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IQ3 Full Configuration Manual – Section: Settings
21
2.3.2-4 Control – Remote – Positioning
Remote Control
Hardwired
Control Source
Partial Stroke
Positioning
Auxiliary Mask
Analogue
Positioning
Deadband
5%
Hysteresis
2%
Inhibit Time (s)
2
Low Signal Pos.
0%
High Signal Pos.
100%
1/5
The Positioning option settings page with its default
settings is shown above.
Applicable for Analogue and HART control options
and for all Network control options where positioning
control is required. Settings are used to tune the actuator
positioning response.
• Deadband and Hysteresis are combined to set positioning
accuracy.
• Inhibit Time is used to set a dwell in the actuators response.
• Low/High Signal Position sets the range of the valve stroke
where positioning is required
.
1/5
Deadband
Range 0% - 25.5%. Default setting: 5%.
Affects positioning accuracy as a response to the process
control system desired value (DV) signal position. A smaller
deadband increases accuracy, however the widest deadband
should be set whilst maintaining good control in order to protect
the mechanical valve from excessive wear and/or to keep the
actuator within its electrical rating.
Deadband setting should be combined with 2/5 Hysteresis
setting. The actuator will run towards the DV position until the
actual position is within the set deadband minus the hysteresis
setting. This has the effect of the actuator stopping nearer to the
DV position. The actuator will not restart unless it overshoots and
runs outside the deadband or a new command places the new
desired position outside the deadband. Refer to figure 2.3-1.
To change, . The slider control will indicate the
deadband setting.
2/5
Hysteresis
Range 0% - 25.5%. Default setting: 2%.
Affects positioning accuracy as a response to the process control
system desired value (DV) signal position. A larger Hysteresis
setting will increase accuracy but the value set must not be
greater than that set for Deadband.
Hysteresis setting should be combined with 1/5 Deadband
setting. The actuator will run towards the DV position until the
actual position is within the set deadband minus the hysteresis
setting. This has the effect of the actuator stopping nearer to the
DV position. The actuator will not restart unless it overshoots and
runs outside the deadband or a new command places the new
desired position outside the deadband. Refer to figure 2.3-1.
To change, . The slider control will indicate the
hysteresis setting.
3/5
Inhibit Time
Range 0 – 255 seconds. Default setting: 5 seconds.
Sets a delay after the actuator stops as a result of reaching a
position consistent with a new DV position. For the period set,
the actuator will not respond to a change in DV. Inhibit time
is used to prevent unwanted operation as a result of a rapidly
oscillating or fluctuating DV signal or to slow actuator response
in order to protect the mechanical valve from excessive wear
and/or maintain actuator within its electrical rating.
To change, . The time set will be indicated.
Summary of Contents for IQ Multi-Turn
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