1
2
PE
FC
PE
PLC
130BB922.12
PE PE
<10 mm
1
Min. 16 mm
2
2 Equalizing cable
Illustration 3.25 Correct Screening
50/60 Hz ground loops
With very long control cables, ground loops may occur. To
eliminate ground loops, connect one end of the screen-to-
ground with a 100 nF capacitor (keeping leads short).
100nF
FC
PE
PE
PLC
<10 mm
130BB609.12
Illustration 3.26 Avoiding Ground Loops
Avoid EMC noise on serial communication
This terminal is connected to ground via an internal RC
link. Use twisted-pair cables to reduce interference
between conductors. The recommended method is shown
below:
PE
FC
PE
FC
130BB923.12
PE PE
69
68
61
69
68
61
1
2
<10 mm
1
Min. 16 mm
2
2 Equalizing cable
Illustration 3.27 Avoiding EMC Noise
Alternatively, the connection to terminal 61 can be
omitted:
PE
FC
PE
FC
130BB924.12
PE PE
69
69
68
68
1
2
<10 mm
1
Min. 16 mm
2
2 Equalizing cable
Illustration 3.28 Screening without Using Terminal 61
3.5.4 Control Terminal Types
Terminal functions and default settings are summarised in
chapter 3.5.6 Control Terminal Functions.
1
4
2
3
130BA012.12
61
68
69
39
42
50
53
54
55
12
13
18
19
27
29
32
33
20
37
Illustration 3.29 Control Terminal Locations
•
Connector 1 provides:
-
4 programmable digital input terminals
-
2 additional digital terminals
programmable as either input or output
-
24 V DC terminal supply voltage
-
A common wire for optional customer
supplied 24 V DC voltage
•
Connector 2 terminals (+)68 and (-)69 are for an
RS-485 serial communications connection.
•
Connector 3 provides
-
2 analog inputs
-
1 analog output
-
10 V DC supply voltage
-
Common wires for the inputs and
output
•
Connector 4 is a USB port available for use with
the MCT 10 Set-up Software.
•
Also provided are 2 Form C relay outputs which
are located on the power card.
Installation
Operating Instructions
32 Danfoss A/S © Rev. 06/2014 All rights reserved. MG16D302
33
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