Danfoss MCX15B2 Installation Manual page 8

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 and 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 lenght = 10 mm
Phoenix MSTP (or equivalent): End sleeves = PKD 508/PKD 108 (Danfoss P/N: 080G0404, provided with MCX15/20B2 Single Pack)
1
8 | AN320819413085en-000401
Phoenix FKIC
Connector
(not provided)
D09-12
11 ways
D013
3 ways
Wiring kit (example)
Connector
provided with
MCX15/20B2
(Single Pack)
1
D09-13
10 ways
1
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