220v/1ph/50hz is needed for the interlock function limit stwich in the sectional motor(Even though the sectional door motor is 380/3/50, the interlock limit switch is always 220/1/50).
For this reason, the contactor in the dock leveler control box need to be changed.(For dock leveler 380v/3ph/50hz without interlock function, the contactor coil is 380v, but for dock leveler 380v/3ph/50hz with interlock function, the contactor coil should be 220v).
So, what you need to do to achieve the interlock function between HL7 dock leveler and Insul-Rite 6000 door is:
• Replace contactor.
• Change the wiring according to the attached electric diagram.