Appendix C Power Allocation
110 Keysight 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.
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.
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 Keysight 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.
On Keysight 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.
Power limiting should not be used when Keysight 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.
For Keysight Models N678xA SMU
, the power limit function does not
apply.
To Next Page
Loading...
Need help?
General
