User Guide

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14
Specifi cations Parameter Variables Description
Alarms - Fault
A fi xed voltage of 8.5 VDC is present when
Alarm ‘sounds’.
Hunting
Alarm criteria: Actuator is hunting due to unstable control loop.
This fault occurs when the ratio of Active time to Operating time exceeds
20%.
Operating time: Total number of hours connected to power supply Active
time: Total number of hours the actuator is in mechanical motion.
Mechanical Overload Alarm criteria: Actuator is in a position and not responding to the control
input. An alarm will ‘sound’ when an object or circumstance is preventing
the motion of the actuator, damper or valve. The actuator has initiated its
own overload protection after a period of 13 seconds.
Mechanical Travel Alarm criteria: Actuator is adapted to the working angle of a damper or
to the stroke of a valve and is less than 95-degree actuator rotation (eg.
75° adapted angle). An alarm will ‘sound’ when the actuator detects a
mechanical travel difference of 10% above the adapted angle (eg. 82.6°).
Alarm - Maintenance
A fi xed voltage of 5.5 VDC is present when
Alarm ‘sounds’.
Mechanical load limit
(Non-Sprlng Return Only)
Alarm criteria: The torque load of the application has exceeded the
actuator’s torque.
A typical scenario – the torque requirements has increased due to:
• Lack of lubrication
• Increased fl ow
• Improper installation
• Damage
• Dirt and debris build-up
The alarm ‘sounds’ when the specifi ed torque rating of the actuator has
been exceeded for a period of 5 seconds.
Multi-Function Technology
®
Specifi cations/Descriptions
M40035 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.