Switches S201, S202, And S801; Serial Communication; Final Set-Up And Test - Danfoss VLT AutomationDrive FC 302 Instruction Manual

Installation

3.4.22 Switches S201, S202, and S801

Use switches S201 (A53) and S202 (A54) to select a current
(0–20 mA) or a voltage (-10 V to 10 V) configuration of the
3 3
analog input terminals 53 and 54 respectively.
Switch S801 (BUS TER.) can be used to enable termination
on the RS-485 port (terminals 68 and 69).
See Figure 3.26.
Default setting:
S201 (A53) = OFF (voltage input)
S202 (A54) = OFF (voltage input)
S801 (Bus termination) = OFF
NOTICE!
When changing the function of S201, S202 or S801 do
not use force for the switch over. Remove the LCP cradle
when operating the switches. The switches must not be
operated while the adjustable frequency drive is
powered.
Figure 3.30 Remove the LCP Cradle to Access Switches

3.4.23 Serial Communication

RS-485 is a 2-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
NOTICE!
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.
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Instruction Manual
Terminate each segment at both ends using either the
termination switch (S801) of the adjustable frequency
drives or a biased termination resistor network. Always use
shielded twisted pair (STP) cable for bus cabling, and
always follow good common installation practice.
Low-impedance ground connection of the shield at every
node is important, including at high frequencies. Thus,
connect a large surface of the shield to ground, for
example, with a cable clamp or a conductive cable
connector. It may be necessary to apply potential-
equalizing cables to maintain the same ground potential
throughout the network - particularly in installations with
long cables.
To prevent impedance mismatch, always use the same
type of cable throughout the entire network. When
connecting a motor to the adjustable frequency drives,
always use shielded motor cable.
Cable
Impedance
Cable length

3.5 Final Set-up and Test

Before operating the adjustable frequency drive, perform a
final test of the installation:
1.
2.
3.
4.
5.
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
Shielded twisted pair (STP)
120 Ω
Max. 4000 ft [1200 m] (including drop lines)
Max. 1,650 ft [500 m] station-to-station
Table 3.13 Cable Recommendations
1. Locate the motor nameplate to find out whether
the motor is star (Y) or delta connected (Δ).
2. Enter the motor nameplate data in the parameter
list. Access the list by pressing the [Quick Menu]
key and selecting Q2 Quick Set-up. See Table 3.14.
Motor Power [kW]
or Motor Power [HP]
Motor Voltage
Motor Frequency
Motor Current
Motor Nominal Speed
Table 3.14 Quick Set-up Parameters
1-20 Motor Power [kW]
1-21 Motor Power [HP]
parameter 1-22 Motor
Voltage
1-23 Motor Frequency
parameter 1-24 Motor
Current
parameter 1-25 Motor
Nominal Speed
MG37A222