Flowserve 520MD Positioners - Manual (Page 4)

DD User Manual - Logix® 520MD+ Series Digital Positioner FCD-LGENSF0017-00 8/13
© Flowserve Corporation
4
1
STATUS
Allows access to real time command, position, temperature,
and, if equipped, pressure data. Allows access to change
the command source.
1.1 Cmd Source
Displays the source of the command signal (analog or
digital).
1.2 Change Command Source
Use to change the command source to/from Analog/Digital.
CAUTION: Changing Command Source may cause
closure member movement. Please, follow all safety
procedures.
1.3 Dgtl Cmd
Enter the digital command value, in percent of full stroke.
This variable is available only when the valve is being
positioned by a digital command (digital source) rather than
the 4-20 mA analog signal (analog source).
1.4
4-20 Cmd
Input 4-20 mA command expressed in percent of full scale
Input.
1.5 Cntrl Cmd
The modified command signal, in percent of full stroke, which
actually sets the controlled position of the valve. Cntrl Cmd
is generated after custom characterization, soft limits, and
minimum position cutoff parameters are evaluated. 4-20 mA
command and Cntrl Cmd can differ if custom
characterization, soft limits, or minimum position cutoff are
active.
1.6 Position
Actual stem position in percent of full stroke, as measured by
the position stem position transducer.
1.7
Deviation
The difference between the modified position command
(Cntrl Cmd) signal and the stem position signal expressed in
percent of full stroke. Deviation = Cntrl Cmd - Position
1.8
Posn Cutoff
Is the set point less or greater than the Minimum / Maximum
Position Cutoff defined in the Soft Limit / Characterization
Menu.
1.9
Temp
Circuit board ambient temperature
1.10 Pressure Lock
Indicates that the current position is within the Pressure
Control Window.
1.11 Pressures
Displays pressure values.
1.11.1 Supply Pressure Calibrated
Supply pressure in user units used as basis for pressure
sensor calibrations.
1.11.2 Port 1 ( % of Calibrated Supply)
Port 1 pressure value in percent of calibrated supply
maximum.
1.11.3 Supply ( % of Calibrated Supply)
Supply pressure value in percent of calibrated supply
maximum.
1.12 Positioner Settings
View current positioner settings: Diagnostics capabilities,
positioner model, and characterization.
1.12.1 Diagnostic Level
Indicates whether positioner is Standard, Advanced, or Pro.
1.12.2 Positioner Model
View whether the positioner has pressure sensors. 520 = No
pressure sensors, 521 = Has pressure sensors.
1.12.3 Characterization
Displays the position Characterization (linear, equal %, or
custom)
2
ALERTS AND ALARMS
Allows access to Current Alarms, Alarm Masks, Error History,
Temperature History, and the Hour Meters.
2.1 Current Alarms
View all current alarms, alerts, modes, and states
2.1.1 Modes
Initializing, Factory Reset State, Digital Command Mode,
Squawk Mode, Jog Command Mode, Signature In Progress.
2.1.2 Positioner Status
Position Deviation, Soft Stop Upper Limit, Soft Stop Lower
Limit, Position Upper Limit, Position Lower Limit, MPC Active,
Local Interface Disabled, Error History Reset.
2.1.3 Mechanical
Actuation Ratio Warning, Pneumatic Inability to Fail Safe,
Friction High Warning, Friction Low Warning, Friction High
Alarm, Friction Low Alarm, Valve Cycles Warning, Valve
Travel Warning.