Riley & Associates, Inc.

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Monorail Control Products

JNF-076 POWER SUPPLY BOARD

 OVERVIEW

The JNF-076 board is a dual precision 5, 12, 15, or 24 volt power supply. It is designed for use as both a power supply for the TRAK DRIVE (tm ) boards or as a precision supply for powering the command rail in a analog system. The two supplies are isolated from each other so that one may be used in an electrically noisy environment while the other is used to power a device that will not tolerate noise. It also was designed to power Electro's ultrasonic sonar board. It has dual primaries allowing operation from either 110 or 220 V.A.C. and has an AGC style fuse block which is brought out to its own terminals allowing it to be used to fuse other devices.

INPUTS

L1, L2, L3, L4

L1,2 and L3,4 are each 110 V.A.C. inputs. They are wired in parallel for 110 volt operation and in series for 220 volts. They may be used as an auto transformer as long as the imbalance between the two windings does not exceed 50ma. Input power should be 110 or 220 V.A.C. +-10%, the supply draws .2A at 110 V.A.C. and .1A at 220 V.A.C.

 F1, F2

These terminals are for an optional AGC type fuse holder that is on the board.

OUTPUTS

OUT1, OUT2

These two outputs are each rated as follows;

5 V.D.C. 12 V.D.C. 15 V.D.C. 24 V.D.C.
1 AMP .5 AMP .5 AMP .4 AMP

The outputs are +-5% standard but may be ordered trimmed to +-1%. They may be trimmed in the field by a technician. Fauver stocks the 12 volt version of this supply, all others are special orders.

POWER DISSIPATION

Power dissipation varies between the different voltages. The worst case for each is;

5 V.D.C. 12 V.D.C. 15 V.D.C. 24 V.D.C.
12.3 WATTS 6.2 WATTS 6.2 WATTS 5.0 WATTS

SIZE

This board is designed to fit a 4 inch snap track. It is 6 inches wide and rated for 50 degrees C.

PROCEDURE FOR TRIMMING POWER SUPPLY

STEP 1 - Read output voltage.

STEP 2 - Temporarily lift Bit 1 resistor ( R8 for supply #1 or R14 for supply #2. Read the output voltage again and subtract the new voltage from the value obtained in step one.

STEP 3 - Subtract the required voltage from the value obtained in step one and divide that voltage by the value obtained in step 2. Round the result off to the nearest whole number, this is your binary value.

STEP 4 - Revering to the chart below, clip resistors based on the binary value you calculated in step 3. Replace R8 or R14 if necessary.

STEP 5 - Verify that the output voltage is trimmed to +-1%

TRIM CHART

BINARY VALUE OUT 1 OUT 2
1 R8 R14
2 R7 R13
4 R6 R12
8 R5 R11
16 R4 R10

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Page last revised 10-7-97

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SATURN

Ronald J. Riley
1323 West Cook Road
Grand Blanc, MI 48439
Phone (810) 655-8830 - Fax (810) 655-8832
E-mail: rjriley@rjriley.com

Home Page: http://www.rjriley.com/