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4 Using the Regenerative Power System
OCF+ Positive over-current fault is active when the DUT applies a reverse voltage to the output
terminals. It minimizes the resulting peak current at the output terminals by comparing the actual
output current to a fixed level of 105% of the unit's rated current. If the current exceeds this level, the
unit will go into a latched protection.
OCF- Negative over-current fault is active in current priority mode, when the DUT applies a voltage to
the output terminals that is greater than the positive current limit setting. It minimizes the resulting
peak current at the output terminals by comparing the actual output current to a fixed level of 105% of
the unit's rated current. If the current exceeds this level, the unit will go into a latched protection.
DOV, LOV, OCF, are only available on units with firmware revision B.04.04.809 and up.
Set the Over-Voltage Protection
The over-voltage protection will turn the output off if the output voltage reaches the programmed
over-voltage limit. The OVP circuit monitors the voltage at the + and – sense terminals. An OVP
shutdown will automatically occur if the + and – sense leads are accidentally shorted to each other.
Front Panel Menu Reference
Select Protect\OVP
Enter a value in the OVP level box. Then press Select.
Set the Over-Current Protection
Enable OCP
With over-current protection enabled, the output turns off when the output current reaches the
current limit setting and transitions from constant voltage (CV) to current limit (CL+ or CL-).
Front Panel Menu Reference
Select Protect\OCP
Check Enable OCP. Then press Select.
Delay OCP
You can specify an OCP delay to prevent momentary output settings, load, and status changes from
tripping the over-current protection. In most cases these momentary conditions would not be
considered an over-current protection fault, and having an OCP condition disable the output when
they occur would be a nuisance. Specifying an OCP delay lets the OCP circuit ignore these momentary
changes during the specified delay period. Once the OCP delay time has expired and the over-current
condition persists, the output will shut down.
The following selections are available to start the over-current delay timer:
Settings Change this starts the over-current delay whenever a command changes the output settings.
It includes changes made by the transient system so that the timer is started at each list step and at
130
SCPI Command
To set the OVP level to 400 volts:
VOLT:PROT 400
SCPI Command
To enable OCP:
CURR:PROT:STAT ON
Keysight RP7900 Series Operating and Service Guide
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