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Advanced Features
Load protection
The events enable masks
Registered Power Module's events can be enabled to seep in thru the status structure
(using the CESE command) up to the main status byte and the SRQ generation
mechanism (use the *SRE command to set the events that will generate an SRQ).
Using these events-enable masks and monitoring service requests generated by the XMP
2600 relieves the governing software from routinely checking the XMP's or Power
Module's status.
When an SRQ event occurs, the governing software should traverse the status structure
and learn of the events that caused the SRQ to be generated. Use the guidelines in the
"Handling SRQ and the IEEE488.2 Status Structures" section.
Additional usages
Combining the window warning mechanism with the shutdown on non-fault events
feature (described in the following sections) enables you to establish Under Voltage and
Under Current protection thresholds.
Load protection
The XMP 2600 and its Power Modules incorporate several mechanisms that serve to
protect the connected loads. The following paragraphs detail those protection mechanisms
and the way to use them.
OVP
Over Voltage and Over Current Protection are threshold values that are set above a Power
Module's output settings values.
and
OCP
The OVP and OCP mechanisms protect the load against malfunctions in the XMP 2600
and abnormal conditions on the distribution lines.
Setting (and using) the OVP and OCP mechanisms is explained in the Basic
Programming chapter.
Once a protection event (fault) occurs, the Power Module tries to shutdown its output. If
the Power Module is not successful in shutting down its output it will shutdown the
primary (main converter).
Note that shutting down the main converter causes all the Power Modules in the
mainframe to be shutdown. See the section on Selective Shutdown for instructions on
how to shutdown other Power Modules when a fault occurs.
Current
The five current limitation schemes, described in the Basic Programming chapter, protect
the load from drawing too much current.
limitation
The two foldback modes of current limiting restrict the amount of current delivered to the
load once it tries to consume an excessive amount of current, offering a low short circuit
current.
The retry current limitation scheme works best with a load that is reset once power is
removed from its input.
The shutdown mode current limiting is to be used with very sensitive loads – the output
of the Power Module is shutdown as soon as the load draws too much current.
Protection
The XMP 2600 can be instructed to treat workpoint window warnings as though they
were faults (see selective shutdown, below).
using the
workpoint
Utilizing this feature gives you 4 new protection thresholds: high voltage, high current,
low voltage and low current.
window
XMP 2600 Programming Manual
25
rev. 1.1
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