position. Seen from the top of the actuator, the outgoing shaft moves in a
counter-clockwise (CCW) direction from the CLOSED position to the OPEN
position (see Figure 38: Position scale on page 46.
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 maximum operating temperature of the internal
electronics. This may happen if the environmental temperature is higher
than the maximum 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 maximum 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
maximum 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 have disappeared.
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