Electro-Sensors FB420 Manuel utilisateur

Description:

Electro-Sensor’s FB420 is a shaft speed sensor that provides a

4-20 mA signal that is directly proportional to the rotational

speed of a monitored shaft.

Since both the 4 mA and 20 mA calibration points are

programmable the user can also if desired operate the FB420 with

the 4 mA offset from 0 RPM.

The FB420 has a 4 digit LCD display that is used for calibration

and for trouble-shooting. The LCD is capable of displaying from

‘0.000’ to ‘9999.’ RPM, or from ‘04.00’ to ‘20.00’ mA.

The FB420 has one relay that can be programmed for either

failsafe over/underspeed alarm.

FB420 Installation:

The FB420 needs a rotating target installed on the application’s

drive-shaft, etc. A typical rotating target is a 255 Pulser Disc (with

or without an optional EZ-Mount bracket), or an optional custom-

made Pulser Wrap. (See Figure’s 4a, 4b, and 4c).

0.25 4.40

1.38

2.38

4.00

1.25

2.75

1.63

0.56

Ø0.32

0.26

1.84

4.81

3.90

1“ NPT

Figure 1: FB420 Dimensions w/Bracket and U-Clamp

Figure 2: FB420 Front-View

Electrical connections

The FB420’s electrical connections are as follows:

+24Vdc

Power Supply

(-)

(+) PLC, Etc.

FB420

TB1-2

4-20mA

Shield

TB1-1

TB1-3

250 to 500

ohm load

Ammeter

(optional)

Figure 3:

• Connect any shield wire to the earth ground (if used).

• Connect TB1-1 to the power-supply (+24 Vdc) terminal.

• ConnectTB1-2toaresistiveloadof250Ωto500Ω,(usually

this load is internal to a PLC, etc.).

• Connect TB1-3 to the power-supply (-) terminal.

Note: TB1-2 is the 4-20 mA DC output line.

 Theothersideofthe250Ωto500Ωloadmustbe 

connected to the power-supply (-) terminal.

FB420 Shaft Speed Sensor

6111 Blue Circle Drive

Minnetonka, MN 55343

Phone: 952.930.0100

Fax: 952.930.0130

ISO 9001:2000 Certied

Free Catalog and Application Assistance

1.800.328.6170

Visit Us Online

www.electro-sensors.com

990-003400 Revision C

Pulser Disc:

The end of the shaft to be monitored must be center drilled to a

depth of 1/2–inch with a #21 drill and tapped for a 10-32 UNF.

After applying Loctite™ or a similar adhesive on the threads

to keep the pulser disc tight, the pulser disc should be attached,

decal side out with the supplied 10-32UNF machine screw and

lock washer. Dimension (A )is 1/16 inch to 1/4 inch.

The center-line of the magnets (B) must align with the center of

the sensing head as the Pulser Disc rotates.

Figure 4a: FB420 with 255 Pulser Disc

EZ-Mount Bracket with Pulser Disc (Optional)

Shaft Center Drilled

and Tapped for

1/2-13 UNC 2A

Retaining

Washer

(Included)

Spacer

(Included)

Pulser Disc (Included)

EZ-Bracket

Assembly

FB420

Figure 4b: FB420 with EZ-Mount Bracket

Pulser Wrap (optional):

Pulserwrapsarecustommanufacturedtottheshafttheywill

be mounted on. When the wrap is shipped, four Allen-head cap

screws hold the two halves of the wrap together. These screws

must be removed so the wrap is in two halves. Place the halves

around the shaft, reinsert the screws and torque them to 8 foot-

pounds. Dimension (A) is 1/16 inch to 1/4 inch.

The center-line of the magnets (B) must align with the center of

the sensing head as the Pulser Wrap rotates.

Figure 4c: FB420 with Pulser Wrap

SW2

SW1

321

TB2

321

TB1

SW1: Increment Button

SW2: Enter Button

Relay LED

TB1-1: +24Vdc Pwr

TB1-2: 4-20mA Out

TB1-3: DC Ground

TB2-1: N.O.

