Limitorque QX Electronic Actuator FCD LMENIM3306-06 – 07/14
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QX Multi-control Mode Operation - The QX is equipped with the ability to hardwire to digital inputs, 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.
4.13.1 Status
Default = ON
DN Status enables user to change from the default condition to turn on and off the digital control capability of the
actuator.
4.13.2 Baud Rate
Default = 125K Baud
Baud rate changes the communication speed from the default to match the application.
To Change from the Default Speed:
Select “NO” to choose between 125k, 250k, 500k baud rate depending on the design of the DN system. Refer to the
contract documentation.
4.13.3 Network Address
Default = 1
Network address allows user to assign a unique network address to an actuator.
1. The network address must be entered in accordance with the Instrument Data Sheet, and care must be taken to
ensure that the same address is not used anywhere else in the same network.
2. Select “NO” for small incremental changes or hold it continuously in that position for larger changes until the
required value is displayed. The address may be set at any value between 001 and 63.
To Change from the Default Range:
Select “NO” until the required scale is displayed. 0-255 and 0-4095 counts are available.
4.13.4 ESD Action
A network ESD function can be enabled after the ESD configuration has been established for the unit. This network ESD
can be selected to either “IGNORE” the network command; or Close, Open, Stop, Position the actuator.
4.13.5 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.
4.13.6 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.
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