5
vacon • 52
Control unit
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
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 selections
each. The shadowed terminals in Table 21 can be functionally modified with the dip switches.
The switches have two positions: 0 and 1. See Figure 38 to locate the switches and make appropri-
ate selections for your requirements.
Figure 38. 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 38. 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 selected
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 volt-
age 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 default 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 is used for bus termination. The bus termina-
tion must be set to the first and to the last device on the network. The switch SW4 in position “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 posi-
tion for SW4 is “0”.
