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Limitorque QX Electronic Actuator FCD LMENIM3306-06 – 07/14
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4.10.6 Proportional Band
Proportional band is the range of errors between position and demand signal that will produce reduced speed (pulsing).
Default = 15%
To change from the default, select “NO” until the required value is displayed. The value is adjustable between 1% and
100%, in 1% increments.
4.10.7 Deadband
Default =+/- 2%
The deadband should be wide enough to prevent “hunting” of the actuator but as low as possible to give adequate
response to changes in the error signal.
To Change from the Default Range:
Select “NO” to adjust the value between 0.5% and 50%, in 0.5% increments to suit the application.
4.10.8 Offset
Default = 4 mA/20 mA
No options are available. Select “YES.”
0-10 VDC is available on all units shipped after 6/01/03.
4.10.9 Move To
If positioning is selected as an action, then the Move To dialog will appear. Position is configurable from 0-100%.
4.10.10 Comm Loss Delay
Default = 60 sec.
The User may select the amount of time delay before communication loss is flagged to the network. This selection is
configurable from 0-120 seconds.
4.10.11 Comm Loss Action
Default = None
The User may select what action the actuator should take when network communication is interrupted. This action is
configurable as Close, Open, Stop, Position.
4.11 FF Option
FF option enables the actuator to be controlled by a Foundation Fieldbus communications signal. If the option has been
purchased, it is automatically enabled. A Fieldbus System configuration tool must be used by the customer to set the FF
address.
NOTE: If the FF option has not been purchased, the screens for changing FF will not be available. To add the FF option,
please consult Limitorque service at (434) 528-4400.
QX Multi-control Mode Operation - The QX is equipped with the ability to hardwire to digital inputs for control, set-up
for analog control (Modutronic), or control via network protocols. In order to utilize this feature, select “Multi-control
mode” operation located in Section 4.17, Remote Mode. This is the default setting for remote control. There are three
modes of remote control when remote mode is configured for multi control: digital control, analog control, and network
control. Digital and network control operation is based on the last command received. Analog operation is initiated by
either toggling user input 2 (configure for CSE input) or breaking and reapplying the analog control.
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