Power Management Control Rack
A purpose-designed control panel manages the AC power to the UPS modules and detects the output status from each UPS. When being powered from the UPS – when the output of the first UPS module becomes unusable, the second UPS will take over and an alarm will be raised on the HMCS (and Back-up Panel).
An additional redundancy feature of the system is that there is a separate AC power feed to the rack from each vessel switchgear room (Port & Starboard). This ensures that there will always be AC power available at the input to the rack – from one source or the other.
If the online input power supply should fail, the Supervisor (or Technician) will turn the AC power input selector switch to the remaining (healthy) AC input.