Safe Torque Off (Sto); Switches S201, S202, And S801; Serial Communication; F-Frame Options - Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual

Electrical Installation

4.9.4 Safe Torque Off (STO)

To run Safe Torque Off, additional wiring for the frequency
converter is required. Refer to VLT
Safe Torque Off Operating Instructions for further
information.

4.9.5 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
analog input terminals 53 and 54.
Switch S801 (BUS TER.) can be used to enable termination
on the RS-485 port (terminals 68 and 69).
See Illustration 4.13.
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 with power on the frequency converter.
Illustration 4.18 Remove the LCP Cradle to Access Switches
MG21B202
Operating Instructions
®
Frequency Converters
Danfoss A/S © Rev. 2014-01-22 All rights reserved.

4.9.6 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 networks.
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.
Terminate each segment at both ends, using either the
termination switch (S801) of the frequency converters 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 ground connection of the screen at every
node is important, including at high frequencies. Thus,
connect a large surface of the screen to 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 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 frequency converters, always
use screened motor cable.
Cable Screened twisted pair (STP)
120 Ω
Impedance
Cable length Max. 1200 (including drop lines)
[m] Max. 500 station-to-station
Table 4.11 Cable Recommendations

4.9.7 F-frame Options

Space heaters and thermostat
There are space heaters mounted on the cabinet interior of
F-frame frequency converters. These heaters are controlled
by an automatic thermostat and help control humidity
inside the enclosure. The thermostat default settings turn
on the heaters at 10 °C (50 °F) and turn them off at 15.6
°C (60 °F).
Cabinet light with power outlet
A light mounted on the cabinet interior of F-frame
frequency converters increases visibility during servicing
and maintenance. The housing includes a power outlet for
temporarily powering tools or other devices, available in 2
voltages:
•
230 V, 50 Hz, 2.5 A, CE/ENEC
•
120 V, 60 Hz, 5 A, UL/cUL
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