Control unit
vacon • 55
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
5
5.4.2
Preparation for use through RS485
1
Strip about 15 mm of the RS485 cable (see specification on Table 25) and cut off
the grey cable shield. Remember to do this for both bus cables (except for the
last device).
Leave no more than 10 mm of the cable outside the terminal block and strip the
cables at about 5 mm to fit in the terminals. See picture below.
Also strip the cable now at such a distance from the terminal that you can fix it to
the enclosure with the grounding clamp. Strip the cable at a maximum length of
15 mm.
Do not strip the aluminium cable shield!
2
Then connect the cable to its appropriate terminals on VACON
®
20 X AC drive
standard terminal block, terminals
A and B
(A = negative, B = positive).
3
Using the cable clamp included in the supply of the drive, ground the shield of
the RS485 cable to the enclosure of the AC drive.
4
If VACON
®
20 X drive is the last device on the bus
,
the bus termination must be set. Locate the switches
to the right of the control terminals (see Figure 38)
and turn the SW4 switch to position “0”. Biasing is
built in the termination resistor.
5
NOTE:
When planning the cable runs, remember to keep the distance between
the fieldbus cable and the motor cable at a
minimum of 30 cm
.
6
The bus termination must be set for the first and the last device of the fieldbus
line. We recommend that the first device terminated is the Master device.
10
5
