CE certificated,RoHS compliant. Automatic Constant Feed Speed Control: Automatic output voltage adjustment in real time to ensure constant preset feed speed regardless of weight change of the workpieces. Automatic Frequency Adjustment: Automatic output frequency adjustment in real time to make sure the load is always working at its resonant frequency. Automatic Resonant Frequency Search: Search out and output resonant frequency of the load. other related parameters are also set automatically Counting: Count number of the workpieces. The controller will slow down or stop when count up to preset value. (available on SDVC34MRJ) Rs485 Communication: All parameters of the controller can be adjusted via R485. Automatic Switch Sensor Type Recognition: The controller can recognize and adapt to both PNP and NPN type switch sensors Sync Output: Sync output waveform of the slave controller with that of the master controller to the same frequency and phase to avoid beat effect Overvoltage Protection: If input voltage is too high, power supply of the controller will be shutdown automatically to protect itself. Digital Overheat Protection: If internal temperature of the controller gets too high, the controller will stop its output to protect itself. Overcurrent Protection: If output current exceeds its rated value he controller will stop its output to protect itself and the load. Restorable Short Circuit Protection: If output of the controller is short-circuited, the controller will shut down its output to protect itself and the load. But the fuse inside will not be blown. So when there is no short circuit at the output side, the controller will work again after power on.