Motor Load

The corrected horsepower should be close to but not exceed the contract horsepower specified by SPX. Determine corrected horse- power using the following equation.

Actual volts and amperage must be obtained with the fan running and the specified rate of water flowing over the tower after the motor and Geareducer have reached operating temperature (approximately 30 minutes of operation).

 

 

HPC =

VOLTSA × AMPSA × DENSITYD

× HPN

 

 

VOLTSN × AMPSN × DENSITYA

 

 

 

 

HPC

=

Corrected Horsepower

VOLTSN

=

Nameplate Volts

VOLTSA

=

Actual Volts

AMPSN

=

Nameplate Amperage

AMPSA

=

Actual Amperage

HPN

=

Nameplate Horsepower

DENSITYA

=

Actual Air Density

DENSITYD

=

Design Air Density

Measurements taken on motors operating with Variable Fre-

Notequency Drive controls may read up to 15% high from errors in measuring the approximated sine wave. Instruments capable of measuring a squared off wave form accurately should be used for measuring power in this situation.

Do not exceed 30 sec/hour total motor starting time as motor may overheat.

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SPX Cooling Technologies 03-11A user manual Motor Load

03-11A specifications

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