5
vacon • 39
Control unit
5.3.7
Selection of terminal functions with dip switches
The VACON
®
20 X drive embodies four so-called
switches
that allow for two functional selec-
tions each. The shadowed terminals in Table 13 can be functionally modified with the dip
switches.
The switches have two positions: 0 and 1. See Figure 26 to locate the switches and make ap-
propriate selections for your requirements.
Figure 26. Dip switches on the control unit.
5.3.7.1
Switch SW1
The digital inputs (terminals 8-10 and 14-16) on the standard I/O board can be
isolated
from
ground by setting the
dip switch SW1
to position ‘1’. See Figure 26. Locate the switch and set
it in the desired position. The switch in the position “0” means that the common of digital input
have been connected to the ground.The default position is “0”.
5.3.7.2
Switches SW2 and SW3
Analogue inputs can be used as either current inputs or voltage inputs. The signal type is se-
lected with two switches on the control board.
The switch SW2 is related to analogue input AI1. In position “1” the analogue input AI1 works
in voltage mode. In position “0” the analogue input works in current mode. The default position
for SW2 is “1”.
The voltage range is 0...10V and the current is 0/4.....20 mA.
The switch SW3 is related to analogue input AI2. In the position “1” the analogue input AI2
works in voltage mode. In the position “0” the analogue input works in current mode. The de-
fault position for SW3 is “0”.
The voltage range is 0...10V and the current is 0/4.....20 mA.
5.3.7.3
Switch SW4
The switch SW4 is related to the RS485 connection. It’s used for bus termination. The bus ter-
mination must be set to the first and to the last device on the network. The switch SW4 in po-
sition “0” means that termination resistance is connected and the termination of the bus has
been set. If the Vacon 20 X is the last device on the net, this switch must be set to “0” position.
The default position for SW4 is “1”.
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