User Manual

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8.5.15 Overcurrent Protection (OCP)
The electronic load includes both hardware and software overcurrent protection features.
“Hardware OCP” - The electronic load’s maximum input current will be limited to approximately 110% of the current
range. Once the hardware OCP is triggered, the status register’s OC bit will be set. When the hardware OCP is removed,
the status register’s OC bit will be reset. Hardware overcurrent protection will not aect the electronic load’s input on/o
state.
“Software OCP” - Users can set the electronic load’s software OCP value with the following steps.
1. Go to “CONFIG” menu and select “Protect”. Then press .
2. Select “A-limit” and press .
3. To enable software OCP, select “On” and press . The default is “O”.
4. If enabled (ON), the load will prompt to enter a value for “Point”. Use the numeric keypad or rotary knob to enter
the OCP current limit value, then press . The valid range depends on the model of the load.
5. It will then prompt to enter a value for “Delay”. This is the protection trip delay, which is the amount of time to
delay from when the input has reached the limit before triggering
OCP. Use the numeric keypad or rotary knob to enter a value, then press to conrm change. The valid range is 0
– 60 seconds.
NOTE:
Software OCP will disable the input if the input current has reached or exceeded the protection limits.
Operations to Clear the OCP State
Check whether the input current is within the electronic load’s rated current or the programmed protection current ranges.
If it is outside the range, disconnect the device under test. Then press any key on the front panel or remotely send SCPI
command PROTection:CLEar. The OCP displayed on the front panel will turn o and the load exits OCP protection
state.
To start an OCP test,press “[ ]+ []”
name:
images/triggerButton
file:
images/triggerButton
state:
unknown
.
Press “[ ]+ [ CC ]” (OCP) to enter OCP operation.
EDIT OCP TEST
1. VON LEVEL=0.000V: - Set Voltage threshold
2. VON DELAY=0.00S - After delay certain time,the DC load starts to draw current.
3. RANGE=3.000A - Set current range
4. START=0.1000A - Set start current
5. STEP=0.1000A - Set step current
6. STEP DEL=0.20S - Set delay time of each step
7. END=2.0000A - Set end current
8. OCP VOLT=2.000V - Set OVP value
9. MAX TRIP =1.5000A - Upper limit of OCP value
10. MIN TRIP=0.9000A - Lower limit of OCP value
11. SAVE OCP FILE=1 - Save OCP test le (1-10)
Set the power on mode to be OCP test mode: