AUXILIARY POWER UNIT DIAGNOSTIC TOOL
First Claim
1. An auxiliary power unit with diagnostic facilities, comprising:
- an alternating current generator having a direct current exciter winding and an output winding;
an automatic voltage regulator for maintaining control over an excitation voltage applied across the direct current exciter winding responsive to sensed voltage across the output winding; and
a plurality of multimeters including multimeters providing readings for the voltage applied across the direct current excitation winding and the sensed voltage and resistance measurements for the direct current excitation winding and the output winding.
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Accused Products
Abstract
A diagnostic tool for an auxiliary power unit comprising an alternating current generator having an exciter winding and an output winding and an automatic voltage regulator for providing control over the excitation winding of the generator includes a harness with plug connectors allowing the diagnostic tool to be directly introduced between the generator and automatic voltage regulator replacing the conventional connections without affecting operation of the auxiliary power unit. The diagnostic tool has a plurality of multimeters between the automatic voltage regulator and the alternating current generator providing voltage readings across and resistance readings for the generator'"'"'s stator exciter winding and main and auxiliary output windings. A protocol relates voltage and resistance readings taken with the multimeters when the auxiliary power unit is on and off to possible faults in the generator or with the automatic voltage regulator.
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Citations
10 Claims
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1. An auxiliary power unit with diagnostic facilities, comprising:
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an alternating current generator having a direct current exciter winding and an output winding; an automatic voltage regulator for maintaining control over an excitation voltage applied across the direct current exciter winding responsive to sensed voltage across the output winding; and a plurality of multimeters including multimeters providing readings for the voltage applied across the direct current excitation winding and the sensed voltage and resistance measurements for the direct current excitation winding and the output winding. - View Dependent Claims (2, 3, 4, 5)
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6. A diagnostic tool for an auxiliary power unit comprising an alternating current generator having an exciter winding and an output winding and an automatic voltage regulator for providing control over the excitation winding of the generator, the diagnostic tool comprising:
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wiring allowing connection of each of a plurality of multimeters between the automatic voltage regulator and the alternating current generator; a plurality of multimeters including multimeters providing readings for voltage applied across the exciter winding and sensed voltage appearing across the output winding and resistances of the windings; and means for relating voltage and resistance readings taken with the multimeters to faults in the generator or with the automatic voltage regulator. - View Dependent Claims (7, 8, 9, 10)
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Specification