problem by fitting an equalizing cable next to the control
cable. Minimum cable cross section: 16 mm
2
.
1
2
PE
FC
PE
PLC
130BB922.12
PE
PE
<10 mm
1
Min. 16 mm
2
2
Equalizing cable
Illustration 3.9 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 3.10 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 3.11 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 3.12 Screening without Using Terminal 61
3.5.4 Control Terminal Types
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 3.13 Control Terminal Locations
•
Connector 1
provides four programmable digital
input terminals, two additional digital terminals
programmable as either input or output, a 24 V
DC terminal supply voltage, and a common for
optional customer supplied 24 V DC voltage
•
Connector 2
terminals (+)68 and (-)69 are for an
RS485 serial communications connection
•
Connector 3
provides 2 analog inputs, one
analog output, 10 V DC supply voltage, and
commons 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 that are
located on the power card
Installation
Installation Guide
MG35Q202
Danfoss A/S © 01/2015 All rights reserved.
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