TB2-2: Common

TB2-3: N.C.

Figure 5: FB420 Rear-View (Cover Removed). Showing the

power/signal terminal TB1, the relay terminal TB2, the push-

buttons SW1 and SW2, and the relay LED

2-4

Free Catalog and Application Assistance

1.800.328.6170

Website: www.electro-sensors.com

990-003400 Revision C

List of Variables

VA R Mnemonic Description Range Decimal Place Default User’s Value

01 Pulses Per Rev Pulses per revolution of target 0001. to 9999. Fixed at XXXX. 0008

02 Min. RPM RPM value corresponding to 4 mA 0000 to “97.5% of Var03” dec pt tied to Var03 0000

03 Max. RPM RPM value corresponding to 20mA 0.000 to 9999. User selectable 200

04 Relay Function Select Unused, Over-speed, Under-speed 0000. to 0002. Fixed at XXXX. 0000

05 Relay Set-point RPM Relay alarm trip point in RPM 0000 to 9999 dec pt tied to Var03 0000

06 Relay Set-point Delay Alarm event ‘wait’ time in seconds 0000. to 0030. Fixed at XXXX. 0000

The FB420 has two modes of operation:

Normal Mode:

This mode indicates the target’s speed via the 4-20 mA output

signal. The LCD display shows the shaft speed in RPMs, or as a

mA value (04.00 to 20.00 mA). The relay energizes or

de-energizes as per the RPM set-point value.

‘Normal Mode’ is indicated by the absence of the “VAR” icon in

the lower left corner of the display.

Toggling the view in Normal Mode:

Press the SW1 button to toggle the LCD between displaying

the speed value in ‘RPM’ or in ‘mA’.

· When displaying ‘RPM’ values the LCD

does not show the “RATE” icon in the lower right

corner of the display.

· When displaying ‘mA’ values the LCD does show the

“RATE” icon in the lower right corner.

Program Mode:

This mode allows the user to change the variables. The LCD

display shows the present active variable or its value. ‘Program

Mode’ is indicated by the presence of the “VAR” icon in the

lower left corner of the display. Programming is accomplished

by utilizing the two pushbuttons: the Increment button (SW1),

and the Enter button (SW2).

(See Figure 5 showing location of SW1 and SW2).

To enter the Program Mode:

- Press the enter button (SW2). The “VAR” icon will display

and the 4 digits will show “Pr01”.

- Press the Increment button (SW1) repeatedly until you get to

the variable you want to change.

Note: There are 6 user variables, Pr01 through Pr06.

- Press the Enter button (SW2) to access that variable.

- While in that variable you must use the Increment button

(SW1)tochangetheactivedigit(ashingdigit),thenthe

Enter button (SW2) to save and work your way through all the

digits and the decimal place.

- When you are done with that variable you will see “Pr0X, the

‘X’ being the variable you just programmed.

- To step to the next variable use the Increment button (SW1).

To exit the program mode repeatedly press the Increment

button (SW1) until the “VAR” icon disappears. The FB420 is

now back in the normal mode.

Resetting the FB420’s variables to factory-defaults:

- Remove the +24 VDC power.

- Simultaneously press and hold the SW1 and SW2 buttons.

- Apply the +24 VDC power.

- When the LCD shows “rESE”, release the buttons.

- The user variables are then automatically reset to the factory-

default values.

LCD

Display

Messages

· meanings,

· effects,

· how to clear them if necessary (troubleshooting)

Err0

· Var02_MIN_RPM is greater than 97.5% of

Var03_MAX_RPM.

· The output signal is 12 mA, and the relay is in the

de-energized ‘alarm’ state until Err0 is cleared.

· Verify Var02_MIN_RPM and Var03_MAX_RPM,

and modify if needed.

Err1

· The FB420’s programmed MaxHz is above the

maximum allowed 9999 Hz: (MaxHz > 9999).

MaxHz = Var01_PPR * Var03_MAX_RPM / 60.

· The output signal is 12 mA, and the relay is in the

de-energized ‘alarm’ state until Err1 is cleared.

