PF = Power-fail protection detects ac line disturbances that might cause a malfunction. If an ac line
disturbance occurs, the unit goes into a latched protection state. PF protection is always enabled.
PROT = The output is disabled by a protection event
EDP = Excessive dynamic protection protects the instrument from damage in the event of over-
switching (switching frequency >50 kHz), excessive large repetitive voltage swings (or oscillation), and
persistent pulse-width modulator current saturation. When tripped, the unit will go into a latched
protection. EDP should not engage under normal conditions. EDP protection is always enabled.
INH = The Inhibit input (pin 3) on the rear panel digital connector can be programmed to act as an
external shutdown signal. Refer to Inhibit Input for details.
LFP = A Leader/Follower Protection fault has occurred in the paralleled group. All outputs of all
paralleled units are disabled. LFPis always enabled.
LIM_PROT = Limit Protection indicates the output is disabled by high limit protection; which is
triggered when the output operates in high limit for longer than the specified maximum duration.
LIM_PROT- = Limit Protection - indicates the output is disabled by low limit protection; which is
triggered when the output operates in low limit for longer than the specified maximum duration.
UV = Under-voltage protection is a user-programmable function that can be enabled or disabled.
When enabled, it provides an under-voltage shutdown that prevents the output voltage from going
below the programmed setting. If the voltage measured at the remote sense leads falls below the
programmed under-voltage level, the unit will go into a latched protection state.
OCF = An internal over-current fault has occurred which caused a latched protection fault.
LOV = An internal over-voltage fault has occurred which caused a latched protection fault.
DOV = An externally applied over-voltage fault has occurred which caused a latched protection fault.
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. A negative OVP
shutdown will occur if the + and – sense leads are accidentally reversed.
Note that you can specify a delay to prevent momentary over-voltage excursions from tripping the
over-voltage protection. Delay values can range from 10 microseconds to 65 milliseconds.
SCPI Command
To set the OVP level to 120 volts:
VOLT:PROT 120, (@1)
To enter a delay value of 10 ms:
VOLT:PROT:DEL 0.01, (@1)
Keysight MP4300 Series Operating and Service Guide 87
4 Using the Modular Power System
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