Rs-485 Serial Communication - Danfoss VLT AutomationDrive FC 301 Instruction Manual

Electrical Installation
In hoisting/lowering applications, it is necessary to
control an electro-mechanical brake:
•
Select [32] Mechanical brake control in parameter
group 5-4* Relays for applications with an electro-
mechanical brake.
•
The brake is released when the motor current
exceeds the preset value in 2-20 Release Brake
4 4
Current.
•
The brake is engaged when the output frequency
is less than the frequency set in 2-21 Activate
Brake Speed [RPM] or 2-22 Activate Brake Speed
[Hz], and only if the adjustable frequency drive
carries out a stop command.
If the adjustable frequency drive is in alarm mode or in an
overvoltage situation, the mechanical brake immediately
closes.
The adjustable frequency drive is not a safety device. It is
the responsibility of the system designer to integrate
safety devices according to relevant national crane/lift
regulations.
L1 L2
U V
Motor
Figure 4.11 Connecting the Mechanical Brake to the
Adjustable Frequency Drive
20
Instruction Manual
L3
Drive
Output
relay
W
02 01
Mechanical
Brake
Output
A1
Contactor
Input
Shaft
A2
Brake Power Circuit
380Vac
Danfoss A/S © Rev. 2014-02-10 All rights reserved.

4.8.7 RS-485 Serial Communication

Connect RS-485 serial communication wiring to terminals
(+)68 and (-)69.
•
Use shielded serial communication cable
(recommended)
•
See chapter 4.3 Grounding for proper grounding
Figure 4.12 Serial Communication Wiring Diagram
For basic serial communication set-up, select the following:
1. Protocol type in 8-30 Protocol.
2. Adjustable frequency drive address in
8-31 Address.
3. Baud rate in 8-32 Baud Rate.
Command Circuit
220Vac
•
Two communication protocols are internal to the
adjustable frequency drive.
Frewheeling
diode
•
Functions can be programmed remotely using
the protocol software and RS-485 connection or
in parameter group 8-** Communications and
Options.
•
Selecting a specific communication protocol
changes various default parameter settings to
match that protocol's specifications along with
making additional protocol-specific parameters
available.
•
Option cards which can be installed in the
adjustable frequency drive are available to
provide additional communication protocols. See
the option-card documentation for installation
and instruction manual.
61
+
68
RS-485
69
Danfoss FC
Modbus RTU
MG33AN22