Marathon Electric PANCAKE GENERATOR Installation, Operation And Maintenance Manual
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Marathon Electric PANCAKE GENERATOR Installation, Operation And Maintenance Manual

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PANCAKE GENERATOR
Installation, Operation,
and Maintenance Manual

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Summary of Contents for Marathon Electric PANCAKE GENERATOR

  • Page 1 PANCAKE GENERATOR Installation, Operation, and Maintenance Manual...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ................................2 SAFETY ..................................2 INSTALLATION ................................2 Location/Environment..............................2 Mounting ..................................3 CONNECTION DIAGRAMS ............................. 4 OPERATION ..................................7 Initial Pre-Start Inspection ............................7 Initial Start-Up ................................7 Shut Down Procedures ..............................8 MAINTENANCE ................................8 Routine Maintenance ..............................

  • Page 4: Introduction

    (See generator nameplate) Initial Inspection Your Marathon Pancake generator has been carefully inspected and tested before leaving the factory. However, it is wise to examine the generator before installation. Carefully unpack and examine the unit. If there is any shipping damage, file a damage claim with the shipper or agent immediately.

  • Page 5: Mounting

    Detach main rotor leads from the red and black DO NOT obstruct the generator intake and outlet threaded studs on rectifier assembly (See Figure 2 air passages. on page 9. Provide sufficient air circulation around the set to Remove exciter armature (rotor) mounting bolt from remove engine heat and to provide ample generator center of shaft, marking position of the rotor to aid in cooling.

  • Page 6: Connection Diagrams

    Remount exhaust screen band. Reconnect all incoming power leads as shown on wiring diagram. To reassemble the armature, pull main rotor leads through the holes in the exciter rotor. Replace pot cover or control box cover. DO NOT PINCH ROTOR LEADS. Remove jack support from under engine flywheel housing.
  • Page 7 Three phase, 12 lead generator connections. Note: 12 lead Pancake generators are not broad range voltage machines. The voltages available in a given three phase connection are model specific. Refer to the generator nameplate, or the factory, with the generator model number, for the voltage available from your unit in any of the below listed connections.
  • Page 8 12 LEAD HIGH VOLTAGE (PARALLEL) WYE (STAR) CONNECTION VOLTAGE 60 HZ 12 LEAD HIGH VOLTAGE (SERIES) DELTA CONNECTION VOLTAGE 60 HZ 12 LEAD HIGH VOLTAGE (PARALLEL) DELTA CONNECTION VOLTAGE 60 HZ N.A.

  • Page 9: Operation

    Re-start the set, and again check for voltage balance. If the problem persists, consult the factory. If everything checks good, shut down PANCAKE GENERATORS MAY HAVE VOLTAGE the set and reconnect the AVR. It is recommended PRESENT AT THEIR LEAD TERMINALS WHEN THE that the residual voltage, together with driver rpm, SHAFT IS ROTATING.

  • Page 10: Shut Down Procedures

    The following procedures may be used to effectively dry the unit’s windings: Routine Maintenance Your Marathon Pancake generator has been designed to Electric space heaters can be installed inside the be as reliable and trouble free as is possible. However, generator frame.

  • Page 11: Restoring Residual Magnetism (Flashing The Exciter Field)

    Restoring Residual Magnetism (Flashing the Exciter the diodes contains three “Reverse” stud type diodes. Field) To restore the small amount of residual magnetism The diodes may be tested in the field without removing necessary to begin voltage buildup, connect a 12-volt them from the heat sinks.

  • Page 12: Spare Parts

    The generator speed should be maintained at rated nameplate value during all operating tests. The frequency of the generator depends upon rotative speed. Most AVRs used with our Pancake generators have built in underfrequency protection such that if the speed is reduced more than 5%, the voltage will drop off rather rapidly with further reductions in speed (see AVR Manual).
  • Page 13 AVR protective circuit is operating. Consult AVR manual. AVR inoperative. Adjust or replace AVR. Refer to AVR manual. Open in stator windings. Check for continuity in the windings. Return to factory or take to service shop if open. Defective diodes. Check rectifier assembly (page 9).
  • Page 14 SYMPTOM: GENERATOR PRODUCES FLUCTUATING VOLTAGE (May be indicated by light flicker) CAUSE CHECK AND REMEDY Irregular engine speed. Check engine for malfunction, or load for fluctuation AVR stability. Adjust AVR stability. Refer to AVR manual. Loose terminal or load connections. Make better connection both mechanically and electrically.
  • Page 15 This information should be read together with all other printed information supplied by Marathon Electric. For more information contact: Marathon Electric, Subsidiary of Regal-Beloit Corporation, 100 E. Randolph St., Wausau, WI 54401 Phone: 715-675-3311 or Fax: 715-675-8026...
  • Page 16 Marathon Electric Mfg. Corp. P.O. Box 8003 Wausau, WI 54402-8003 USA Phone: 715.675.3359 Fax: 715.675.8026 www.marathonelectric.com Printed in USA GPN016 05/06 (5538J/500/5-06/FS/BH)

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