Distech Controls VA-180GN Series Hardware Installation Manual page 4

Wiring
Do not use autotransformers. Use earth ground isolating step-down
Class 2 power supply transformers.
Determine supply transformer rating by summing total VA of all
actuators used. The maximum rating for a Class 2 step-down
transformer is 100 VA.
It is recommended that no more than 10 actuators are powered by one
transformer.
Parallel Control of Actuators
VA-180GNX024F -Three-position actuators must have their own
specific controller.
VA-180GNX024P - Up to 10 actuators can be driven in parallel from a
single controller output with a rating of 1 mA. Modulating actuators
have an input impedance of 100KΩ.
Use either a Phillips head screwdriver or a flat-blade
screwdriver to remove the wiring compartment housing
cover for access to the terminal block and DIP switches.
DIP Switch Setting for VA-180GNX024P
Switch 1: Control Signal
Select between 0 to 10 Vdc or 4 to 20 mA input signal for terminal Y (0
to 10 Vdc default).
Switch 2: Flow Characteristic
Do not change the flow characteristic switch.
Changing the default setting will modify an equal percentage valve to a
linear flow characteristic. When set to default, the flow characteristic is
determined by the valve body.
Set the actuator switches as specified. These switches
do not reverse the action from NO to NC or vice versa.
The valve body assembly determines the complete
assembly action.
Positioning Signal and Flow Characteristic Selection
DIP Switches
Figure 13.
Position Positioning Signal "Y"
OFF 0 to 10 Vdc
DC 4 to 20
ON
mA
4/10
Position Feedback "U"
0 to 10 Vdc
0 to 10 Vdc
Flow Characteristic
log = equal-
percentage
lin = linear
Wiring Diagrams for VA-180GNX024P
Figure 14. Connecting Terminals (VA-180GNX024P).
G0 System Neutral (SN)
G System Potential (SP)
Y Positioning signal for 0 to 10 Vdc/4 to 20 mA
M Measuring neutral
U Position feedback 0 to 10 Vdc
Z Positioning signal forced control
Internal Diagrams
Accessories
A and/or
1x VA-ASC10.51
Auxiliary Switch
Figure 15. Applications.
The wiring diagrams show all possible connections. The application
determines which connections are used. A and B are optional auxiliary
switches.
B
1x VA-ASC10.51
Auxiliary Switch