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AVO CB-845X Instruction Manual

Circuit breaker test set
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INSTRUCTION MANUAL
For
CIRCUIT BREAKER
TEST SET
MODEL CB-845X
It is essential that this instruction book be read thoroughly before putting the
Part _ S/O 81892
Rev. 0

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Summary of Contents for AVO CB-845X

  • Page 1 INSTRUCTION MANUAL CIRCUIT BREAKER TEST SET MODEL CB-845X It is essential that this instruction book be read thoroughly before putting the Part _ S/O 81892 Rev. 0...
  • Page 2 IMPORTANT The information and data contained within this instruction manual are proprietary with AVO MULTI-AMP Corporation. The equipment described herein may be protected by one or more U.S. letters patent. AVO 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

    Copyright AVO MULTI-AMP Corporation, 1993 TABLE OF CONTENTS General Information Page General Description Common Test Applications Specifications Description of Features Operational Safety Input Circuit Selection of Input Leads Output Circuit Selection of Output Leads Overload Capacity Test Procedures Time Delay Test - Motor Overload Relays...
  • Page 4 SRO Instructions CB-845X Parts List Warranty Statement Part _ S/O 81892 Rev. 0...

  • Page 5: General Description

    GENERAL DESCRIPTION The Multi-Amp Model CB-845X Circuit Breaker Test Set is a self-contained unit which provides a continuously adjustable high current output and incorporates a digital ammeter, digital timer and control circuitry. The test set consists of two units housed in interlocking, stackable, rugged, metal enclosures.
  • Page 6 reading after one complete cycle. Normal: Continually updates ammeter reading as current changes. Timer: A solid-state crystal controlled digital timer with 0.3" (7.62 mm) LED 5 digit display. Seconds Mode: Ranges: 0-99.999 seconds 0-999.99 seconds Accuracy: + .005% of reading + 1 digit Cycles Mode: Range: 0-99999 cycles...
  • Page 7 Control Unit - Height: 11 1/4 inches Width: 21 inches Depth: 17 1/2 inches Output Unit - Height: 11 1/4 inches Width: 21 inches Depth: 19 1/2 inches Part _ S/O 81892 Rev. 0...

  • Page 8: Description Of Features

    Two No.22 timer leads each 5 feet (1.5 m) long. These leads are used to connect the binding posts on the CB-845X labeled CONTACTS to the contacts of the device under test which will open or close when the device operates. Two No. 4 high current leads, each 5 feet (1.5 m) long and two No.
  • Page 9 OUTPUT CONTROL: Variable autotransformer provides continuous non- stepped output from a variety of current terminals. Output system is controlled by a combination of timer STOP MODE and OUTPUT MODE Switch positions. AMMETER: LED display shows the numeral one in the left-most digit when the meter is over-ranged.
  • Page 10 NORM. CLOSED: With CONTACTS binding posts connected to normally closed external contacts, output will remain energized and timer will continue to run until contacts open. CURRENT: Timer will initiate only when output circuit is completed and threshold current of approximately 8% of full scale of ammeter range selected is exceeded.

  • Page 11: Operational Safety

    INPUT CIRCUIT INPUT VOLTAGE: The Multi-Amp CB-845X Circuit Breaker Test Set is designed to operate on a single phase 208 or 240 volt input. The selector switch on the front of the unit is used to select the input voltage tap that matches either 208 or 240 volt power supply available.
  • Page 12 test set. Although the test sets are designed to operate satisfactorily at 95-105% of rated voltage, any drop in voltage below RATED at the input terminals will result in a proportional decrease in the maximum available output. Part _ S/O 81892 Rev.

  • Page 13: Selection Of Input Leads

    NOTE: To achieve published output currents, the rated input voltage must be maintained at the test set terminals during the test. GROUNDING: A grounding terminal is provided in the input plug to match that provided in the input socket. A properly connected ground wire contained in the input cable selected should be connected to a properly grounded power supply receptacle.

  • Page 14: Output Circuit

    The wire sizes in this chart will result in voltage drops of ten volts or less. OUTPUT CIRCUIT Seven high current output terminals are provided on the Model CB-845X output unit to supply a continuously adjustable output current for a wide variety of test circuit current requirements.

  • Page 15: Selection Of Output Leads

    OVERLOAD CAPACITY Model CB-845X is rated at 5.5 kVA output and has two output terminals capable of supplying rated current. The current rating of these output terminals may be exceeded for short durations provided the voltage is sufficient to "push" the desired current through the device under test and the connecting test leads.

  • Page 16: Test Procedures

    TEST PROCEDURES FOR MOTOR OVERLOAD RELAYS TIME DELAY Set-up CB-845X 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. Proper INPUT VOLTAGE selected. Connect one end of a high-current lead to one side of thermal element or current coil in overload relay.
  • Page 17 "preheat" the relay by running rated current through the relay for a few minutes. INSTANTANEOUS ELEMENT Set-up CB-845X with: Power ON/OFF Switch in OFF position (instrument displays off). OUTPUT CONTROL Knob at minimum "0" position.
  • Page 18 element in overload relay. Connect other end of this lead to the common terminal (see SELECTION OF OUTPUT LEADS, page Error! Bookmark not defined.). Connect test set to suitable single-phase power supply. Turn test set ON with POWER ON/OFF Switch (instrument displays should light).
  • Page 19 IMPORTANT NOTE Refer to the 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. Part _ S/O 81892 Rev. 0...
  • Page 20 TEST PROCEDURES FOR MOLDED CASE CIRCUIT BREAKERS THERMAL ELEMENT Set-up CB-845X 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. Proper INPUT VOLTAGE selected. Connect one end of a high-current lead to one pole of side of circuit breaker.
  • Page 21 Refer to INSTANTANEOUS TEST PROCEDURES FOR MOLDED CASE CIRCUIT BREAKERS. INSTANTANEOUS ELEMENT Set-up CB-845X 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.
  • Page 22 GROUND FAULT TRIP Set-up CB-845X with: Power ON/OFF Switch in OFF position (instrument displays off). OUTPUT CONTROL Knob at minimum "0" position.
  • Page 23 Proper INPUT VOLTAGE selected. Connect one end of a high-current lead to one pole of side of circuit breaker. Connect other end of this lead to the appropriate high current output terminal of test set. Connect one end of second high-current lead to other side of same pole of circuit breaker.
  • Page 24 Turn test set OFF with POWER ON/OFF Switch. IMPORTANT NOTE Refer to the manufacturer's instructions for proper test current value and tripping time. Part _ S/O 81892 Rev. 0...

