Danfoss MBS 1250 Operating guide

User Manual

PLUS+1® Compliant

MBS 1250 Pressure Sensor Function Blocks

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User Manual

PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Revision history Table of revisions

Date Changed Rev

March 2018 Added Prs_Snsr550b and Prs_Snsr_Gen function block. 0401

April 2016 CA

November 2011 BA

2 | © Danfoss | March 2018 11062069 | AQ00000100en-US0401

User Manual

PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Prs_Snsr40b Function Block

This function block configures the output of MBS 1250 pressure sensors with a nominal 0–40 bar [4000 kPa/580 PSI] range.

Inputs

Find out how the function block uses a reference voltage and a changing input voltage to produce PSI, kPa, dBar and Pct outputs.

Function Block Inputs

Input Type Range Description Snsr Pwr U16 0–5250 mV Inputs a reference voltage that the PLUS+1® controller also applies to the Pin 1 (+ Supply) on the pressure

transmitter.

Input U16 0–5250 mV The function block compares the changing Input voltage with the constant Snsr Pwr reference voltage to produce

PSI, kPa, dBar and Pct outputs.

The function block’s nominal operating range is between 10.00% and 90.00% of Snsr Pwr voltage. When the Input voltage reaches:

•

10.00% of the Snsr Pwr voltage, the function block’s output starts rising above zero.

•

90.00% of the Snsr Pwr voltage, the function block outputs its maximum nominal outputs of PSI and kPa. The maximum nominal output is specified by Bar and is limited to 2200.

•

100.00% of the Snsr Pwr voltage, the function block outputs its maximum over-pressure outputs of PSI and kPa at 112.50% of the output defined by Bar.

The maximum over-pressure output equals 112.50% of the maximum nominal output. The generic function block allows you to specify the pressure range allowed.

Outputs

Learn how the outputs of the general function block work.

Function Block Outputs

Output Type Range Description Status U16 —— Indicates if the Flt Pct value is within range or is set too high.

The Flt Pct sets the percentage that the Input voltage can rise above or fall below the function block’s operating range without setting a fault condition. You can change the Flt Pct value (1000 = 10.00%) on the inner page of the Prs_Snsr function block. The Status output uses the bitwise scheme.

•

0x0000 = Block is OK.

•

0x8008 = Flt Pct value is too high.

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PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Prs_Snsr40b Function Block

Function Block Outputs (continued)

Fault U16 —— Indicates if the voltage on the function block’s Input pin is too low or too high.

The Flt Pct sets the percentage that the Input voltage can rise above or fall below the function block’s operating range without setting a fault condition. You can change the Flt Pct value (1000 = 10.00%) on the inner page of the Prs_Snsr function block. The Fault output uses the bitwise scheme.

•

0x0000 = Block is OK.

•

0x8001 = Input value is too low.

•

0x8002 = Input value is too high.

PSI U16 0–35896 Indicates pressure in pounds per square inch (PSI).

1 = 1 PSI.

kPa U16 0–247500 Indicates pressure in kilopascals (kPa).

1 = 1 kPa.

dBar U16 0–24750

Pct U16 0–11250 Indicates pressure as a percent of the function block’s operating range.

Indicates pressure in decibars (dBar). 1 = 1 dBar.

10000 = 100.00%.

Status and Fault Logic

This topic describes how status logic and fault logic are indicated for the function block.

Status Logic

The status code indicates the calibration state of the function block.

Status logic

Condition Hex

Invalid setup. 0x8008 1000 Flt Pct > 1000 (10.00%). Output = 0. Reduce Flt Pct.

*

Bit 16 set to 1 identifies a standard Danfoss status or fault code.

*

Binary Cause Response Correction

Fault Logic

Learn how fault logic can indicate problems, causes of problems, and solutions.

Fault logic

Condition Hex

Input value is too low. 0x8001 0001

Input value is too high. 0x8002 0010

*

Bit 16 set to 1 identifies a standard Danfoss status or fault code.

