Wiring To Control Terminals; Using Screened Control Cables - Danfoss VLT FC 103 Operating Instructions Manual

Installation
Terminal Parameter
61 -
68 (+) 8-3*
69 (-) 8-3*
01, 02, 03 5-40
04, 05, 06 5-40
Table 2.5 Terminal Description

2.4.6.2 Wiring to Control Terminals

Control terminal connectors can be unplugged from the
frequency converter for ease of installation, as shown in
Illustration 2.28.
Illustration 2.28 Unplugging Control Terminals
1. Open the contact by inserting a small screwdriver
into the slot above or below the contact, as
shown in Illustration 2.29.
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 Set-Up Examples for typical control wiring
connections.
inverter.ru (812) 702-47-50
VLT Refrigeration Drive FC 103 1.1-90 kW Operating Instructions
D D igital Inputs/Outputs
Default Description
Setting
Integrated RC-Filter
for cable screen. ONLY
for connecting the
screen when experi-
encing EMC problems.
RS-485 Interface. A
control card switch is
provided for
termination resistance.
Relays
[2] Drive ready Form C relay output.
Usable for AC or DC
[5] Running
voltage and resistive
or inductive loads.
MG16E202 - VLT® is a registered Danfoss trademark
1
Illustration 2.29 Connecting Control Wiring

2.4.6.3 Using Screened Control Cables

Correct screening
The preferred method in most cases is to secure control
and serial communication cables with screening clamps
provided at both ends to ensure best possible high
frequency cable contact.
If the earth potential between the frequency converter and
the PLC is different, electric noise may occur that will
disturb the entire system. Solve this problem by fitting an
equalizing cable next to the control cable. Minimum cable
2
cross section: 16 mm .
PLC
PE
PE
2
Illustration 2.30 Correct Screening
1 2
Min. 16 mm
2 Equalizing cable
Table 2.6 Legend to Illustration 2.30
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).
PLC
PE
100nF
Illustration 2.31 50/60 Hz Ground Loops
2
FC
PE <10 mm
PE
1
FC
PE <10 mm
21
2 2