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Switches 1-4
The dipswitch is located on the control card. It is used
for serial communication and external DC supply.
The switching position shown is the factory setting.
Switch 1 has no function.
Switches 2 and 3 are used for terminating an RS-485
interface to the serial communication bus
NB!:
When the frequency converter is the first or
last device on the serial communication bus,
switches 2 and 3 must be ON in that designated
VLT. Any other VLTs on the serial communication bus
must have switches 2 and 3 set to OFF.
NB!:
Please note that when Switch 4 is in position
"OFF," the external 24 V DC supply is galvanically
isolated from the frequency converter.
Bus connection
The serial bus connection in accordance with the RS
485 (2-conductor) norm is connected to terminals
68/69 of the frequency converter (signals P and N).
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.
MG.70.A1.02 - VLT is a registered Danfoss trademark
VLT® 7000 Booster
In order to avoid potential equalizing currents in the
screen, the cable screen can be earthed via terminal
61, which is connected to the frame via an RC-link.
39
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