Using Shielded Control Cables; Control Terminal Functions; Jumper Terminals 12 And - Danfoss VLT AQUA Drive FC 202 Instruction Manual

Installation
See 6 Application Set-up Examples for typical control wiring
connections.
1
Figure 2.16 Connecting Control Wiring

2.4.5.4 Using Shielded Control Cables

Correct shielding
The preferred method in most cases is to secure control
and serial communication cables with shielding clamps
provided at both ends to ensure best possible high
frequency cable contact.
PLC
PE
Figure 2.17 Shielding 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 shield-to-
ground with a 100 nF capacitor (keeping leads short).
PLC
PE
100nF
Figure 2.18 Connection with a 100 nF Capacitor
®
VLT AQUA Drive
Instruction Manual
2
FC
PE
FC
PE <10 mm
®
MG20M922 - VLT is a registered Danfoss trademark
Avoid EMC noise on serial communication
To eliminate low-frequency noise between adjustable
frequency drives, connect one end of the shield 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)
Figure 2.19 Twisted-pair Cables

2.4.5.5 Control Terminal Functions

Adjustable frequency drive functions are commanded by
receiving control input signals.
•
Each terminal must be programmed for the
function it will be supporting in the parameters
associated with that terminal. See Table 2.4 for
terminals and associated parameters.
•
It is important to confirm that the control
terminal is programmed for the correct function.
See 4 User Interface for details on accessing
parameters and 5 About Adjustable Frequency
Drive Programming for details on programming.
•
The default terminal programming is intended to
initiate adjustable frequency drive functioning in
a typical operational mode.

2.4.5.6 Jumper Terminals 12 and 27

A jumper wire may be required between terminal 12 (or
13) and terminal 27 for the adjustable frequency drive to
operate when using factory default programming values.
•
Digital input terminal 27 is designed to receive a
24 V DC external interlock command. In many
applications, the user wires an external interlock
device to terminal 27
•
When no interlock device is used, wire a jumper
between control terminal 12 (recommended) or
13 to terminal 27. This provides an internal 24 V
signal on terminal 27.
•
No signal present prevents the unit from
operating.
•
When the status line at the bottom of the LCP
reads AUTO REMOTE COASTING or Alarm 60
External Interlock is displayed, this indicates that
the unit is ready to operate but is missing an
input signal on terminal 27.
FC
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2-11
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