  • Page 25: 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 electric circuit. The other element is a device to sense and react to an overload or short circuit.

  • Page 26: Maintenance Of Motor Overload Relays

    MAINTENANCE OF MOTOR OVERLOAD RELAYS APPLICATION The prime function of the motor overload relay is to prevent operation of a motor for too long when an overload condition exists. In general, motor starters are applied to a given horsepower range of motors. The voltage and current requirements of the application will "size"...
  • Page 27 Thermal - melting alloy or solder pot In this type, tripping is the result of heat generated by the motor load current passing through a "heater" in the overload relay. This overload relay consists of a brass shaft which is surrounded by solder. Fixed to one end of the shaft is a small ratchet wheel.
  • Page 28 up point) and their time delay characteristics. Part _ S/O 81892 Rev. 0...
  • Page 29 PLANNED MAINTENANCE PROGRAM A scheduled program for maintenance of motor overload relays consists primarily of "good housekeeping" with visual inspections and electrical tests. A brief outline is given below: Clean All types of motor overload relays should be cleaned periodically to ensure continued, reliable operation.
  • Page 30 CB-845X MAINTENANCE INSTRUCTIONS Maintenance intervals depend on usage, but a maximum of every six months is recommended. WARNING: DO NOT SERVICE UNIT UNLESS IT IS DISCONNECTED FROM ITS POWER SOURCE. Enclosure The enclosure can be cleaned with a soft cloth. If heavily soiled, the cloth can be dampened with an approved cleaning agent that does not attack the finish or leave residue.
  • Page 31 IMPORTANT NOTES Do not use lubricants or solvents of any kind in the test set except as specifically recommended. If damage or malfunction is suspected or repairs deemed necessary, consult at Multi- Amp Corporation Representative for assistance if it is unclear what course of action is needed.
  • Page 32 Put the RA number on the address label of the shipping container for proper identification and faster handling. Part _ S/O 81892 Rev. 0...
  • Page 33 CB-845X PARTS LIST DESCRIPTION PART NO. Connector, 3 wire, 20A receptacle, grounded (for power input) 1297 Circuit Breaker, 2 pole, 30A 250V 9477 Binding post, white Lens, red indicator (output lamp) 8855 Lamp, 24V (output lamp) 8856 Lamp holder, cartridge (output lamp)
  • Page 34 Fuse holder, 1 pole, 600V, HPC (main) Fuse holder, 1 pole, 250V, HKP (control) Assembly, lens, red (timer & ammeter) 9574 Filter, line, 120V 6344 Part _ S/O 81892 Rev. 0...
  • Page 35 CB-845X ACCESSORY KIT P/N 9482 QUANTITY DESCRIPTION PART NO. 1 pair Accessory lead, timer, 2/C #18 AWG 1282 1 each Connector, 3 wire, 20A, plug 1402 1 pair Accessory cable assembly, #4 AWG 2265 1 pair Accessory cable assembly, # 4/0 AWG...
  • Page 36 WARRANTY STATEMENT Multi-Amp Corporation warrants to the original purchaser that the product is free of defects in material and workmanship for a period of one (1) year from date of shipment. This warranty is limited and shall not apply to equipment which has damage, or cause of defect, due to accident, negligence, improper operation, faulty installation by the purchaser, or improper service or repair by any person, company or corporation not authorized by Multi-Amp Corporation.
  • Page 37 INDEX ACCESSORY KIT ........................24 Ammeter .............................1, 3 Memory ..........................1 Normal ..........................1 Ammeter Accuracy ........................1 Ammeter Modes ..........................1 Ammeter Ranges ...........................1 Calibration CLASS N ...........................22 CLASS ONE ........................22 COMMON TEST APPLICATIONS ....................1 CONTACT BINDING POSTS .....................5 CONTROL FUSE ...........................3 CURRENT ............................4 Dimensions ............................2 DISPLAY MODES .........................4 GENERAL DESCRIPTION ......................1...
  • Page 38 OUTPUT CONNECTIONS ......................8 OUTPUT CONTROL ........................3 OUTPUT INDICATING LAMP ....................5 OUTPUT MODE SWITCH ......................5 Output Range ..........................1 OVERLOAD CAPACITY ......................9 PARTS LISTS ..........................23 PLANNED MAINTENANCE PROGRAM MOLDED CASE BREAKER ..................17 MOTOR OVERLOAD RELAYS ..................20 POWER ON/OFF ........................3 Protection ............................2 RANGE SWITCH ..........................4 SAFETY GROUND ........................7 SERVICE AND REPAIR ORDER INSTRUCTIONS ..............22 SPECIFICATIONS ........................1...

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