Danfoss MCX15B2 Installation Manual Download Page 4

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4 | AN320819413085en-000401

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

Interface

Use

Connector label

Technical data

CANbus

Fieldbus for connection to user
interfaces, MCX controllers, service
tools etc.

CAN
CAN-RJ

Physical layer according to ISO 11898-2 High
Speed CAN 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,
datalogging 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

Physical layer according to EIA 485 Ref3
Provide 500 V peak transient galvanic isolation

Ethernet

For web server functionality,
integration (e.g. Modbus TCP)
NOTICE! Do not route cable 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)

Communication interface

Wire lengths

Interface

Max wire length (m)

Max. baudrate (bps)

Min. wire size

Ethernet

100

10/100 M

CANbus