... down, over speed, over load and over current b) Operation display: i) Unit voltage, tri-phase load current and frequency display ii ... cleaner h) On-board control panel i) MCCB air conservation switch j) 12 / 24V starting accumulator and Battery line k) ... for heat exchanger, Control system communication interface, Battery charger by main supply, Fuel-water separator, Daily fuel tank, ATS & paralleling ...