The CV and CC mode are not changed such as by pressing the switch button.
PAT-T series switches the two modes depending on the voltage and current set values and how much current draws by the load.
For example, if PAT-T sets to 10 V and 10 A, the output current will be 0 A without a load connected, therefore PAT-T operates in the CV mode of 10 V. With connected the load, if the load current exceeds 10 A, PAT-T automatically switches to the CC mode of 10 A. While the load current is less than 10 A, PAT-T cannot control the current and operates in the CV mode.
