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Multi-Amp CB-832 Instruction Manual

High current test set
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Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)

INSTRUCTION MANUAL

For
HIGH CURRENT TEST SET
MODEL CB-832
It is essential that this instruction book be read thoroughly before putting the equipment in service.
Part
12470
Rev. 2 3/25/99

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Summary of Contents for Multi-Amp CB-832

  • Page 1: Instruction Manual

    ® Advanced Test Equipment Rentals www.atecorp.com 800-404-ATEC (2832) INSTRUCTION MANUAL HIGH CURRENT TEST SET MODEL CB-832 It is essential that this instruction book be read thoroughly before putting the equipment in service. Part 12470 Rev. 2 3/25/99...
  • Page 2 AMP Corporation. The equipment described herein may be protected by one or more U.S. letters patent. MULTI-AMP specifically reserves to itself all rights to such proprietary information as well as all rights under any such patent, none of which is waived by the submission of this instruction manual to anyone.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION PAGE INTRODUCTION ......................1 Specifications ....................Bulletin General Information ....................1 About This Manual ....................1 Safety Precautions ....................2 THEORY OF OPERATION ....................3 Description of Controls ..................3 Selection of Output Terminal ................6 Selection of Output Leads ..................

  • Page 4: Introduction

    INTRODUCTION GENERAL INFORMATION The Multi-Amp Model CB-832 is a self-contained test set which incorporates a variable high current output and appropriate control circuitry and instrumentation for testing thermal , magnetic, or solid- state motor overload relays, molded-case circuit breakers and ground fault trip devices.

  • Page 5: Safety Precautions

    WARNING The Model CB-832 is not designed for use on energized circuits. For the safety of the operator and protection of the instrument, do not connect it to circuits that are energized. This includes circuits that could become energized during the course of a test procedure utilizing this instrument.

  • Page 6: Theory Of Operation

    This section of the instruction manual describes the functions of all the various control switches, etc. which are located on the control panel of the Model CB-832. All controls are clearly marked and logically grouped so that continual reference to the instruction manual should not be necessary after the operator has become acquainted with the operation of the test set.
  • Page 7 OUTPUT MODE Switch Initiates the output circuit in conjunction with the appropriate Timer STOP MODE Switch position. MOMENTARY Momentary on position with spring return to OFF. Output will remain energized as long as switch is held in MOMENTARY position and is de-energized when released. Timer starts and stops in the same manner.
  • Page 8 CYCLES Position The timer counts in whole The timer counts in two selectable increments and uses an internal cycles and uses the power 10kHz oscillator as timing reference. input line frequency as timing reference.SEC. Position .01/.001 Switch Selects one of two counting increments available for the timer SEC. mode.

  • Page 9: Selection Of Output Terminal

    SELECTION OF OUTPUT TERMINAL Three output terminals at various voltage and current ratings are provided to adapt the CB-832 to a wide variety of test circuit impedances. The Multi-Amp Model CB-832 circuit breaker test set has three current output terminals to provide a wide range of current-voltage capabilities.
  • Page 10 Model CB-832 is rated at 1.75 kVA output and is equipped with three output terminals, each capable of supplying its rated current. The current rating of these output terminals may be exceeded for short durations provided the voltage rating is sufficient to "push" the desired current through the device under test and the connecting test leads.

  • Page 11: Test Procedures

    approximately 1000 amperes. Higher currents are usually available from the terminal rated 500 amperes; HOWEVER, these higher currents are available only for very short durations as illustrated in the overload capacity table above. For example, it is possible to get 1800 amperes from this terminal through a typical 225 ampere molded case circuit breaker for an instantaneous trip test.
  • Page 12 Thermal melting alloy or solder pot Thermal bimetallic strip Electromagnetic In thermal type relays, time-current characteristics are obtained by the thermal properties of the melting alloy or bimetallic strip. In the magnetic type, a damped plunger or moving iron device is used to produce time delays.

  • Page 13: Planned Maintenance Program

    common type of magnetic overload relay utilizes a plunger or iron core piston which extends from an oil filled dashpot into the operating coil of the relay. When the electromagnetic field produced by the operating coil is strong enough, the piston moves through the oil and opens the contacts of the relay.

  • Page 14: Time Delay

    Heat Damage Curve of the motor be used as a guide for maximum trip time at 300% of motor full load current. TIME DELAY OF MOTOR OVERLOAD RELAYS TIME DELAY Set-up CB-832 with: POWER ON/OFF Switch in OFF position (instrument displays off). OUTPUT CONTROL knob at minimum `0' position.

