Serial Communication - Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual

Installation
[Hz], and only if the frequency converter carries
out a stop command.
If the frequency converter is in alarm mode or in an over-
voltage situation, the mechanical brake immediately cuts
in.
In the vertical movement, the key point is that the load
must be held, stopped, controlled (raised, lowered) in a
safe mode during the entire operation. Because the
frequency converter is not a safety device, the crane/lift
designer (OEM) must decide on the type and number of
safety devices (e.g. speed switch, emergency brakes etc.) to
be used, in order to be able to stop the load in case of
emergency or malfunction of the system, according to
relevant national crane/lift regulations.
L1 L2 L3
Drive
U V W
Mechanical
Brake
Shaft
Motor
Illustration 2.21 Connecting the Mechanical Brake to the
Frequency Converter

2.4.6 Serial Communication

Connect RS-485 serial communication wiring to terminals
(+)68 and (-)69.
•
Screened serial communication cable is
recommended
•
See 2.4.2 Earth (Grounding) Requirements for
proper grounding
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®
VLT AQUA Drive
Operating Instructions
Output
relay
02 01
Command Circuit
220Vac
Output
A1
Frewheeling
Contactor
diode
Input
A2
Brake Power Circuit
380Vac
®
MG20M902 - VLT is a registered Danfoss trademark
61
68
69
Illustration 2.22 Serial Communication Wiring Diagram
For basic serial communication set up, select the following
1. Protocol type in 8-30 Protocol.
2. Frequency converter address in 8-31 Address.
3. Baud rate in 8-32 Baud Rate.
•
Four communication protocols are internal to the
frequency converter. Follow motor manufacturer
wiring requirements.
Danfoss FC
Modbus RTU
Johnson Controls N2
•
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 for the frequency converter are
available to provide additional communication
protocols. See the option-card documentation for
installation and operation instructions
+
RS-485
®
23
2 2