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AL
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SPECS
MOUNTING
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ATION
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AINTENANCE
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LOGISTICS
63
NDX VALVE CONTROLLER
Operating Condition Diagnostics Limits
Parameter name
Description
Default value
Limits/options
Control Ratio Limit
Set control ratio alert limit.
If a value exceeds the limit or falls below 1/limit, a status is
activated for the device and an event is generated.
10
1100
Temperature Above High Limit
Set temperature high alert limit.
If a measurement exceeds the limit, a status is activated for
the device and an event is generated.
85 C
40 +85 °C
Temperature Below Low Limit
Set temperature low alert limit.
If a measurement goes below the limit, a status is activated for
the device and an event is generated.
40 C
40 +85 °C
Supply Pressure Above High Limit Set the supply pressure high limit at the actuator’s maximum
pressure rating.
Since the maximum pressure rating for the NDX positioner
is 8 bars this should be the highest limit if the actuator has a
higher rating.
If a measurement exceeds the limit, a status is activated for
the device and an event is generated.
8 bar
1.4 8 bar
Supply Pressure Below Low Limit
For the supply pressure low limit, the spring rating of a spring
return actuator can be used.
For double acting actuators, the low limit can be set at the
minimum air pressure that will allow the actuator to provide
sufficient torque to operate the valve.
If a measurement goes below the limit, a status is activated for
the device and an event is generated.
1.4 bar
1.4 8 bar
Software Limit Switches
Parameter name
Description
Default value
Limits/options
Limit Switch Closed
Set the value for limit switch closed.
When the set value is reached a status is generated.
1 %
20 – 120 %
Limit Switch Open
Set the value for limit switch open.
When the set value is reached a status is generated.
95 %
20 – 120 %
13 DEVICE TYPE MANAGER (DTM)
OPER
ATION
