Troubleshooting - Distech Controls VA-180GN Series Hardware Installation Manual

Table 1. LED Indication and Status.
LED Indication Operating state
On Automatic mode
Calibration
Green
Blinking
In manual mode
On Calibration error
Red Detection of
Blinking
foreign object
No power or
Off Off
electronics faulty
If the actuator does not detect the second end position within an
appropriate stroke range (max. 25 mm), the first end stop will be
adopted and the actuator operates with a working range of 20 mm.
Normally Closed Valve
VA-180GNX024P:
Increasing the control signal extends the actuator (0 to 1): Valve
opens.
Decreasing the control signal retracts the actuator (1 to 0): Valve
closes.
VA-180GNX024F:
Y1 control signal extends the actuator (0 to 1): Valve opens.
Y2 control signal retracts the actuator (1 to 0): Valve closes.
Normally Open Valve
VA-180GNX024P:
Increasing the control signal extends the actuator (0 to 1): Valve
closes.
Decreasing the control signal retracts the actuator (1 to 0): Valve
opens.
VA-180GNX024F:
Y1 control signal extends the actuator (0 to 1): Valve closes.
Y2 control signal retracts the actuator (1 to 0): Valve opens.
Three-Way Valve
VA-180GNX024P:
Increasing the control signal extends the actuator (0 to 1): Valve opens
between Ports A and AB (through port).
Decreasing the control signal retracts the actuator (1 to 0): Valve
opens between Ports B and AB (bypass port).
VA-180GNX024F:
Y1 control signal extends the actuator (0 to 1): Valve opens between
Ports A and AB (through port).
Y2 control signal retracts the actuator (1 to 0): Valve opens between
Ports B and AB (bypass port)

Troubleshooting

-
Check that the wires are connected correctly and attached
securely.
-
Check for adequate power supply.
-
If the actuator moves erratically in very small steps, check that it
is receiving adequate power.
8/10
Remarks,
troubleshooting
Normal operation
Wait until calibration is
finished
(then green or red light)
Manual adjuster in
MAN position
Start calibration again
Check valve / actuator
Check operating
voltage
VA-180GNX024P Function Check
Perform the function check for modulating actuators after calibration
with a point test according to the following table:
Table 2. Modulating Function Check.
Connection
Actuator Response
Terminals
6V Actuator's stem

Y
extends (60%)
13.6 mA
5V Actuator's stem

Y
retracts (50%)
12 mA
Actuator's stem
"Z" connected to "G"
extends to 100%
"Z" connected to Actuator's stem
"G0"
retracts to 0%
After successful completion of the function check, the actuator is ready
for normal operation.
VA-180GNX024F Function Check
Perform the function check for three-position actuators according to the
following table:
Table 3. Three-Position (Floating) Function Check.
Connection Terminals
Voltage at Y1
Voltage at Y2
No voltage at Y1 and Y2
After successful completion of the function check, the actuator is ready
for normal operation.
Position
Feedback (U)
6V
5V
10V
0V
Actuator Response
Actuator's stem extends
Actuator's stem retracts
Actuator's stem maintains the
position