Danfoss KE02901, 2 Oscillator-Demodulator Installation guide

Brand: Danfoss

Model: KE02901, 2 Oscillator-Demodulator

Type: Installation guide

KE02901, 2

Oscillator-Demodulator

Issued: February 1992

DESCRIPTION

The KE02901, 2 Oscillator-Demodulator is designed for use

as an intermediate device, permitting output from an

inductive sensor to be used as input to controllers or

amplifiers that accept millivolt dc signals. The Oscillator-

Demodulator provides 400 Hz excitation to an inductive

sensor such as the Danfoss KS10201 Level Sensor

and demodulates the Sensor output voltage into a dc

millivolt signal. The millivolt output is suitable for use as input

to controllers or amplifiers such as the Danfoss

ACE100A and KE0550X. The KE02902 model is identical to

the KE02901 except that it features an internal filter circuit

that squelches high frequency machine vibrations

transferred from the sensor.

ORDERING INFORMATION

SPECIFY

1. Model Number KE02901 or KE02902 Oscillator-

Demodulator.

2. Controller or Amplifier if needed; ACE100A1003 or

KE0550X.

3. Sensor if needed; KS10201.

ORDER NUMBER DESCRIPTION

KE02901 Oscillator-Demodulator Panel

KE02902 Oscillator-Demodulator Panel

With Roll-Off Filter

Amplifier Module (Part Number KE0550X) Mounted

Above the Oscillator-Demodulator.

FEATURES

• Reliable solid state circuitry extends the useful life of the

panel.

• Standoffs are pre-assembled to the panel for ease of

mounting.

• Moisture and corrosion resistant.

• Standoffs permit quick mounting of the KE0550X

Amplifier Module to the Oscillator-Demodulator, making a

compact assembly combination as shown in the Amplifier

Module photograph.

• Withstands mobile equipment vibration and shock

conditions.

AMPLIFIER MODULE

BLN-95-8938-5

BRIDGE NETWORK SHEMATIC

389B

Schematic of the KE02901, 2 Bridge Network Used in Slope Applications.

TECHNICAL DATA

OPERATING VOLTAGE

11 to 15 Volts dc

POWER CONSUMPTION

3 watts maximum

SENSOR EXCITATION

The KE02901, 2 Oscillator-Demodulator provides 1.5

Volts RMS at 400 Hz into a 10 ohm load such as the

primary of the Danfoss KS10201 Level Sensor.

SENSOR INPUT

The voltages across the two isolated windings of the

inductive sensor should be equal at null. With a change of

transducer position, the voltage of one winding should

increase as the voltage of the other decreases. No

voltage should fall below 1 Volts RMS nor rise above 15

Volts RMS. In a typical application using the Danfoss

KS10201 Level Sensor, the output voltage of the sensor

at null is approximately 4.4 Volts RMS.

ERROR OUTPUT VOLTAGE

An increase of 0.075 Volts across terminals E and F and

a corresponding decrease of 0.075 Volts across

terminals C and D results in and error signal of 80

millivolts output across terminals J and N. When the

KS10201 Level Sensor is used error output voltage

changes a nominal 80 millivolts per 1% slope error.

THEORY OF OPERATION

The KE02901, 2 Oscillator-Demodulator obtains 12 Volts

dc from the amplifier it is connected to. The system is

made up of two basic sections, the Oscillator and the

Demodulator.

OSCILLATOR

The Oscillator runs on a regulated 6 Volts dc. An internal

circuit supplies two signals 180° out of phase to a power

H configuration of four transistors. The transistors flip-

flop the signal, alternately putting a positive and negative

signal on two wires which connect to the microsyn

sensor.

