78 PWR-01
Variable Internal Resistance function
The variable internal resistance function enables you to easily simulate rechargeable batter-
ies, solar batteries, fuel cells, and other power supplies that have internal resistance. By set-
ting the internal resistance value in constant voltage (CV) mode, you can decrease the output
voltage according to the output current.
The variable internal resistance function can be configured only in constant voltage (CV)
mode.
Use CONFIG parameter CF03 to set the internal resistance. If you are not using the variable
internal resistance function, select off (factory default setting, CF03: OFF). VIR lights when
the variable internal resistance function is set.
If the output voltage falls to or below 3 % of the rated voltage, the output voltage may not be
stable. If the difference between the voltage setting and the output voltage (voltage drop due
to internal resistance) is less than 20 % of the rated voltage, the accuracy of the resistance
setting degrades.
It cannot handle transient operation (variation).
Setting range
Vrtg: rated output voltage, Irtg: rated output current, Rint: internal resistance
0 <Rint (min) ≤Rint (max)
L type, ML type: Rint (max)= Vrtg/ Irtg
MH type, H type: Rint (max)= Vrtg/ Irtg x 3/4
The maximum internal resistance that can be set during parallel operation is the value
obtained by dividing Rint (max) during standalone operation by the number of units in parallel
operation. The resolution is the value obtained by dividing the resolution during standalone
operation by the number of units in parallel operation.
PWR401L PWR401ML PWR401MH PWR401H
Vrtg [V] 40 80 240 650
Irtg [A] 40 20 5 1.85
Rint [Ω] 0.001 to 1.000 0.001 to 4.000 0.01 to 36.00 0.1 to 263.5
Resolution
1
1 Resolution when FINE is in use
0.001 0.001 0.01 0.1
PWR801L PWR801ML PWR801MH PWR801H
Vrtg [V] 40 80 240 650
Irtg [A] 80 40 10 3.7
Rint [Ω] 0.001 to 0.500 0.001 to 2.000 0.01 to 18.00 0.1 to 131.8
Resolution
*1
0.001 0.001 0.01 0.1
PWR1201L PWR1201ML PWR1201MH PWR1201H
Vrtg [V] 40 80 240 650
Irtg [A] 120 60 15 5.55
Rint [Ω] 0.001 to 0.333 0.001 to 1.333 0.01 to 12.00 0.1 to 87.84
Resolution
*1
0.001 0.001 0.01 0.01
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