Ametek Sorensen XFR 100-28, Manual

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Using Over Voltage Protection (OVP)
TM-F2OP-C1XN-01 3-7
Using Over Voltage Protection (OVP)
The OVP circuit protects the load in the event of a remote programming
error, an incorrect voltage control adjustment, or a power supply failure.
The protection circuit monitors the output voltage at the output of the
power supply and will shut down the main power converter whenever a
preset voltage limit is exceeded. Set the preset voltage limit (also called
the set point or trip level) using the screwdriver-adjustable, front panel
OVP potentiometer, or via one of the optional GPIB or RS-232
programming interfaces.
Notes:
1. The default preset limit is approximately 110% of the rated output
voltage.
2. When using OVP with remote sensing lines connected, compensate
for the voltage line drop across the output return line by measuring or
calculating the line drop, then adding this value to the desired OVP
setpoint.
Front Panel OVP Operation
In local control mode, check the OVP set point at any time by pressing the
OVP CHECK switch. The OVP set point is the value displayed on the
digital voltmeter.
To set the trip level from the front panel:
1. Disconnect any loads. Turn the power supply ON.
2. Adjust the power supply output voltage to any voltage lower than the
desired trip level.
3. Press the front panel STANDBY (output shutdown) switch to its IN
position. The red S/D LED
turns on.
4. Press the OVP CHECK switch to see the OVP set point on the
voltmeter display.
5. Holding down the OVP CHECK switch, turn the OVP SET
potentiometer until the desired set point is reached. Release the OVP
CHECK switch.
6. Press the STANDBY switch to its OUT position. The S/D LED turns
off.