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Appendix C Power Allocation
96 Series N6700 User’s Guide
Power Limit Operation
Mainframe Power Limit
If the combined power drawn from all of the power modules exceeds
the mainframe’s power rating, a power fault protection event will
occur. This causes ALL outputs to turn off and remain off until a
protection clear command is given. This is explained in chapter 4
under “Clear Output Protection Functions”. A status bit (PF) will
indicate that a power fault protection event has occurred.
The power allocation function lets you programmatically limit the
power that can be sourced from individual power modules, thereby
preventing the combined power from exceeding the mainframe’s
rated output power and causing all the outputs to turn off.
NOTE
For N6702A mainframes operating at 100-120 VAC nominal, the sum of the
channel power limit settings cannot exceed 600W due to a restriction on the
AC line current. There is no restriction when operating at 200-240 VAC nominal.
Module Power Limit
When the power limit has been set to a value less than the maximum
rating on a power module, and either the output voltage or the output
current increases to a point where the module exceeds the power
limit setting, the module’s power limit function will activate. If the
power limit is left at the maximum rating, then the power module
will not enable its power limit function.
On Agilent N673xA, N674xA, N675xA, and N676xA power modules,
the power limit function will limit the output power at its
programmed setting. A status bit (CP+) will indicate that the output
is in power limit mode. When the power drawn by the load is reduced
below the power limit setting, the output automatically returns to
normal operation - either constant voltage or constant current mode.
On Agilent N673xB, N674xB, and N677xA power modules, the
power limit function will turn the output off after a power limit
condition persists for about 1 millisecond. A status bit (CP+) will
indicate that the output has been turned off because of a power limit
condition. To restore the output, you must first adjust the load so
that it draws less power. Then you must clear the protection function
as explained in chapter 4 under “Clear Output Protection Functions”.
Note that on these models, it may be preferable for some applications
to use the current or voltage setting to limit the output power so as to
avoid turning the output off.
NOTE
Power limiting should not be used when Agilent N673xB, N674xB, and N677xA
power modules are grouped. When these power modules are grouped, you
must reset the power limit to its maximum rated value.