Electrical Flashcards
What component provides connection between the No. 1 and the No. 2 DC primary buses?
K202 Realy
Where is the #1 battery junction box located?
Avionics nose tunnel in front of #2 FCC computer
What components energize the No. 1 converter line contactor K101 and No. 2 converter line contactor K201?
1 & #2 converters energize the K101 and K201
Power to energize the K502 relay comes from what bus?
1 or #2 DC BATT Utility Buss via the battery switches through de-energized K102 and K203’s.
With a #2 Converter failure, turning off the #2 Battery switch would cause what to occur?
lose power to DC ESS Buss and DC Batt buss
What are the three ways we use to produce power in the UH-60M?
Magnetism (Generators), Chemical (Batteries), Heat (Thermocouple Harness)
What do we use in the UH-60M to change AC to DC power?
Convertors
What type of circuit provides the same voltage to all its customers?
a Parallel circuit
What relay will cause the battery low light to illuminate?
K300
What current limiter protects the #2 battery from a short to ground fault between the battery and the battery junction box?
CL 84
How long will the batteries provide uninterrupted emergency power in flight?
12 Min (IETM)
(Approximately 80% charged)
15 Min (-10)
What is the general description of the APU generator?
115/200 VAC Brushless air cooled 3 phase 400hz
What functions do the GCU’s provide and at what threshold do they provide them?
Under frequency 370-380HZ
Under voltage 100 +/- 5
Over voltage 124-126 (or 125 +/-1)
Feeder fault
Current and voltage regulation
Describe the primary flow of power from the ac primary bus to the AC REF bus.
1 side: Through the #1 AC primary bus through the #1 AUTO XFMR CB through T115 through energized K13.
What is the flow of power to the ac reference bus if you are at 100% and you turn the #1 Generator off and the APU Generator is off-line?
Same as Question #3 except power from the #1 side is now being supplied through CL 1,2,3 from K2.
Where are the T115 and T12 autotransformers located?
T115 is located between the Main Transmission and IVHMU box. T12 located in #1 junction box
What relay does the Ext Pwr. switch energize?
K4
What faults does the main Generator Control Unit monitor?
Over voltage
under voltage
feeder fault
under frequency
What component controls when K101 and K201 energizes?
The current sensors reading 5-7AMPS
What component controls when K501 and K503 energizes?
Battery Switches
What relay provides a signal to the R/H relay panel to cause the depressurization valve on the Backup HYD pump to activate for 4 seconds?
K4
What functions does the right hand landing gear WOW control?
Generator under frequency and external stores jettison
