munirabbasi Posted November 21, 2020 Share Posted November 21, 2020 Hello World Hercules Fuel & Avionic Expertise! All 14 fuel tanks electrical pumps are operated by 3 phase power supply , controlled through 3 phase (4 poles) SWs mounted on OH Fuel control & management panel, where others Aircraft, AC pumps are controlled remotely by single wire (single pole) SWs through 3 phase relays. what is reason behind it? Best Regards Munir Abbasi Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 28, 2020 Author Share Posted November 28, 2020 On 11/21/2020 at 7:53 PM, munirabbasi said: Hello World Hercules Fuel & Avionic Expertise! All 14 fuel tanks electrical pumps are operated by 3 phase power supply , controlled through 3 phase (4 poles) SWs mounted on OH Fuel control & management panel, where others Aircraft, AC pumps are controlled remotely by single wire (single pole) SWs through 3 phase relays. what is reason behind it? Best Regards Munir Abbasi Home of Hercules Pakistan Hello World Hercules Fuel & Avionic Expertise! All 14 fuel tanks electrical pumps are operated by 3 phase power supply , controlled through 3 phase (4 poles) SWs mounted on OH Fuel control & management panel, where others pumps like hydraulic ,prop feathering AUX pump , ACS recirculating fan , are controlled remotely by single wire (single pole) SWs through 3 phase relays. what is reason behind it? Best Regards Munir Abbasi Munir Abbasi Home of Hercules Pakistan Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted December 2, 2020 Share Posted December 2, 2020 On 11/21/2020 at 8:53 AM, munirabbasi said: Hello World Hercules Fuel & Avionic Expertise! All 14 fuel tanks electrical pumps are operated by 3 phase power supply , controlled through 3 phase (4 poles) SWs mounted on OH Fuel control & management panel, where others Aircraft, AC pumps are controlled remotely by single wire (single pole) SWs through 3 phase relays. what is reason behind it? Best Regards Munir Abbasi Home of Hercules Pakistan The pumps are connected to multiple power sources (and wire routing) so one set of wires accomplishes a simple control input to the pump regardless of power source. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 3, 2020 Author Share Posted December 3, 2020 13 hours ago, NATOPS1 said: The pumps are connected to multiple power sources (and wire routing) so one set of wires accomplishes a simple control input to the pump regardless of power source. Thanks for response Best Regards Munir Abbasi Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
n1dp Posted December 3, 2020 Share Posted December 3, 2020 Had to think about this for a while. I remember sitting in the Engineer's seat for many hours pondering the design of electrical systems. The simplicity of the three phase overhead fuel panel switch allows for control even if DC busses are lost. Something you would loose if you used DC power to control a power relay. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 3, 2020 Author Share Posted December 3, 2020 1 hour ago, n1dp said: Had to think about this for a while. I remember sitting in the Engineer's seat for many hours pondering the design of electrical systems. The simplicity of the three phase overhead fuel panel switch allows for control even if DC busses are lost. Something you would loose if you used DC power to control a power relay. Sir David I do not agree with you all three phase ESS AC services (PUMPS) are controlled remotely, Except No.2 Fuel Tank pump. Munir Abbasi Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
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