National Instruments RMX-4120 User Manual page 46

• When the load or the RMX programmable power supply is malfunctioning.
Set the OVP and OCP trip points to appropriate values. Immediately after you purchase the
RMX programmable power supply or immediately after a load is changed, you have to set the
OVP and OCP trip points to values that are appropriate for the load.
The OVP2 trip point is fixed to 120% of the rated output voltage.
OVP2 Trip Point
Setting the OVP and OCP Trip Points and the Detection Time of OCP Activation
OVP will trigger based on the voltage at the output terminals of the power supply. If you want
to activate the protection function according to the voltage across the load, take the voltage drop
in the load cable into consideration when you set the OVP trip point.
You can use the CONFIG settings to set the detection time of the OCP activation (CF13)
1. Press OCP•OVP.
The OCP•OVP key LED lights up, and the OVP trip point and OCP trip point are displayed
in the display area.
2. While viewing the panel display, turn the VOLTAGE knob to set the OVP trip point or the
CURRENT knob to set the OCP trip point.
OVP setting range: 10% to 112% of the rated output voltage
OCP setting range: 10% to 112% of the rated output current
OVP Setting
OCP Setting 750 W
OCP Setting 1500 W
3. Press OCP•OVP twice to finalize the settings.
RMX-4120/
RMX-4124
36 V
Figure 2-17. OVP and OCP Trip Point Displays
OCP trip point
RMX-4120/
RMX-4124
3 to 33.6 V
7.5 to 84 A
15 to 168 A
RMX Programmable Power Supplies User Manual
RMX-4121/
RMX-4125
96 V
OVP trip point
Lit
RMX-4121/
RMX-4125
8 to 89.6 V 23 to 257.6 V
2.8 to 31.36 A
5.6 to 62.72 A
RMX-4122/ RMX-4123/
RMX-4126 RMX-4127
276 V
RMX-4122/ RMX-4123/
RMX-4126 RMX-4127
65 to 728 V
1 to 11.2 A 0.35 to 3.92 A
2 to 22.4 A 0.7 to 7.84 A
© National Instruments | 2-15
780 V