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FIELD ADJUSTMENT PROCEDURE

10-0020 POWER SUPPLY

DOCUMENT # 90-0020-005-1.0

INTRODUCTION

This procedure describes how to adjust the 10-0020 Power Supply Assembly. For best results, adjust the supply in the field after installation, with the load that will ultimately be applied. Factory adjustments should provide an acceptable starting point. Overvoltage protection circuitry will protect the COMPUTROL equipment from damage which could otherwise occur.

 

RELATED DOCUMENTS

There are no other documents required to perform this procedure.

 

EQUIPMENT REQUIRED

Item No. Quantity Description
1. (1) Power Supply to be adjusted, installed
2. (1) 3˝ digit digital Multi-meter (Fluke 8024B or equivalent) with appropriate test leads
3. (1) Small flat insulated screwdriver or non-conducting adjusting tool

 

TEST SETUP

CAUTION:  The Power Supply contains a load resistor to guarantee that output 1 will supply a minimum of 10% of its maximum load current. This resistor can cause the chassis to become hot after a short period of operation. Please exercise caution when handling the power supply.

 

  1. Ensure that the Power Supply is securely installed, that all connections to the external terminal block are made, and that they are tight and secure. Visually inspect the area for possible short circuits before applying power to the equipment.
     
  2. Power on the equipment.
     
  3. Measure all voltages at the Card Cage terminal block.
     
  4. Set the meter to a suitable mode and scale to measure 5 to 15 volts DC.

 

ADJUSTMENT PROCEDURE

  1. Connect the positive lead of the meter to the terminal marked +5V on the card cage barrier block. Connect the negative lead of the meter to the adjacent GND terminal.

  2. Verify that the meter reads between 4.90 and 5.10 volts DC. If the reading is outside this range, then perform the adjustment outlined in step 3. Otherwise, proceed with step 4.

  3. Adjust the potentiometer marked “V1 ADJ” until the meter reads between 4.90 and 5.10 volts DC. If the adjustment cannot be made, then the power supply is defective and must be repaired.

  4. Connect the positive lead of the meter to the terminal marked -15V on the card cage barrier block. Connect the negative lead of the meter to the adjacent GND terminal.

  5. Since this output is not adjustable, make note of the reading. It should be between -15.30 and -14.70 volts DC.
  6. Connect the positive lead of the meter to the terminal marked +15V on the card cage barrier block. Connect the negative lead of the meter to the adjacent GND terminal.

  7. Verify that the meter reads between 14.70 and 15.30 volts DC. If the reading is outside this range, then perform the adjustment outlined in step 8. Otherwise, proceed with step 9.

  8. Adjust the potentiometer marked “V2 ADJ” until the voltage reading has the same absolute value as the reading noted in step 5. If the adjustment cannot be made, then the power supply is defective and must be repaired.

  9. Disconnect the meter leads.

 

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Revised: .