SPX Cooling Technologies HP7000 - Manual (Page 8)

DENSITY
A
= Actual Air Density
VOLTS
N
= Nameplate Volts
AMPS
N
= Nameplate Amperage
HP
N
= Nameplate Horsepower
HP
C
= Corrected Horse-
power
VOLTS
A
= Actual Volts
AMPS
A
= Actual Amperage
VOLTS
A
× AMPS
A
× DENSI-
TY
D
HP
C
= × HP
N
assembly identification number (see Figure 1) is required to identify
a replacement hub assembly or repair components. Please provide
the Marley sales representative the necessary information when
ordering replacement fans or components.
Blades can be replaced without rebalancing the entire fan.
If rebalancing is desired, contact the Marley sales representative in
your area.
Motor Load
The corrected horsepower should be close to but not exceed the
contract horsepower specified. Determine corrected horsepower
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).
Measurements taken on motors operating with Variable Fre-
quency 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.
Note
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In the interest of technological progress, all products are subject to design and/or material change without notice
©2005 SPX Cooling Technologies, Inc. | Printed in USA
Balcke | Hamon Dry Cooling | Marley
Cooling Technologies