Agilent Technologies N6700 manual Power Limit Operation, Mainframe Power Limit, Module Power Limit

Appendix C Power Allocation

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
NOTE
	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.
	Power limiting should not be used when Agilent N673xB, N674xB, and N677xA
NOTE
	power modules are grouped. When these power modules are grouped, you
	must reset the power limit to its maximum rated value.

96 Series N6700 User’s Guide