24-34-00 STANDBY DC POWER Back
A. System Function
The standby dc power system supplies 24 V dc to keep the Attitude and the Heading Reference System (AHRS) in operation when the engines are started from the internal batteries. The system also supplies 24 V dc to the coil of some relays in the Power Distribution Units (PDU) during some power failure conditions.
B. System Components
The primary components of the system are the:
The standby dc power system supplies 24 V dc to keep the Attitude and the Heading Reference System (AHRS) in operation when the engines are started from the internal batteries. The system also supplies 24 V dc to the coil of some relays in the Power Distribution Units (PDU) during some power failure conditions.
B. System Components
The primary components of the system are the:
- Emergency Power-supply Unit (EPSU) (Ref. Fig. 2)
- Test switch (Ref. Fig. 1)
- Test relay
- Standby battery busbar
C. System Operation (Ref. Fig. 3)
The system supplies 24 V dc to the standby battery busbar. This is through the EPSU relay and the LEFY or the RIGHT BATT switches (Ref. 24-30-00).
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