Danfoss VLT AutomationDrive FC 302 Operating Manual page 45

Electrical Installation
5.8.6 Configuring RS485 Serial
Communication
RS485 is a 2-wire bus interface compatible with multi-drop
network topology, and it contains the following features:
•
Either Danfoss FC or Modbus RTU communication
protocol, which are internal to the drive, can be
used.
•
Functions can be programmed remotely using
the protocol software and RS485 connection or in
parameter group 8-** Communications and
Options.
•
Selecting a specific communication protocol
changes various default parameter settings to
match the specifications of the protocol, making
more protocol-specific parameters available.
•
Option cards for the drive are available to provide
more communication protocols. See the option
card documentation for installation and operation
instructions.
•
A switch (BUS TER) is provided on the control
card for bus termination resistance. See
Illustration 5.23.
For basic serial communication set-up, perform the
following steps:
1. Connect RS485 serial communication wiring to
terminals (+)68 and (-)69.
1a Use shielded serial communication cable
(recommended).
1b See chapter 5.6 Connecting to Ground for
proper grounding.
2. Select the following parameter settings:
2a Protocol type in parameter 8-30 Protocol.
2b Drive address in parameter 8-31 Address.
2c Baud rate in parameter 8-32 Baud Rate.
61
68
69
Illustration 5.22 Serial Communication Wiring Diagram
MG38A202
Operating Guide
+
RS485
Danfoss A/S © 04/2018 All rights reserved.
5.8.7 Wiring Safe Torque Off (STO)
The Safe Torque Off (STO) function is a component in a
safety control system. STO prevents the unit from
generating the voltage required to rotate the motor.
To run STO, more wiring for the drive is required. Refer to
Safe Torque Off Operating Guide for further information.
5.8.8 Wiring the Space Heater
The space heater is an option used to prevent conden-
sation from forming inside the enclosure when the unit is
turned off. It is designed to be field wired and controlled
by an HVAC management system.
Specifications
•
Nominal voltage: 100–240
•
Wire size: 12–24 AWG
5.8.9 Wiring the Auxiliary Contacts to the
Disconnect
The disconnect is an option that is installed at the factory.
The auxiliary contacts, which are signal accessories used
with the disconnect, are not installed at the factory to
allow more flexibility during installation. The contacts snap
into place without the need for tools.
Contacts must be installed in specific locations on the
disconnect depending upon their functions. Refer to the
datasheet included in the accessory bag that comes with
the drive.
Specifications
•
U /[V]: 690
i
•
U /[kV]: 4
imp
•
Pollution degree: 3
•
I /[A]: 16
th
•
Cable size: 1...2x0.75...2.5 mm
•
Maximum fuse: 16 A/gG
•
NEMA: A600, R300, wire size: 18–14 AWG, 1(2)
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