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1.16
Element Wattage/Amperage Calculation Charts
Use the charts below when changing voltages or determining amperage for a given element
configuration.
Three Phase
To determine Three Phase Amperage, solve for
Single Phase first:
Wattage
= Single Phase Amps
Voltage
Then divide the Single Phase Amperage by 1.73 to
determine Three Phase Amperage.
Example:
17,000W
70.833 Amps
=
240V
1.73
= 40.944 Amps per Phase
1.17 Troubleshooting
1.17.1 Control and Heating Problems
Problem
Controller won't
activate.
L1
Amperage
L2
L3
Probable Causes
A. Power cord is not plugged in or circuit
breaker is tripped.
B. Controller has failed.
C. Power
supply
temperature control board has failed.
To compute the New Wattage Rating of an element if a
different voltage is applied, use the following formula:
2
[
]
New Voltage
Old Voltage
= New Wattage Rating
Example:
If 208V supply is applied to a 17 kW element
rated for 240V, the calculation is as follows:
[
]
208V
240V
= 12.77 kW
A. Plug power cord in and verify that
circuit breaker is not tripped.
B. If available, substitute a controller
known to be working for the
suspect controller. If the substitute
controller functions correctly, order
a new controller.
C. If any of the components in the
power supply system (including the
component
or
transformer and temperature control
board) fail, power will not be
supplied to the controller and it will
not function.
1-10
L1
Three Phase
Wattage
L2
L3
kW Listed
X
2
17,000 Watts
X
Corrective Action
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