Ac Load Simulation -- Constant Power Mode; Both - Chroma 63800 Series Operation & Programming Manual

Programmable AC/DC Electronic Load 63800 Series Operation & Programming Manual
3.8

AC Load Simulation -- Constant Power Mode

In CP mode, the Load will sink a current according to the programmed power. This mode is
operated under the firmware calculation. That is, take the measured V data, divide the Power
setting and get the I setting value.
The waveform of the current is programmed as a sinusoidal wave synchronized by the
zero-crossing waveform of input voltage. The values of the PF and CF can be programmed in
CP mode as well as in CC mode.
In this mode, there are CF only, PF only and BOTH for selection. The following is only focused
on the BOTH mode to describe, others about the setting methods of CF only and PF only
please refers section 3.6.2 and 3.6.3. CP mode can be set by pressing CP key. Users can
press the arrow key to select the setting parameters on the LCD display, including current
Power value, CF, PF, and I
If the voltage is drawn to 0V under CP mode, it will trigger the warning of
Load Fail (LDF). Meanwhile, the loading for the load will be stopped.
WARNING
When LDF warning is triggered then press power switch to restart AC
load. If AC load can not function normally after restarting, please contact
Chroma sales or service office.
The output voltage of UUT will distort because of loading current. If the
output voltage of the UUT becomes distortion and drops below 10V due to
the loading, the AC load will stop the loading.

3.8.1 BOTH

The default value in CP mode is the BOTH mode.
To switch from other modes to BOTH mode, its setting methods are as follows.
1. Press CONF./LOCAL key.
2. Press 1 , then press ENTER to enter SETUP.
3-24
I
Load
Current
Input Voltage
Figure 3-9 Constant Power Mode
(max).
p
Power setting
P = V * I
V