· Verify Var01_PPR and Var03_MAX_RPM, and

modify if needed.

Err2

· The FB420’s programmed MaxHz is below the

minimum allowed 0.5 Hz: (MaxHz < 0.5).

· The output signal is 12 mA, and the relay is in the

de-energized ‘alarm’ state until Err2 is cleared.

· Verify Var01_PPR and Var03_MAX_RPM, and

modify if needed.

Err3

· The system is running at a speed above the

FB420’s absolute maximum rating of 9999 Hz

(i.e., above 9999 Hz + a safety margin).

· The output signal is 20 mA during an Err3.

· Verify Var01_PPR and Var03_MAX_RPM, and

modify if needed.

Or reduce the speed.

Or use a rotating target with a lower PPR.

Err4

· The system is running at a speed above the

FB420’s internal range as set by the MaxHz value.

(Note: The FB420 automatically chooses

the best range in which to operate, as per the

MaxHz value. The ranges are: 0 to 9.999 Hz,

0 to 99.99 Hz, 0 to 999.9 Hz, or 0 to 9999 Hz).

· The output signal is 20 mA during an Err4.

· Verify Var01_PPR and Var03_MAX_RPM, and

modify if needed.

Or reduce the speed.

Or use a rotating target with a lower PPR.

Flashing

“9999”

· The FB420 is displaying the speed in ‘RPM’, but

the speed is above the LCD’s ‘9999’ capability.

· The output signal is 20 mA during this warning.

Flashing

“04.00”

· The FB420 is displaying the speed in ‘mA’, but the

speed is below the Var02_MIN_RPM.

· The output signal is 4 mA during this warning.

Flashing

“20.00”

· The FB420 is displaying the speed in ‘mA’, but the

speed is above the Var03_MAX_RPM.

· The output signal is 20 mA during this warning.

“St0P”

· The monitored shaft is stopped.

· Or, the FB420 is gapped too far from the Disc or

the Wrap.

· Or, the Disc or Wrap is damaged.

· Or, the FB420 is damaged.

· The output signal is 4 mA during this message.

3-4

Free Catalog and Application Assistance

1.800.328.6170

Website: www.electro-sensors.com

990-003400 Revision C

FB420 General Specications:

Input Power Input Current Fuse Type

REQUIRES

ISOLATED

+24 VDC ±10%

55mA (when 20mA

signal and relay

energized)

REQUIRES

External Fuse 0.100A

slo-blo

Input Signal Parameters

Type Magnetic alternating

Range of Operation

Overall = 0.1 Hz to 9999 Hz.

(With 8 PPR = 0.75 RPM to 9999* RPM.

*Note: the LCD can only display up to 9999).

Gap distance 1/16” to 1/4”

Analog Output

Signal Parameters

Type

4-20 mA, with programmable end-points:

(4 mA @ user’s Min RPM)

(20 mA @ user’s Max RPM)

Accuracy ±0.7%

4-20 mA

Resolution

Depends on calibration, but can be a best of

0.001 mA per increment

Required

impedance 4-20mAoutputneedsa250to500Ωload

Max signal distance

Using a 3-conductor cable with

17.5Ω/1000ft.perconductor,themaximum

length of cable usable with the FB420 is:

·3800 ft. when not using the relay

·2300 ft. when using the relay

Relay Output Data Parameters

Number Available 1 SPDT Form C

Relay Contact Rating 5 Amp @ 30 Vdc

5 Amp @ 250 Vac

Relay Functions

Fail-safe ‘alarm’ state is relay de-energized:

·Unused,

·Fail-safe Over-speed,

·Fail-safe Under-speed,

Physical/Enviroment Parameters

Class I, Div 1, Group C, D

Class II Groups E, F, G

UL File: E249019

Additional Rating NEMA 4X, Gasket Provided

Operating Temp -40ºC to +65ºC (-40ºF to +149ºF)

Storage Temperature -40ºC to +80ºC (-40ºF to +176ºF)

Humidity 0% to 90% non-condensing

Denitions:

Pulse Per Rev (Var01)

The Pulse Per Rev value, or PPR, is the number of pulses generated

per revolution of the magnetic target mounted on the rotating shaft.

