ITech IT7900P Series User Manual page 89

Under the config menu interface, the user can select Const Mode item and set
the mode to CC.
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Programming the load value (CR)
The user can press [Set] and set the input resistance value in the main interface
of CR mode. Directly set the present value through the knob or press numeric
keys to input the value. In case of wrong input by numeric keys, press
to delete the present input.
7.3.3 Constant Power Mode (CP)
In the constant power mode, the constant power is required for the electronic
load, and the current sinks according to the set power, as shown below. If the
input voltage increases, the input current will decrease to keep the power P (=V
* I) at the set value.
Input
Voltage
Const Mode: load mode
Unit PF: Unity power factor
On: enable the UPF mode, at this situation, the current waveform changes
with the voltage waveform and this mode causes power factor to be as close
as possible to unity, useful when the input voltage is non-sinusoidal.
Off: disable the UPF mode, at this situation, the current waveform is not
affected by voltage Waveform, and the current waveform is subject to
defined in the config menu, the actual power factor is affected by voltage
Waveform, current Waveform, and phase shift.
Resistance setting: set resistance value
V
Set power value
V2
V3
I2
Load Current
Voltage-current Relation of CP Mode
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I3
I
Load mode Operation
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