Flowserve MX Electronic Actuator - Manual (Page 73)

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Limitorque MX Electronic Actuator FCD LMENIM2306-06 – 10/13
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4.19.2 Status
Default Setting is: OFF
Select “NO” to choose whether the inhibit is “ON” or “OFF.”
4.19.3 Custom Input Mode #1 – Momentary ESD/PSESD (Optional)
Custom software is available for the MX that permits the User to establish certain performance characteristics for partial
stroke (PS) testing and momentary contact closure ESD.
Note: These three inputs are normally configurable. However, when this custom mode is enabled, they are set to the
predefined configuration and cannot be changed by the customer.
Input 0 (normal default – ESD) terminal 30:
• Set as disabled, user input function, signal present
Input 1 (normal default – Open Inhibit) terminal 34:
• Set as enabled, partial stroke enable function, signal present = active
Input 2 (normal default – Close Inhibit) terminal 35:
• Set as enabled, partial stroke enable function, signal absent = active
The partial stroke enable signals are setup as redundant signals for safety. There are two signal inputs, and BOTH must
be in the active state. If the partial stroke enable inputs are in the active state, and an input is detected (>800 ms) on the
momentary ESD/PSESD input, then a partial stroke ESD test will be run. If the partial stroke enable inputs are not active
or in a fault state, and an input is detected on the momentary ESD/PSESD input, then the ESD will be latched in and the
actuator will perform ESD until the ESD Release is given.
NOTE: These three inputs are the normal open-close-stop inputs. When this custom mode is enabled, they are set to
the predefined configuration and cannot be changed by the customer. The only change the customer can make is to set
the momentary ESD action (if action is position – then also the target value for the ESD) and the partial stroke
target value.
Input 3 (normal default – stop) terminal 26:
• Set as enabled, ESD release function, signal absent = active
Input 4 (normal default – open) terminal 25:
• Set as enabled, ESD Release function, signal present = active
Input 5 (normal default – close) terminal 27:
• Set as enabled, momentary ESD/PSESD function, signal present > 800 ms = active, ESD action = Close, partial stroke
target position = 0% open
The ESD release signals are setup as redundant signals for safety. There are two signal inputs, and BOTH must be in
the active state. If there is an active ESD and both ESD release inputs are in the active state, the ESD will be unlatched
and the unit will return to normal operation. If the ESD release inputs are in a fault state, an active ESD will NOT be
released. The ESD release inputs will have no effect on a partial stroke ESD test. The momentary ESD/PSESD input will
be ignored if there is a signal present for less than 100 ms, and is guaranteed to latch in the ESD/PSESD if the signal is
present for greater than 800 ms. Once the ESD is latched in, the unit will perform the ESD action. In this case the ESD
will move the unit to the close limit and remain in ESD mode until the ESD release indication is given using the ESD
release inputs.