VLT® 5000 Crane
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Bus connection RS 485
The serial bus connection is connected to terminals
68/69 of the frequency converter (signals P and N) in
accordance with the RS 485 (2-wire) norm. Signal
P is the positive potential (TX+,RX+), while signal
N is the negative potential (TX-,RX-).
If more than one frequency converter is to be connected
to a given master, use parallel connections.
In order to avoid potential equalizing currents the
circuit driving terminals 68 and 69 are connected to
the VLT chassis ground via a 100
resistor.
Bus termination
The bus must be terminated by a resistor network at
both ends. For this purpose, set switches 2 and 3
on the control card for "ON", see
Switches 1-4
.
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Bus Connection RS 232
The purpose of the RS 232 is to enable communication
between a PC and one VLT. With this communication it
is possible to monitor, programme and control the VLT.
However, it is not possible to use the RS 232
concurrently with the RS 485. When using one
of the buses, the other must be disconnected,
ie. when using eg. the RS 232, the RS 485 plug
must be removed from the board.
Hardware connection of the RS 232:
Pin 1 is connected to pin 6 on the control card,
which results in the PC receiving a "Clear to Send"
when it sends a "Request to Send".
When looking into the RJ-11, pin 1 is the left terminal.
Danfoss offers a cable with an RJ-11 male plug
in both ends and an adaptor between RJ-11 and
Sub-D 9 Pole (for PC connection).
MG.50.N4.02 - VLT is a registered Danfoss trademark
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