DEMODULATOR

Refer to the Bridge Network Schematic. The microsyn

inductive sensor generates an ac signal in each of its two

secondaries, which are coupled to the bridge network. A

pair of full-wave bridge rectifiers convert the ac signal to

dc. The dc voltage charges two capacitors, whose ratio of

voltages is compared to ratio of voltages determined by

the remote setpoint potentiometer. Any difference

between the two ratios (the error signal) is then

transferred to the amplifier. In control applications, the

remote setpoint potentiometer determines the desired

operation slope. In steering applications, the steering

feedback potentiometer is connected in place of the

remote setpoint potentiometer. Varying the

potentiometer setpoint changes the bridge ratio and calls

for a new null point for the sensor.

BLN-95-8938-5

290A

Dimensions of the KE02901, 2 Oscillator-Demodulator With the KE0550X Amplifier Module in Millimeters (Inches).

DIMENSIONS

ENVIRONMENTAL

VIBRATION

Withstands a vibration test designed for mobile

equipment devices that includes two parts:

1. Cycling from 5 to 2000 Hz over a range of ±1.0 g's to

±8.0 g's for a period of one hour (if there are four

resonant points), two hours (if there are two or three

resonant points) and for three hours (if there is one or

no resonant point). The cycling test is performed on

each of the tree major axes.

2. Resonance dwell for one million cycles over a range

of ±1.0 g's to ±8.0 g's for each of the four most severe

resonant points on each of the three major axes.

SHOCK

Withstands a shock test designed for mobile equipment

devices that consist of three shocks of 50 g's and 11

milliseconds duration in both directions of the three

major axes for a total of 18 shocks.

OPERATING TEMPERATURE

0° to +66° C (+32° to +150° F)

WEIGHT

10 ounces (283 grams)

DIMENSIONS

Refer to Dimensions drawing

WIRING

Wiring from the inductive sensor to the Oscillator-

Demodulator may be achieved with a KW01009 cable and an

MS3102A-14S-6P (K04183) Bulkhead Connector or other

comparable equipment. All wiring from the Oscillator-

Demodulator to the amplifier is point-to point and should be

supplied by the customer. Two typical wiring schemes are

illustrated in Wiring Diagrams 1 and 2.

TROUBLE SHOOTING

If the mobile control system malfunctions, isolate the module

whithin the system that has failed. f the KE02901, 2 proves

to be the problem source, use a VOM to check the following

typical voltages.

1. Pins A to B should read 1.4 Vac.

2. Pins C to D and E to F should read from 2.8 to 5.3 Vac.

3. Pins M to P should read 2 Vdc.

4. Pins L to H should read 12 Vdc.

5. Pins J to N should read .08 Vdc per percent slope error.

6. Pins J to N should read 3 Vdc ahen the KE02901, 2 is

used with the KE0550X Amplifier.

7. Pins J to H and N to H should read 3 Vdc when the

sensor is leveled and the KE02901, 2 is used with the

ACE100A Controller.

BLN-95-8938-5

WIRING DIAGRAM 2

388A

KE02901 Wiring Diagram Employing an ACE100A Controller in a Proportional Slope Control System.

KE02901 Wiring Diagram Employing KE05501 Amplifier in a Solenoid Valve Slope Control System.

387B

WIRING DIAGRAM 1

CUSTOMER SERVICE

NORTH AMERICA

ORDER FROM

Danfoss (US) Company

Customer Service Department

3500 Annapolis Lane North

Minneapolis, Minnesota 55447

Phone: (763) 509-2084

Fax: (763) 559-0108

DEVICE REPAIR

For devices in need of repair or evaluation, include a

description of the problem and what work you believe

needs to be done, along with your name, address and

telephone number.

RETURN TO

Danfoss (US) Company

Return Goods Department

3500 Annapolis Lane North

Minneapolis, Minnesota 55447

EUROPE

ORDER FROM

Danfoss (Neumünster) GmbH & Co.

Order Entry Department

Krokamp 35

Postfach 2460

D-24531 Neumünster

Germany

Phone: 49-4321-8710

Fax: 49-4321-871-184

Danfoss KE02901, 2 Oscillator-Demodulator Installation guide

Danfoss KE02901, 2 Oscillator-Demodulator Installation guide

Danfoss KE02901, 2 Oscillator-Demodulator Installation guide

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