AXIOMET AX-EL300W60A [32/72] Protection function

3.14. Protection Function

3.14.0.

The electronic load is equipped with the following protection functions:

- Overvoltage (OV)

- Overcurrent (OC)

- Overpower (OP)

- Overtemperature (OT)

- Reverse Voltage (RV)

Once any of the above protection functions is active, the corresponding status bit in the status will be set;

the input will be turned off with beeps; the annunciator of “Cancel” will be turned on, the display will

show PT to indicate protection status the detected conditions will be displayed; the load will enter into

the latched protection status, and will not respond to other commands except some specific operations.

For example: if an overtemperature conditions has been detected, the input will be turned off with beeps,

and OT will be shown in the lower right corner of the display. The load will have no response to other

operations.

3.14.1. Clearing Latched Protection

When the load enters into the latched protection status, it will have no response to other commands. The

load will return to the normal operation only when the latched protection has been reset via long pressing

the “Cancel” key or the remote command (INPut:PROTection:CLEar). Of course, the condition that cause

the latched protection must be removed, or it will be latched again as soon as it is reset.

In addition, when the software overcurrent protection is enabled, if the overcurrent time does not exceed

the specified protection time, the indicator of “Cancel” will be turned on, but the input will not be turned

off. At this time, you can reset the overcurrent time via long-pressing “Cancel” key or the remote command

(INPut:PROTection:CLEar).

3.14.2. Over Voltage

When the input voltage exceeds the predetermined voltage, the overvoltage protection will be enabled, and

the input is turned off with OVP displayed, meanwhile, the OV and VF status register bits are set, and will

remain set until they are reset and overvoltage condition is removed.

3.14.3. Over Current

The electronic load allows the user to define a current protection limit. When the defined current limit is

exceeded, the overcurrent timer starts timing, and the indicator of “Cancel” will be turned on, but the input

will not be turned off immediately. When the specified delay time is reached, the overcurrent protection

will be enabled and the input is turned off with OCP displayed, meanwhile, the OC and PS status register

bits are set, and will remain set until they are reset and overcurrent condition is removed. The current

protection limit function can only be set via the entry key from the front panel and the remote command.

It is turned on/off with the command (CURRent:PROTection:STATe ON/OFF). The current limit level is