Wiring To Control Terminals; Using Screened Control Cables - Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual

Installation
Terminal Description
Digital Inputs/Outputs
Terminal Parameter
68 (+) 8-3
69 (-) 8-3
01, 02, 03 5-40 [0] [0] Alarm
04, 05, 06 5-40 [1] [0] Running
Table 2.4 Terminal Description

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 2.15.
Illustration 2.15 Unplugging Control Terminals
1. Open the contact by inserting a small screwdriver
into the slot above or below the contact, as
shown in Illustration 2.16.
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.
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®
VLT AQUA Drive
Operating Instructions
Default
Setting Description
RS-485 Interface. A
control card switch is
provided for
termination resistance.
Relays
Form C relay output.
Usable for AC or DC
voltage and resistive
or inductive loads.
®
MG20M902 - VLT is a registered Danfoss trademark
1
Illustration 2.16 Connecting Control Wiring

2.4.5.4 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.
PLC
PE
Illustration 2.17 Screening Clamps at Both Ends
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 2.18 Connection with a 100 nF Capacitor
Avoid EMC noise on serial communication
To eliminate low-frequency noise between frequency
converters, connect one end of the screen to terminal 61.
This terminal is connected to ground via an internal RC
link. Use twisted-pair cables to reduce interference
between conductors.
FC
- 69
+68
61 (PE)
Illustration 2.19 Twisted-pair Cables
2
FC
PE
FC
PE
FC
PE
21
2 2