3 Normal Operation
3-1
3
Normal Operation
3-1 Description of Operation Modes
The RE Series power supply units are provided with two operation modes (constant voltage and
constant current modes) and two control modes (local and remote modes).
This section describes the constant voltage and constant current modes in the local modes.
The operation mode is determined by the following:
・
Output voltage setting
V
set
・
Output current setting
I
set
・
Load resistance
R
L
3-1-1 Constant Voltage Mode
The power supply unit operates in the constant voltage mode when the load current
I
L
is less
than the current setting
I
set
(
I
L
<
I
set
;
I
L
=
V
set
/
R
L
).
In the constant voltage mode, the voltage is constant at the set value (
V
set
) and the load current
I
L
changes according to the load.
When using the power supply unit in the constant voltage mode, turn the current setting knob
clockwise all the way to the maximum or ensure that it is set to the required current, which
allows setting to the desired voltage.
3-1-2 Constant Current Mode
The power supply unit operates in the constant current mode when the load resistance is low
enough to make the load current
I
L
more than the current setting (
I
L
>
I
set
). In the constant
current mode, the current is constant at the set value (
I
set
) and the load voltage changes
according to the load.
R
L
= Load resistance
V
set
= Output voltage setting
I
set
= Output current setting
3-1-3 Crossover Mode
The automatic crossover system functions to automatically switch between the modes as the
load response changes. For example, the mode is changed from the constant voltage to
constant current when the load current exceeds the current setting. The mode is brought back
to the constant voltage when the resistance becomes high enough.
Output voltage
V
set
Constant voltage range
R
L
＞
R
L
＜
I
set
Output current
Crossover point
Constant current range
0
R
L
＝
V
set
I
set
V
set
I
set
V
set
I
set
[Figure] Operation mode
