Function Check And Calibration - Distech Controls VA-045PNX024P Hardware Installation Manual

Disengaging the setting
When the black slide switch is pushed back in, and the manual adjuster is
not pressed down, the manual adjuster returns to Automatic Mode.
Automatic Operation
The actuator will return to automatic operation when the manual adjuster
is released.
Signal Priorities
The actuators are controlled via different interlinked positioning signal
paths (positioning signal "Y", forced control input "Z", or manual override).
The signal paths are assigned the following priorities (1 = highest priority,
3 = lowest priority):
Priority Description
The manual override always has priority 1,
thus overriding all signals active at "Z" or
1
"Y", independent of whether or not power is
applied.
As soon as a valid positioning signal is
active at input "Z", the position is determined
via positioning signal "Z" (forced control).
2
Prerequisite: The manual override is not
used.
The position is determined via positioning
signal "Y". The manual override is not used
3
and on "Z" there is no active signal.

Function Check and Calibration

Mechanical Check
Prior to making the function check, ensure that:

Actuator is mechanically connected to a Pressure Independent
Control Valve.

Actuator is in Manual Operation mode.
The actuator can be operated with the help of the Manual Adjuster.
Manual Adjuster Action
Turning in clockwise direction
Turning in counterclockwise
direction
Ensure that the actuator's and valve's stems are securely
connected in all positions.
If the actuator is forced to travel beyond its end positions,
overload protection responds.
Electrical Check
Prior to making the function check, ensure that:

Actuator is mechanically connected to a VA-599 Series Pressure
Independent Control Valve.

Actuator is in Automatic Operation mode.

Actuator and, if required, accessories are correctly fitted and
connected.

Power is applied.
6/9
Figure 17.
Actuator Response
Actuator's stem extends
Actuator's stem retracts
Calibration
Calibration is required with modulating actuators, and before the function
check. Calibration must be performed manually.
Prior to calibrating, ensure that:

Actuator is properly connected to a valve.

Housing cover is removed.

Power is applied.
If required, calibration can be repeated any number of times.
To initiate the calibration process insert a flat-blade screwdriver into the
calibration slot to short out the two sides of the slot. See Figure 18.
During calibration, the actuator detects the valve's end positions and files
the exact stroke in its internal memory. Calibration takes place in three
phases:
Z

Actuator drives to H
upper end position.

Actuator drives to H
lower end position.
Y

The detected values are stored (3). Then the actuator follows the
applied control signal.
Observe the status indication (LED) during and after calibration. See
Figures Figure 19 and Table 2.
Figure 18. Step 1—Bridge contact.
(1), retracting actuator stem. Detection of
0
(2), extending actuator stem. Detection of
100
Figure 19. Step 2—Check LED.