Danfoss VLT 5000 Manuel d'instructions télécharger pdf (Page 45)

Wiring

• Serial Communications

– Need repeater (amplifier) after 31 drives attached together

– Dip switch settings 2 & 3 to OFF except for 2 bus ends

Serial Communications

This diagram shows how the serial communications is wired. Notice that it is an RS-

485 connection, which means that all the positive terminals (68) are wired together and all

the negatives (69) are wired together. These connections must be in a “Daisy Chain”

fashion which only has 2 ends. Star configurations should NOT be used. The address for

each drive is set in parameter 500, from address 1 to 126. The default address is #1. If

more than 31 drives are attached a repeater should be used to amplify the signal.

On the control card just above the serial communications plug, there is a DIP switch,

which is used to enable/disable the EOL (end of line) resistor. If one or 2 drives are attached

together, leave the DIP alone. Once a 3

drive is added, the middle drive must have

switches 2 and 3 turned OFF, down, to remove the EOL resistor. If other drives are added,

all drive that are not on the 2 ends must have DIP switch settings 2 and 3 turned OFF.

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Danfoss VLT 5000 Manuel d'instructions Page 45