Flowserve MX Electronic Actuator - Manual (Page 48)

Limitorque MX Electronic Actuator FCD LMENIM2306-06 – 10/13
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4.8 Modutronic Option
The Modutronic option enables the actuator to be controlled via a milliamp input signal.
• If the Modutronic option has been purchased, it is automatically calibrated when position limits are set. No further
adjustments are required, unless the defaults do not suit the application.
• If the Modutronic option has not been purchased, the screens for changing Modutronic will not be available. To add
the Modutronic option, please consult Limitorque service at (434) 528-4400.
4.8.1 Status
Default = OFF
1. Select “NO” to change Modutronic status to “ON.” If “OFF” is selected, no further menus will be displayed.
4.8.2 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.
4.8.3 Fail Position
Fail position enables the customer to change the response of the actuator on loss of the milliamp signal.
Default = “CLOSE” Position
Fail position takes effect when the signal level falls below 2 mA or above 20.5 mA.
To Change the Default Position:
Select “NO” to choose whether the valve moves to “CLOSE” position, or “OPEN” position, or “STOP” (stops) in its
present position at the time of signal failure.
4.8.4 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:
Select “NO” to adjust the value between 1% and 50%, in 1% increments to suit the application, or 0.5% to 50.0% if the
position precision is set to XXX.X%.
4.8.5 Polarity (20 mA)
Polarity allows the user to change the valve position corresponding to the maximum milliamp value.
Default Setting is: 20 mA = Full Open
Select “NO” to select the required position of the valve that is to correspond to the maximum signal level of 20 mA.
Choose between: 20 mA = Full Close or Full Open.