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Selecting a current limiting scheme Basic operation
Setting
protection
thresholds
manually
To manually control the protection threshold settings you need to make sure the
setting method is set to manual (shown as “MAN”). See: Selecting the protection
setting method, above, if you need to change the setting method.
Once the setting method is set to manual, you can program the voltage (OVP) and
current (OCP) protection thresholds the same way you program any other voltage or
current parameter value. See: Programming power module parameters at the
beginning of this chapter
OVP and OCP thresholds must be set above the corresponding Vset
and Iset values.
Selecting a current limiting scheme
The XMP 2600 Power Modules have five different output current limiting schemes.
The output current limiting scheme is selected when programming output settings
using the SET parameter.
Available
current
limiting
schemes
The five current limiting schemes, divided into four categories, are explained in the
following sections.
Voltage / current mode
This output current limiting scheme instructs the
Power Module to operate as either a voltage source or
a current source with automatic switching between the
two modes of operation.
V
I
operating
range
Vset
This, default mode, is the most commonly used output
current limiting scheme. The window workpoint
warning feature can be used in combination with this
output current limiting scheme to give you a more tight
control over the load’s behavior.
Iset
Foldback
Foldback is an output current limiting scheme in which both output voltage and
output current are reduced when the Power Module is operating as a current source
(current limitation is active).
There are two types of output foldback to choose from: linear and non-linear.
Linear foldback
When the linear output foldback mode of
operation is selected, as the output current of
the Power Module reaches its limiting value,
output voltage and output current are reduced
(depending on the characteristics of the
connected load) down to 0 volts and 30% of the
set current (for an output short-circuit).
operating
range
Iset
V
Vset
I
52 XMP 2600 User’s Guide rev. 1.0