2
1
10 mm
130BA310.10
12 13
18
19
27
29
32
33
Illustration 2.17 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.
PE
FC
PE
PLC
130BB610.11
Illustration 2.18
50/60Hz 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 100nF capacitor (keeping leads short).
100nF
FC
PE
PE
PLC
130BB609.11
Illustration 2.19
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.
- 69
FC
+68
61 (PE)
FC
PE
130BB611.11
Illustration 2.20
2.4.5.5 Control Terminal Functions
Frequency converter 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
for
terminals and associated parameters.
•
It is important to confirm that the control
terminal is programmed for the correct function.
See for details on accessing parameters and for
details on programming.
•
The default terminal programming is intended to
initiate frequency converter 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 frequency converter to operate
when using factory default programming values.
•
Digital input terminal 27 is designed to receive an
24V 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 in internal 24V
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.
•
When factory installed optional equipment is
wired to terminal 27, do not remove that wiring
2.4.5.7 Terminal 53 and 54 Switches
•
Analog input terminals 53 and 54 can select
either voltage (0 to 10V) or current (0/4-20mA)
input signals
•
Remove power to the frequency converter before
changing switch positions
•
Set switches A53 and A54 to select the signal
type. U selects voltage, I selects current.
•
The switches are accessible when the LCP has
been removed (see
). Note that
some option cards available for the unit may
cover these switches and must be removed to
change switch settings. Always remove power to
the unit before removing option cards.
Installation
VLT
®
AQUA Drive
Operating Instructions
18
MG.20.M8.02 - VLT
®
is a registered Danfoss trademark
2
2
