Emerson Process Management MSL600 manual MA current output parameters, Current output adjust

Page 22

 

Installation, Operation & Maintenance Manual

MSL600

IP262/Z0, Rev. AB

February 2012

 

 

5.4 mA current output parameters

The operation of the current output is programmed by four parameters and is always controlled by the sludge blanket level.

The current output parameters are found in SETUP – OUTPUT – CURRENT OUTPUT.

The parameters are as follows:

￿Low range val (Lower range value)

This parameter allows the user to reference the programmed minimum current output (0 or 4mA) to any point in the programmed blanket level measurement range.

The default condition is that the programmed minimum current corresponds to 0m (0 feet), the tank bottom.

￿Up range val (Upper range value)

This parameter allows the user to reference the maximum 20mA current output to any point in the programmed blanket level measurement range.

The default condition is that 20mA corresponds automatically to the programmed tank depth parameter less the top blanking distance. This level is programmed by the tank depth parameter which by default is set to be 7.000m (23.00 feet). The 20mA level for default settings therefore corresponds to a sludge blanket level of 6.7m (22.1 feet)

￿

￿Alarm action

This parameter is selectable from a list and determines the action to be taken by the current output under alarm conditions.

The allowed actions are:

•Go to 3.6mA

•Go to 21mA

•Hold last reading

￿0/4-20mA (0-20mA or 4-20mA setting)

This parameter sets the current output range from a list to be either 0-20 or 4-20mA.

5.5Current output adjust

The current output is calibrated in the factory and should not require any adjustment.

However, if required, it is possible to adjust the 4mA and 20mA points using a calibrated meter. This is done by following the procedure detailed below:

1.Connect a milliammeter to the terminal block marked CURRENT OUT ISOLATED between the 0V and the IO connections.

2.Put the system off line so that the ‘Go Off line?’ padlock is open.

3.Access the SETUP – SYSTEM – TEST – CURRENT OUTPUT menu.

4.Select either the “4mA out adjust” or the “20mA out adjust” and press ￿.

5.Read the actual current on the calibrated meter.

6.Enter this value in the chosen parameter and press ￿.

7.Check that the actual current is now exactly 4mA or 20mA.

For diagnostic purposes the current output can be driven to any value between 4mA and 20mA by accessing SETUP – SYSTEM – TEST – CURRENT OUTPUT – Set current.

With a suitable meter connected to the current output terminals a value can programmed on the control unit and the same value will appear on the meter.

This programmed current will remain until the ‘Go On line?’ padlock is closed.

Page 22

Page 21 Page 23
Image 22
Page 21 Page 23
Contents Installation, Operation & Maintenance Manual MSL600Contents MSL600 12.1 12.2Before Operating this Device the Manual should be Read Fully About the MSL600 About this ManualHuman Machine Interface Important MSL600 featuresSelf-cleaning Mounting bracketAs a system LocationCircular clarifiers Application planningRotating bridge Rectangular clarifiers Static bridgeLocation InstallationPreliminary checks Mounting bracket attachmentInstalling the bracket on the bridge Attaching the MSL600MSL600 mounting Power and other electrical connections Transducer connectionsExternal connection terminals Cable extension Programming DisplayContrast viewing angle control Keypad and Menu NavigationSecurity On-line/Off-lineQuick start parameters Tank depth Bottom referenceTransducer self-cleaning Determination of tank depthCurrent output adjust MA current output parametersRelay parameters AlarmTransducer out-of-water time Digital input Main menu item Detailed operationMenu structure Menu Item DescriptionParameter editing Direct accessScrolling Application parameters Installation parametersMain menu parameters Start On P250 De-sludge parametersDescription P240 Stop On P251Interval P254 Stop If P252Start Time P253 Max Retries P257Cleaning parameters MA output parametersAlarm Action P402 4 0/4-20mA P403Alarm mode relay RL1 and RL2 parameters P540 to Relay RL1 mode P410 and RL2 mode P420Table B Relay Parameter numbers De-sludge mode relay RL1 and RL2 Fault mode relay RL1 and RL2 parameters P560 to P570Set point mode relay RL1 and RL2 On mode relay RL1 and RL2Relay overrides Min ON, Max ON, and Min OFF Display parameters HMIRelay On and Off Points HMI upper, middle, and lower display optionsClear Trend Backlight On/Off P575Clear Profile Log Interval P590 Low Mem Alarm P593Logging parameters Fast log P5911 Alg. Select P620 Parameter values Default Min Max 128 1024Engineering parameters Common algorithm parameters P621 to P629Default Min Max +85 105 185 Parameter values Default Min Max 100 Top Blanking P623Parameter values Default Min Max 9999 Upr S-nat Temp P625 Noise Alrm Lev P622Lwr S-nat Temp P626 Default Min Max +85 185 SoS constant P627Default metric m/s Bottom Blanking P628Significance P630 Parameter values Default Min Max Lost Echo Rnge P633Municipal 1 parameters P630 to P637 Sharp Echo Reject P631Parameter values Default Min Max 255 Parameter values Default Min Max Dirty Mult P636Parameter values Default Min Max Lost Echo Time P637 Noise SD Mult P635Threshld Offset P640 Parameter values Default Min Max 100Municipal 2 parameter P640 Threshold level = Threshld Offset P640 + Noise Level D834Auto Cycle function Load Defaults functionSystem parameters Display testSettings parameters P730 to P737 and Base Units selection Comms parameters P710 to P716PIN parameter P740 Fixed parameters D750 to D753Readings and diagnostics parameters Readings parameters D800 to D834Diagnostics parameters D835 to D852 Max Xdr Temp D851 Speed of Sound D850Min Xdr Temp D852 Technical reference MaintenanceTroubleshooting Transmit pulse and echo processingProgramming chart Sub-menu Level Parameter Title Par No Main Menu OptionProgramming chart … Direct Model No Specification12.1 MSL600 OutputsAdditional specification notes Weight12.2 MSL603 transducer Dimensional drawings MSL600 Bridge mounted unitMSL600 and MSL603 assembly Parts required MSL603 transducer cable extensionFitting instructions MSL600 MSL600 Emerson Process Management Rosemount Measurement
Top Page Image Contents