  • Page 15: Instantaneous Element

    "preheat" the relay by running rated current through the relay for a few minutes. INSTANTANEOUS ELEMENT Set-up CB-832 with: POWER ON/OFF Switch in OFF position. OUTPUT CONTROL knob at minimum, `0' position.
  • Page 16 Connect one end of a high-current lead to one side of instantaneous element in overload relay. Connect other end of this lead to the COMMON terminal of test set. Connect one end of second high-current lead to other side of instantaneous element in overload relay.
  • Page 17 When overload relay trips, timer stops and output is de-energized. Current reading is retained on ammeter. Timer indicates elapsed time in seconds or cycles. Turn test set OFF with POWER ON/OFF Switch. Record results. IMPORTANT Refer to manufacturer's instructions for instantaneous trip time. If increasing test current does not decrease tripping time, current at which minimum tripping time was first observed is the instantaneous trip current value.

  • Page 18: Maintenance Of Molded Case Circuit Breakers

    MAINTENANCE OF MOLDED CASE CIRCUIT BREAKERS The molded case circuit breaker essentially consists of two separate elements. One element is a set of contacts and suitable mechanical linkage for manual operation of the breaker as a switch in an electrical circuit. The other element is a device that senses and reacts to an overload or short circuit. Normally, the time delay overload device is thermal and the instantaneous overload device, when supplied, is magnetic.
  • Page 19 Set-up CB-832 with: POWER ON/OFF Switch in OFF position (instrument displays OFF). OUTPUT CONTROL knob at minimum, `0' position. OUTPUT MODE Switch in center OFF position. Connect one end of a high-current lead to one pole of circuit breaker. Connect the other end of this lead to the COMMON terminal of test set.

  • Page 20: Instantaneous Element

    Some types of circuit breakers are intended to trip only under high current fault condition, usually ten times (10x) rated current. They have only instantaneous characteristics and therefore will not trip using usual procedure described above. INSTANTANEOUS ELEMENT Set-up CB-832 with: Part 12470 Rev. 2 3/25/99...
  • Page 21 POWER ON/OFF Switch in OFF position. (instrument displays OFF) OUTPUT CONTROL knob at minimum, `0' position. OUTPUT MODE Switch in center OFF position. Connect one end of high-current lead to one pole circuit breaker. Connect the other end of this lead to the COMMON terminal of test set. Connect one end of second high-current lead to the other side of the same pole of the circuit breaker.

  • Page 22: Ground Fault Element

    (can cause premature wear-down of the brush(es) and carbon buildup - see SERVICE DATA). GROUND FAULT ELEMENT Set-up CB-832 with: POWER ON/OFF Switch in OFF position. (instrument displays OFF) OUTPUT CONTROL knob at minimum, `0' position.

  • Page 23: Part

    MODE Switch in MOMENTARY and release. Observe current reading retained on ammeter. Continue to rotate OUTPUT CONTROL knob clockwise while jogging (repeatedly moving to MOMENTARY position and releasing) OUTPUT MODE Switch until desired test current is reached. Suggested test current is one and one half times (1.5 x) the rating of the ground fault trip device.

  • Page 24: Service Data

    SECTION IV SERVICE DATA The test set utilizes straightforward circuits and components which require little or no service except for routine cleaning, tightening of connections, etc. The test set should be serviced in a clean atmosphere away from energized electrical circuits. The following maintenance is recommended: Maintenance intervals depend on usage, but a maximum of every six months is recommended.

  • Page 25: Service And Repair Order Instructions

    Other Components: Check all knobs, printed circuit boards, screws, fasteners, connections and terminals for tightness and proper position. Remove dust with a soft brush and breath of air. Output terminal connection tightness is particularly important. If they become loose, excessive heating of the terminals and poor current output will result.

  • Page 26: Preparation For Reshipment

    If damage or malfunction is suspected or repairs deemed necessary, consult a Multi-Amp Corporation Representative for assistance if it is unclear what course of action is needed. Please provide model and serial number when making inquiries. Pack the equipment appropriately to prevent damage during shipment. If a reusable crate or container is used, the unit will be returned in it if the container is in suitable condition.
  • Page 27 Current output test circuit is open. Fuse F2 has failed. CT is open or CT circuit connector has come loose at the printed circuit board (PCB). Power on, no instruments lighted: Power ON/OFF Switch (CB1) has failed. Fuse F1 has failed. Power supply assembly or RF1 filter has failed.

  • Page 28: Warranty

    Multi-Amp Corporation. Multi-Amp Corporation will, at its option, either repair or replace those parts and/or materials that it deems to be defective. Any costs incurred by the purchaser for the repair or replacement of such parts and/or materials shall be the sole responsibility of the original purchaser.

  • Page 29: Schematics

    SECTION V SCHEMATICS Part 12470 Rev. 2 3/25/99...

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