Logix
®
420 Digital Positioner FCD LGENIM0106-07-AQ – 10/15
38
RRRY
PIEZO VOLTAGE HIGH ALARM
Description: The voltage driving the piezo is above the alarm limit. This
could indicate an error with the relay or the main board. The positioner
may still be functioning, but have reduced performance under some
circumstances.
PIEZO VOLTAGE LOW ALARM
Description: The voltage to the piezo is too low. The piezo may be
damaged. This may prevent the proper failure position upon loss of
signal/power. This condition may occur briefly on an air-to-close valve
that is held for long periods of time in the closed position, or an air-to-
open valve held in the open position.
Possible Solutions: Ensure the supply pressure is not low. If alarm
persists for more than 30 minutes, the Piezo assembly is damaged.
Replace the pilot relay.
RRRR
POSITION DEVIATION ALARM
Description: The difference between the command and the actual posi-
tion has been greater than the user-set limit for longer than a user-set
time.
Possible Solutions: Review active alarms and warnings to find root
causes of this alarm. The deviation settings can be changed in the Valve
Health page of the DTM.
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