Xantrex HPD 15-20, Operating Manual

Page: 35 / 42

Release 2.2
33
Section 4. Operation
Introduction
Once you have installed the power supply and have connected both the AC input
power and the load as covered in
Section 2 Installation , the power supply is ready to
operate.
•
Operating Modes , below, offers a brief explanation of Constant Voltage and
Constant Current Mode operation.
• “Connecting Multiple Supplies in Series (Voltage Mode Only)” on page 35 ,
covers using multiple supplies.
Operating Modes
Your power supply has two basic operating modes: Constant Voltage Mode and
Constant Current Mode. The mode in which the power supply operates at any given
time depends on the combination of:
•
output voltage setting V
SET
• output current limit setting I
SET
• resistance or impedance of the attached load R
L
Figure 4.1 represents the relationships between these variables.
Figure 4.1 Operating Modes
Output
Current
Output
Voltage
Crossover Point
Constant Current
Mode Region
O
V SET
I SET
O
Constant Voltage
Mode Region
Where:
R
L
= Load Resistance
V
SET
= Output Voltage Setting
I
SET
= Output Current Setting
R
L
=
V
SET
I
SET
R
L
<
V
SET
I
SET
R
L
>
V
SET
I
SET