Control Terminal Functions; Jumper Terminals 12 And; Terminal 53 And 54 Switches - Danfoss VLT AutomationDrive FC 303 Instruction Manual

Installation
an equalizing cable next to the control cable. Minimum
cable cross-section: 16 mm
2 2
50/60Hz 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 100nF capacitor (keeping leads short).
Avoid EMC noise on serial communication
This terminal is grounded via an internal RC link. Use
twisted-pair cables to reduce interference between
conductors. The recommended method is shown below:
Alternatively, the connection to terminal 61 can be
omitted:

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. SeeTable 2.3 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.
2-10
VLT
Manual
2
.
PLC FC
PE PE
PE PE
Min. 16 mm²
- Equalizing cable
PLC FC
PE
PE
100nF
FC FC
69 69
68 68
61 61
PE PE
PE PE
Min. 16 mm²
- Equalizing cable
FC FC
69 68
69
68
PE PE
PE PE
Min. 16 mm²
- Equalizing cable
MG.33.AI.22 - VLT
® AutomationDrive Instruction
•
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 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 an 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 COAST, 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 (-10–10V) or current (0/4–20mA)
input signals
•
Remove power to the Adjustable frequency drive
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 Figure 2.14). 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.
•
Terminal 53 default is for a speed reference signal
in open-loop set in 16-61 Terminal 53 Switch
Setting
•
Terminal 54 default is for a feedback signal in
closed-loop set in 16-63 Terminal 54 Switch Setting
®
is a registered Danfoss trademark