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Section 3. Operation
Overvoltage Protection (OVP)
Release 1.0 23
Overvoltage Protection (OVP)
The OVP circuit is designed to protect the load in the event of a remote programming
error, incorrect voltage control adjustment, or power supply failure. The protection
circuit monitors the output and reduces the output voltage and current to zero
whenever a preset voltage limit is exceeded. A red LED on the front panel indicates
when the OVP circuit has been activated. Set the OVP trip level at the front panel.
OVP Flag When the OVP has been activated, a signal of nominal +10V through 10k will be
present at pin J5-1. When no OVP condition exists, this signal will be 0V.
Setting the
OVP Trip
Level
1. Turn the power supply OFF.
2. Insert a small, flat-bladed screwdriver through the OVP ADJ (OVP Adjust) hole
in the front panel to turn the adjusting screw fully clockwise (one-turn screw).
3. Turn the unit ON and set the output to the desired trip voltage.
4. Slowly turn the adjusting screw counterclockwise until the red OVP indicator
lamp lights.
5. Turn the POWER switch to OFF.
6. Turn the voltage control knob to minimum.
7. Turn the POWER switch back ON and increase the voltage to check that the
power supply shuts off the output at the set voltage. Reference to J5 connector
pin 6 (auxiliary ground).
8. Reset the OVP circuit after activation by removing the overvoltage condition
and powering the unit OFF and back ON, or, by momentarily activating the TTL
remote shut down circuit. See “TTL Shutdown” for information about shut
down circuit operation.