GENER
AL
INFO
SPECS
MOUNTING
ST
AR
T UP
OPER
ATION
M
AINTENANCE
DIMENSIONS
HO
W
TO
ORDER
LOGISTICS
71
NDX VALVE CONTROLLER
13.5.3.6 Counters
Fig. 71
Parameter name
Description
Total Operation
Time
Valve controller operation time, in hours.
Valve
Parameter name
Description
Travel Ratio
Valve Travel / Valve Reversals
Total Valve
Travel
This counter increases by 1 whenever he valve
has travelled one full stroke, or 100 % of valve
movement.
Total Valve
Reversals
This counter increases by 1 whenever the direction
of valve movement changes.
Control Ratio
Valve Reversals / Setpoint Reversals
Actuator
Parameter name
Description
Total Actuator
Travel
This counter increases by 1 whenever the valve
has travelled one full stroke, or 100 % of valve
movement.
Total Actuator
Reversals
This counter increases by 1 whenever the direction
of valve movement changes.
Setpoint
Parameter name
Description
Total Setpoint
Travel
This counter increases by 1 whenever the cumula
tive setpoint changes.
Total Setpoint
Reversals
This counter increases by 1 when the direction of
the setpoint changes.
HART Diagnostics
Parameter name
Description
Total
Messages In
Total HART messages received
Total
Messages Out
Total HART messages sent
HART Com
munication
Error Rate
during last
hour
HART communication error rate in percentage
during last hour
HART Com
munication
Error Rate
during last
day
HART communication error rate in percentage
during last day
13.5.3.7 Trends
Steady State Deviation Trend
Steady State Deviation is used to determine the basic
control accuracy of the valve. It is updated whenever the
setpoint is considered to have reached the desired position
as precisely as possible.
Steady State Deviation trend is stored in the device mem
ory. Trend shows the previous values of deviation during
24 hours, 30 full days, 12 full months, and 25 full years.
A change in the steady state deviation trend can be caused by:
•
The general performance of the valve and actuator
deteriorating.
•
higher friction of the valve trim
•
higher friction in actuator
•
actuator diaphragm or piston seal damage
•
change in process conditions
•
supply air problem
Steady State Deviation Trend high limit can be modified
by typing the value in the text box or by moving the limit
line in the trend graph.
Fig. 72
13 DEVICE TYPE MANAGER (DTM)
OPER
ATION
Содержание NELES NDX 511 Series
Страница 80: ...80 NDX VALVE CONTROLLER 15 1 NDX1510 LINEAR APPLICATION ROTARY APPLICATION Fig 98 15 DIMENSION DRAWINGS ...
Страница 82: ...82 NDX VALVE CONTROLLER 15 3 NDX_512_ Tightening torque 15 Nm 48 Fig 100 15 DIMENSION DRAWINGS ...
Страница 84: ...84 NDX VALVE CONTROLLER Fig 103 NDX_511_ Fig 104 NDX_512_ 15 DIMENSION DRAWINGS ...