72-900-06 Rev. F
Page 9 of 38
RELAY BOARD CONNECTIONS
Energy Usage and Duty
The unit utilizes a variety of probes and input signals to control valves, pumps,
and numerous other devices. These items are not all used in a continuous
fashion. The typical unit has a complicated duty cycle dependent on application.
For 120V and a max of 8A, a typical duty cycle of 15 minutes on and 45 minutes
off can be used. This results in an energy calculation of
120V * 8A *Power Factor* 25%
The Power Factor is the cosine of the phase angle between the Current and
Voltage of an AC circuit. Typically, 0.8 is a good estimate for US power.
The 25% is the estimate of a typical duty cycle of 15 on and 45 off.
For 240V, the amperage remains constant.
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