Wiring To Control Terminals; Using Screened Control Cables - Danfoss FC 300 Operating Instructions Manual

Installation
Terminal description
Default
Terminal Parameter setting
55 -
Table 2.4 Terminal Description Digital Inputs/Outputs, Analog Inputs/Outputs
Terminal description
Default
Terminal Parameter setting
Serial communication
61 -
68 (+) 8-3*
69 (-) 8-3*
Relays
[0] No
01, 02, 03 5-40 [0] operation
04, 05, 06 5-40 [1] [0] No
operation
Table 2.5 Terminal Description Serial Communication

2.4.5.3 Wiring to Control Terminals

Control terminal connectors can be unplugged from the
frequency converter for ease of installation, as shown in
Illustration 2.11.
1. Open the contact by inserting a small screwdriver
into the slot above or below the contact, as
shown in Illustration 2.13.
2. Insert the bared control wire into the contact.
3. Remove the screwdriver to fasten the control wire
into the contact.
4. Ensure the contact is firmly established and not
loose. Loose control wiring can be the source of
equipment faults or less than optimal operation.
See 10.1 Power-dependent Specifications for control terminal
wiring sizes.
See 6 Application Examples for typical control wiring
connections.
VLT ® AutomationDrive Operating
Instructions
Description
Common for analog
input
Description
Illustration 2.13 Connecting Control Wiring
Integrated RC-Filter
for cable screen. ONLY
for connecting the

2.4.5.4 Using Screened Control Cables

screen when experi-
encing EMC problems.
Correct screening
RS-485 Interface. A
The preferred method in most cases is to secure control
control card switch is
and serial communication cables with screening clamps
provided for
provided at both ends to ensure best possible high
termination resistance.
frequency cable contact.
If the earth potential between the frequency converter and
Form C relay output.
the PLC is different, electric noise may occur that will
Usable for AC or DC
disturb the entire system. Solve this problem by fitting an
voltage and resistive
equalizing cable next to the control cable. Minimum cable
or inductive loads.
cross section: 16 mm
Illustration 2.14 Correct Screening
Table 2.6 Legend to Illustration 2.14
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).
Illustration 2.15 50/60 Hz Ground Loops
®
MG33AM02 - VLT is a registered Danfoss trademark
1
2
2 .
PLC
PE PE
PE
1
2
1
Min. 16 mm 2
2 Equalizing cable
PLC
PE
100nF PE
FC
PE
FC
17
2 2