Wiring To Control Terminals; Control Terminal Functions; Serial Communication - Danfoss VLT FC 103 Operating Instructions Manual

Installation

2.5.5 Wiring to Control Terminals

Terminal plugs can be removed for easy access.
2 2
I I llustration 2.20 Removal of Control Terminals

2.5.6 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 5 Programming
and 6 Application Examples for terminals and
associated parameters.
•
It is important to confirm that the control
terminal is programmed for the correct function.
See 5 Programming for details on accessing
parameters and programming.
•
The default terminal programming is intended to
initiate frequency converter functioning in a
typical operational mode
2.5.6.1 Terminal 53 and 54 Switches
•
Analog input terminals 53 and 54 can select
either voltage (0 to 10 V) or current (0/4-20 mA)
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 Illustration 2.21).
NOTE
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
22
inverter.ru (812) 702-47-50
VLT Refrigeration Drive Operating Instructions
•
Illustration 2.21 Location of Terminals 53 and 54 Switches and
Bus Termination Switch

2.6 Serial Communication

RS-485 is a two-wire bus interface compatible with multi-
drop network topology, i.e. nodes can be connected as a
bus, or via drop cables from a common trunk line. A total
of 32 nodes can be connected to one network segment.
Repeaters divide network segments. Each repeater
functions as a node within the segment in which it is
installed. Each node connected within a given network
must have a unique node address across all segments.
Terminate each segment at both ends, using either the
termination switch (S801) of the frequency converter or a
biased termination resistor network. Always use screened
twisted pair (STP) cable for bus cabling, and always follow
good common installation practice.
Low-impedance earth (ground) connection of the screen at
every node is important, including at high frequencies.
Thus, connect a large surface of the screen to earth
(ground), for example with a cable clamp or a conductive
cable gland. It may be necessary to apply potential-
equalizing cables to maintain the same earth (ground)
potential throughout the network. Particularly in instal-
lations with long cables.
To prevent impedance mismatch, always use the same
type of cable throughout the entire network. When
MG16J102 - VLT is a registered Danfoss trademark
Terminal 54 default is for a feedback signal in
closed loop set in 16-63 Terminal 54 Switch Setting