Sens NRG24-20 Specifications download pdf (Page 39)

PROTOTYPE TEST SUPPORT (PTS)

60 HZ TEST SUMMARY

GENERATOR SET MODELS REPRESENTATIVE PROTOTYPE

350DFEG

400DFEH

450DFEJ

500DFEK

The following summarizes prototype testing conducted on the designated representative prototype of the specified models.

This testing is conducted to verify the complete generator set electrical and mechanical design integrity. Prototype testing is

conducted only on generator sets not sold as new equipment.

Maximum Surge Power:

516

Maximum Motor Starting:

kVA

2429

The generator set was tested to simulate motor starting by

applying the specified kVA load at low lagging power factor

(0.4 or lower). With this load applied, the generator set

recovered to a minimum of 90% rated voltage.

Torsional Analysis and Testing:

The generator set was tested to verify that the design is not

subjected to harmful torsional stresses in excess of 5000 psi.

A spectrum analysis of the transducer output was conducted

over the speed range of 1200 to 2000 RPM.

Cooling System:

ºC Ambient50

in. H2O restriction0.5

The cooling system was tested to determine ambient

temperature and static restriction capabilities. The test was

performed at full rated load in elevated ambient temperature

under static restriction conditions.

Durability:

Steady State Performance:

The generator set was tested to verify steady state operating

performance was within the specified maximum limits.

Voltage Regulation:

Random Voltage Variation:

Frequency Regulation:

Random Frequency Variation:

Transient Performance:

The generator set was tested with the standard alternator to

verify single step loading capability as required by NFPA 110

and verify acceptable voltage and frequency response on

load addition or rejection. The following results were

recorded:

Full Load Acceptance:

Voltage Dip:

Recovery Time:

Frequency Dip:

Recovery Time:

Full Load Rejection:

Voltage Rise:

Recovery Time:

Frequency Rise:

Recovery Time:

Harmonic Analysis:

(per MIL-STD-705B, Method 601.4)

Harmonic No Load Full LOad No Load Full Load

Line to Line Line to Neutral

Electrical and Mechanical Strength:

The generator set was tested to several single phase and

three phase faults to verify that the generator can safely

withstand the forces associated with short circuit conditions.

The generator set was capable of producing full rated output

at the conclusion of the testing.

Model:

Engine:

Alternator:

QSX15-G9

HC5F

500DFEK

0.044

2.5

1.1

0.066

0.72

0.3

0.012

0.026

2.1

0.58

0.014

0.77

0.235

0.18

0.104

0.38

0.42

0.033

0.74

0.25

0.02

0.1

0.36

0.42

0.74

0.2

%32.1

Second3.4

%10.8

Second4

%16.3

Second0.9

0.6 Second

%0.5

%0.3

Isochronous

0.25

The generator set was subjected to a minimum 500 hour

endurance test operating at varialbe load up to the standby

rating based upon MIL-STD-705 to verify structural soundness

and durability of the design.

The generator set was evaluated to determine the stated

maximum surge power.

Cummins Power Generation

Specification May Change Without Notice PTS-145B

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Sens NRG24-20 Specifications Page 39

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