Commissioning And Operation - Distech Controls VA-180GN Series Hardware Installation Manual

Manual Override
Automatic Mode:
When the motor drives the manual adjuster turns. In Automatic Mode,
the manual adjuster is used for indication of travel. If the manual
adjuster is held firm in this mode, there is no transmission of power to
the gear train.
Figure 20.
Manual operation
When pushing the manual adjuster down (1), it engages and the
actuator can be manually operated.
When turning the manual adjuster in a clockwise/counterclockwise
direction (2), the actuator's stem extends/retracts. See Figure 21.
An overload protection prevents damage to the manual adjuster.
Figure 21.
Setting the position
Upon actuation and locking the slide switch (see Figure 22), the
manual adjuster remains engaged.
When in this mode, do not turn the manual adjuster.
Figure 22.
Disengaging the setting
When resetting the slide switch (see Figure 23), the manual adjuster
returns to Automatic Mode.
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Figure 23.
Automatic Operation
The actuator will return to automatic operation when the manual
adjuster is released.
Signal Priorities for VA-180GNX024P
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 "Y",
1
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
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.

Commissioning and Operation

These next sections cover the function check (mechanical and
electrical) and calibration.
Mechanical Check
Prior to making the function check, ensure that:
-
Actuator is mechanically connected to a 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 valve.
-
Actuator is in Automatic Operation mode.
-
Actuator and, if required, accessories are correctly fitted and
connected.
-
Power is applied.
"Z" (forced control).
Z
Y
Actuator Response
Actuator's stem extends
Actuator's stem retracts