view user manual (pdf) - dyna-flo control valves

Operation
3 Digital input DI1 or DI2 active
A fault message is generated when the digital input is activated at the
the corresponding setting of the parameter “47. FCT”, function of the
fault message output and the parameter “42.BIN1”, function digital input
1. This may be a switch for stuffing box monitoring, a temperature
switch or a limit value switch for example.
Digital input 2 (on the alarm module option) can be configured in the
same way.
4 Monitoring of number of strokes
5 Monitoring of number of changes of direction
The two values number of strokes and number of changes of direction
are compared continuously with the limit values which are specified
with the parameters “50. STRK” and “51. DCHG”. The fault message
output responds when exceeded. Both functions can be deactivated
with the parameter setting ”OFF”.
6 Monitoring of the bottom hard stop (valve seat)
7 Monitoring of the top hard stop
Monitoring of the bottom hard stop is activated when the parameter
“52. ZERO” has a value¸OFF. Errors of the valve seat can be detected
with this function for example. Exceeding of the limit value may hint at
deposits or foreign bodies in the valve seat. Exceeding the limit value
may be caused by wear of the valve seat. Mechanical maladjustment of
the position feedback may also trigger this error message.
Monitoring takes place every time the valve is in tight closing position.
The current position is compared with the one determined during initialization
as a bottom end stop. Activation of the tight closing bottom function
(parameter “39.YCLS”) is therefore a prerequisite.
Example: 3% is set as a value. Normally the setting 0% is adopted
when closed. If a value >3% or