If the default 0 or blank entry doesn't work, the password was likely changed by the commissioning engineer or the gen-set manufacturer (OEM).
The is a widely respected Automatic Mains Failure (AMF) and genset controller manufactured by Deep Sea Electronics (DSE) . It is a staple in the backup power industry, commonly found controlling single-generator standby applications in data centers, hospitals, commercial buildings, and industrial facilities. intelilite+amf+25+default+password