Note: See LCD messages “Err1” through “Err4” regarding Var01.

MIN RPM value (Var02)

The MIN_RPM value sets the speed corresponding to an output of

4 mA. The MIN_RPM value can be anywhere from 0000** RPM up

to 097.5% of Var03 MAX_RPM, with the decimal point locked in

the same position as Var03.

**Note: If Var02 = 0000 RPM, then the corresponding 4 mA speed is

either 0.1 Hz or 0.5 Hz, as per the ‘MaxHz’ value.

Note: See LCD message “Err0” regarding Var02.

MAX RPM value (Var03)

The MAX_RPM value sets the speed corresponding to 20 mA output.

Note: See LCD messages “Err0” through “Err4” regarding Var03.

Relay Function Selection (Var04)

The Relay Function Selection value determines how the relay responds.

The choices are:

· Unused (0000),

· Fail-safe Over-speed (0001),

· Fail-safe Under-speed (0002).

Relay RPM Set-point value (Var05)

The Relay RPM Set-point value programs the trip point for the relay.

The relay drops when the RPM set-point value is passed (i.e., goes into

the de-energized ‘alarm’ state, with the green relay LED = OFF).

Note: There is however a 6.25% hysterisis for pulling-in the relay

(i.e., returning to the energized ‘non-alarm’ state, with the green relay

LED = ON).

· For under-speed operation it means the shaft speed must be 6.25%

faster than the set-point to pull-in.

· For over-speed it means the shaft speed must be 6.25% slower than

the set-point to pull-in.

Note: See Figure 5 showing the location of the green relay LED.

Relay Set Point Delay (Var06)

The Relay Set Point Delay determines how many seconds an ‘alarm’

event condition must exist before de-energizing the relay.

Loss of feedback

If feedback pulses are lost when running, the FB420 waits an amount of

time equal to “(1/real-time-frequency) + another 12.5% of that” before it

begins to cascade the 4-20 mA output down towards 4 mA, and the LCD

down towards “St0P”.

Software identication

Duringpower-uptheLCDrstshows“8.8.8.8.” along with the icons

“VAR” and “RATE” (as a test). Next, the LCD shows the software ID in

the “X.X.X.X.”format,wherethersttwodigitsaretheversionnumber,

and the last two digits are the revision number.

Resolution (of the 4-20 mA signal, and LCD’s RPM value)

The 4-20 mA signal: For best resolution of the 4-20 mA output, the

FB420 automatically selects from one of four internal operating ranges

as per the programmed ‘MaxHz’ value. The ranges are:

· If ‘MaxHz’ is between 0.5 Hz and 9.999 Hz,

then the internal operating range = 0.1 Hz to 9.999 Hz.

· If ‘MaxHz’ is between 0.5 Hz and 99.99 Hz,

then the internal operating range = 0.1 Hz to 99.99 Hz.

· If ‘MaxHz’ is between 0.5 Hz and 999.9 Hz,

then the internal operating range = 0.5 Hz to 999.9 Hz.

· If ‘MaxHz’ is between 0.5 Hz and 9999.Hz,

then the internal operating range = 0.5 Hz to 9999.Hz.

This allows the FB420 to use the smallest frequency range to cover

the application, thus improving resolution. Then depending on the

programmed MIN_RPM and MAX_RPM values, the resulting 4-20 mA

resolution can be as tight as 0.001 mA per increment.

The LCD’s RPM value: The Var03_MAX_RPM’s decimal point

position affects the resolution of the LCD displayed RPM value.

For best resolution of the displayed RPM value, program Var03 with the

greatest number of decimal places possible (XXXX. to X.XXX).

Note: Var03 decpt position has no effect on the 4-20 mA resolution.

Note: Specications subject to change without notice.

4-4

Free Catalog and Application Assistance

1.800.328.6170

Website: www.electro-sensors.com

990-003400 Revision C

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