Danfoss P/N: 080G0404, provided with MCX15/20B2 Single Pack)

Connection diagram – from MCX20B to MCX20B2

Wiring kit

Connection diagram – from MCX15B to MCX15B2

1) External Relay connection diagram

• (when the NC10, NC11, NC12, NC13 signals are needed).
• Example for NC13

CONTACT

• Via San Giuseppe 38/G
• 31015 Conegliano
• (TV) Italy
• Tel: +39 0438 336611
• Fax: +39 0438 336699
• info.mcx@danfoss.com.
• www.danfoss.com.
• Danfoss A/S
• Climate Solutions
• danfoss.com
• +45 7488 2222

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