Specifications
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Merlin-150-300c.indd • © 2011 Simplex, Inc. All Rights Reserved. • Printed in the USA. • www.simplexdirect.com
LOAD BANK MANUAL • Merlin 150-300 Load Bank • page 12 of 15
The following calculations are used to
determine the amount of current when
the desired amount of kilowatts is ap-
plied at 1.0 power factor.
3 Ph a s e
1. Multiply the desired amount of kilo-
watts to be applied by 1000.
2. Multiply the operating voltage times
the square root of 3 (1.732)
3. Divide the answer of step #1 by the
answer of step #2.
4. The answer of step #3 is the average
line current with the desired kilowatts
applied at 1.0 power factor.
S i n g l e p h a s e
1. Multiply the desired amount of kilo-
watts to be applied by 1000.
2. Divide the answer of step #1 by the
operating voltage.
3. The answer of step #2 is the average
line current with the desired amount
of kilowatts applied at 1.0 power fac-
tor.
The following calculations are used to
determine a step kilowatt rating at other
than a rated voltage. This is accom-
plished by referencing the load step to
a KW value at a known voltage.
1. Determine the new unrated operating
voltage.
2. Divide the new operating voltage by
the reference voltage.
3. Square the answer of step #2.
4. Multiply the answer of step #3 times
the reference kilowatt value of the
load step which the new kilowatt
rating is desired.
5. The answer of step #4 is the kilowatt
rating of the load step at the new
voltage.
EXAMPLES
When desired amount of kilowatts is applied at 1.0 PF:
3 Phase
Applied: 50KW Operating Voltage: 480V
Amperage = KW x 1000
Volts x 1.732
= 50 x 1000
480 x 1.732
= 50,000
831.36
= 60.1
Single Phase
Applied: 25KW Operating Voltage: 240V
Amperage = KW x 1000
Volts
= 25 x 1000
240
= 25,000
240
= 104.2
Determining step KW at other than rated voltage:
Applied: 80KW Operating Voltage: 450V
Rated Voltage: 480V
Step KW = (Oper. Volt. ÷ Rated Volt.)
2
x Applied KW
= (450
÷ 480)
2
x 80
= .9375
2
x 80
= 70.3