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Current limiting schemes
Issuing the OUT 0 command, globally disables the outputs of all the Power Modules.
Turning the output on or off
Use the OUT <ch>,1 command to turn on the output of a specific Power Module.
Not that only if the other conditions mentioned at the top of this section are met then the
Power Module's output will be activated.
Use the OUT <ch>,0 command to turn off the output of a specific Power Module.
Polarity and
Each XMP 2600 Power Module has two sets of output relays: disconnect and polarity
reversal.
disconnect
relays
Disconnect relays
The output disconnect relays are operated using the DISC <ch>,<mode> command,
where <mode> can be either 1 for disconnect or 0 for connect.
Polarity reversal relays
The output polarity reversal relays are operated using the POL <ch>,<mode> command,
where <mode> can be either 1 for negative or 0 for positive.
Auto polarity
The auto-polarity programming feature allows for the output voltage settings to be
programmed as either a positive or a negative value.
When auto polarity is enabled, the polarity of the programmed Vset value automatically
controls the state of the polarity reversal relays.
While auto polarity is enabled and the polarity of the corresponding output is reversed,
voltage readback values have a minus sign preceding them.
To enable auto polarity, issue the POLEN 1 command.
To disable auto polarity, issue the POLEN 0 command.
Current limiting schemes
The Power Modules of the XMP 2600 have 5 different output current limiting schemes.
The following sections describe each of those schemes.
The output current limiting scheme is selected using the FOLD <ch>,<mode> command,
where mode can have a value between 0 and 4.
Voltage /
This output current limiting scheme, selected using
mode = 0 (FOLD <ch>,0), instructs the Power Module to
current mode
operate as either a voltage source or a current source with
automatic switching between the two modes of operation.
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.
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.
20
XMP 2600 Programming Manual
Basic Programming
V
Vset
rev. 1.1
operating
range
I
Iset
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