ITech IT7900P Series User Manual page 91

Programming the load value (CP)
The user can press [Set] and set the input resistance value in the main interface
of CP 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.
7.3.4 Constant Apparent Power Mode (CS)
In the constant apparent power mode, the constant power is required for the
electronic load, and the current sinks according to the set apparent power, as
shown below. If the input voltage increases, the input current will decrease to
keep the power S (=V * I) at the set value.
Input
Voltage
Select CS mode
Press [Config] and enter to the configuration menu. Select constant mode to
CS.
Under the config menu interface, the user can select Const Mode item and set
the mode to CS.
⚫
⚫
V
Set power value
V2
V3
I2
Load Current
Voltage-current Relation of CS Mode
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.
Copyright ©ITECH Electronic Co., Ltd.
I3
I
Load mode Operation
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