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Marathon Electric
MaraGlobe 500kVA 440V 60Hz
The Marathon MaraGlobe 500 kVA is a marine‑rated diesel generator/alternator delivering 440 V at 60 Hz, designed for auxiliary power on medium‑size vessels.
Inspector Detail
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Common issues
- Bearing wear/failure causing increased vibration and noise
- Insulation resistance degradation from moisture ingress or condensation during idle standby periods
- AVR (automatic voltage regulator) fault causing voltage instability or failure to excite
- Winding contamination from oil mist or salt-laden air reducing insulation resistance
- Space heater failure allowing condensation buildup during standby
- Terminal box connection loosening from vibration, causing localised heating
- Rotating rectifier/diode failure in the brushless exciter assembly
Inspection checklist
- Insulation resistance (megger) test of stator and rotor windings, with polarization index if due
- Check space heater operation during shutdown periods
- Inspect and grease/replace bearings per manufacturer's schedule; check for abnormal noise or vibration
- Inspect AVR wiring and connections; verify voltage regulation on load
- Check terminal box connections for tightness and signs of overheating
- Inspect the rotating rectifier/diode assembly for burnt or failed diodes
- Check air filters/screens and cooling air path for cleanliness
- Verify earth/ground connections and continuity
- Load test and check voltage/frequency stability across the load range
Service intervals
| Insulation resistance test | every 3-6 months, and before any extended lay-up |
| Bearing grease replenishment/replacement | per manufacturer's schedule - confirm exact figure against the manufacturer manual |
| AVR and protection function test | annually |
| Full winding inspection/overhaul | condition-based, typically around every 5 years |
Typical wear limits
| Insulation resistance | assess against the machine's own baseline trend rather than a single absolute figure - confirm minimum acceptable value against class/manufacturer's criteria |
| Bearing vibration | assess against trend/baseline rather than a fixed limit without manufacturer's vibration criteria for this frame size |
| Terminal connection torque | per manufacturer's torque spec - re-inspect on any sign of overheating discolouration |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- AVR (automatic voltage regulator) unit
- Bearings, drive end and non-drive end (correct manufacturer's type)
- Rotating rectifier diode set
- Space heater element
- Terminal box connectors/hardware
Safety
- High voltage/current at terminals - lock out and verify de-energised and discharged before opening the terminal box
- Rotating machinery hazard - secure coupling/guard before maintenance
- Loose connections causing overheated windings are a fire risk - torque terminal connections correctly
- Never bypass or defeat protective relays (overcurrent, reverse power, earth fault) to keep a generator running
Class survey
Auxiliary generators fall under machinery/electrical survey requirements - class checks insulation resistance records, protective relay function tests and generator/prime mover load tests at periodic and annual survey.
Estimated lifetime:
This entry's specifications carry a needs-verification flag from a general reference catalogue rather than a confirmed manufacturer's datasheet, so no lifetime hours figure is given - obtain confirmed technical data from Marathon Electric or the vessel's generator documentation before using this for maintenance planning
Components & Design
Component data being added…
Technical Data
power kva
500
frequency hz
60
poles
4
enclosure
IP23
insulation class
H
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Equipment Model #82600
· ✓ still in production