Valve percent position is a [0%, 100%] value. A value of 0% corresponds to
CLOSED position, while a value of 100% corresponds to an OPEN position. Seen
from the top of the actuator, the outgoing shaft moves in a counter-clock-wise
(CCW) direction from CLOSED position to OPEN position (see Figure 33: Position
scale on page 44.
A position encoder is connected to the outgoing shaft of the actuator and maps
positions from 0° to 359° on the outgoing shaft. For each unit, correct CLOSED
and OPEN positions for the valve must be configured in the firmware of the
actuator for proper functionality.
The position encoder reads out the absolute positional information. This means
that if the outgoing shaft is moved while the actuator is powered off, the correct
position is still shown when the actuator is powered on again.
• Trigger conditions: The alarm is activated when the temperature of the
actuator is near the max operating temperature of the internal electronics.
This may happen if the environmental temperature is higher than the max
rated temperature for the actuator or if the actuator has been run with a
higher duty cycle than specified in section 3.3.
• Reaction from actuator: The voltage to the motor is cut off if the
temperature increases above the max operating temperature of the internal
electronics. The motor can run again when the temperature alarm is inactive.
• Reset conditions: The temperature must decrease well below the max
operating temperature of the internal electronics.
• Trigger conditions: The actuator has been running but has stopped
unexpectedly. This may be caused by too high braking torque on the
outgoing shaft or failure in the motor control and feedback system.
• Reaction from actuator: The actuator stops running.
• Reset conditions: A new position command (OPEN, CLOSE, GOTO, STOP).
The motor can then run again, given that the trigger conditions for the alarm
has disappeared.
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