*

Binary Cause Response Correction

Volt(age) is less than [10% of Snsr Pwr] - [Flt Pct of nominal

signal range (which is 80% of

Snsr Pwr)]. Snsr Pwr less than 0. Ensure correct software input is

Volt(age) is greater than [90% of Snsr Pwr] + [Flt Pct of nominal

signal range (which is 80% of

Snsr Pwr)].

Snsr Pwr greater than 5250.

Output = 0.

Output is extrapolated beyond

the maximum value up to 11250 (112.50%).

Output = 0.

Inspect for open circuit in wire connections to sensor.

made in the application.

Inspect for short circuit in wire

•

connections to sensor. Verify the correct pressure

•

sensor is used for the application.

Ensure correct software input is made in the application.

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User Manual

PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Prs_Snsr40b Function Block

Relationship Between Function Block Input and Output Signals

Use the plot to find out the relationships between the function block's Input voltages and its kPa and Pct outputs.

This function block’s:

Flt Pct value = 500 (5.00%) and its Snsr Pwr value = 5000 mV.

•

Nominal Input voltage ranges between 10.00% (500 mV) and 90.00% (4500 mV) of the Snsr Pwr

•

voltage. Nominal pressure output ranges between zero with the Input voltage at 500 mV and a maximum

•

nominal 4000 kPa/100.00% with the Input voltage at 4500 mV. Maximum over-pressure output = 4500 kPa with the Input voltage at 5000 mV. (4000 maximum

•

nominal pressure x 112.50% = 4500 kPa maximum over-pressure)

When the Input voltage:

•

Drops below 300 mV, the function block outputs an input too low fault. (500 mV – 5% of the 4000 mV nominal input voltage range = fault at 300 mV)

•

Rises above 4700 mV, the function block outputs an input too high fault. (4500 mV + 5% of the 4000 mV nominal input voltage range = fault at 4700 mV)

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User Manual

PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Prs_Snsr40b Function Block

Function Block Connections

Connections you can make with the function block are described.

Function block connections

Item Description

1 Sensor voltage (varies with pressure). 2 Sensor reference power voltage. 3 Function block status. 4 Function block faults. 5 Pressure in PSI. 6 Pressure in kPa. 7 Pressure in decibar (dBar) 8 Pressure in % of range.

MC Controller—Input Configuration

Configure MFIn and DigAn to accept the input of the function block. For MC Controllers, you route the function block’s Input through an MFIn or a DigAn. You must change the MFIn and DigAn default configurations to accept this input.

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User Manual

PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Prs_Snsr40b Function Block

Configure the MFIn

Learn how to configure MFIn to accept input from the function block.

1. In the GUIDE template, enter the Inputs page.

2. Enter the MFIn that receives the input.

3. Make the changes that are shown in this figure.

Configure the DigAn

Learn how to configure DigAn to accept input.

1. In the GUIDE template, enter the Inputs page.

2. Enter the page that receives the input.

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PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Prs_Snsr40b Function Block

3. Make the changes that are shown in the following figure.

SC Controller—Input Configuration

Configure MFIn and DigAn to accept the input of the function block. You route the function block’s Input through an MFIn or a DigAn. You must change the MFIn and

DigAn default configurations to accept this input.

Configure the MFIn

Learn how to configure MFIn to accept input from the function block.

1. In the GUIDE template, enter the Inputs page.

2. Enter the page that receives the input.

3. Make the changes that are shown in the following figure.

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User Manual

PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks

Prs_Snsr40b Function Block

Configure the DigAn

Learn how to configure DigAn to receive input from the function block.

1. In the GUIDE template, enter the Inputs page.

2. Enter the page that receives the input.

3. Make the changes that are shown in the following figure.

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Danfoss | March 2018 11062069 | AQ00000100en-US0401 | 11

User Manual

PLUS+1® Compliant MBS 1250 Pressure Sensor Function Blocks