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Operating the Power System 4
Series N6700 User’s Guide 59
Using the Protection Functions
Each output has independent protection functions. A front panel
status indicator will turn on when a protection function has been set.
Protection functions are latching, which means that they must be
cleared once they have been set. As explained under “Couple Output
Protection” you can configure the instrument so that when a
protection fault occurs on one output, ALL outputs will be turned off.
Of the following protection functions, only OV, OC, PROT, and INH
are user- programmable.
OV
Over-voltage protection is a hardware OVP whose trip level is a programmable value.
The OVP is always enabled.
OC
Over-current protection is a programmable function that can be enabled or disabled.
When enabled, the output will be disabled when the output current teaches the
current limit setting.
OT
Over-temperature protection monitors the temperature of each output and shuts
down the output if any temperature exceeds the maximum factory-defined limits.
PF
PF indicates that a power fail condition on the AC mains has disabled the output.
CP+
CP+ indicates that a positive current limit condition has disabled the output. This
protection function does not apply to all power modules. Refer to Appendix C for
further information.
PROT
Prot indicates that the output is disabled because of a coupled protection signal from
another output.
INH
The Inhibit input (pin 3) on the rear panel digital connector can be programmed to
act as an external shutdown signal. Refer to Appendix B for further information.
Set the Over-Voltage Protection
The over-voltage protection function turns off the affected output if
the output voltage reaches the programmed over-voltage limit.
Front Panel: SCPI Command:
Select Protect\OVP.
Enter a value in the OVP level box
and press Select.
To set the OVP level for outputs 1 and
2 to 10 V:
VOLT:PROT 10,(@1,2)
Set the Over-Current Protection
When over-current protection is enabled, the power system turns off
the output if the output current reaches the current limit setting and
transitions from CV to CC mode.
Front Panel: SCPI Command:
Select Protect\OCP.
Check Enable OCP and press Select.
To enable OCP for outputs 1 and 2:
CURR:PROT:STAT 1,(@1,2)