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Voltage Regulator Sense Wire Location

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rtitsworth

Joined: 16 Jan 2006
Posts: 76
Location: Detroit, Mi

Posted: Thu Oct 21, 2010 6:07 pm Post subject: Voltage Regulator Sense Wire Location

Bob,



I'm building a 28v Z-14 type dual-battery/dual-bus system with the voltage

regulators on the inside of the firewall and both 24v batteries in the tail

(for weight/balance considerations).



I have 1 LR3C regulator paired with the std Kelly alternator and 1 LS1A

regulator paired with a SD-20 alternator.



I'm curious, where is the "ideal" location to connect the voltage sense wire

(regulator terminal #3) to:

a) Routed back to the battery contactors (i.e. near the batteries)

b) Anywhere on the power bus(es) near the voltage regulators (i.e. inside of

the firewall power bus stud)

c) Through the firewall to the alternator

d) Doesn't really matter (option B for convenience)



I'm assuming I should also set-up/adjust the regulator/alternator output by

measuring the voltage back by the batteries.



Rick

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nuckolls.bob(at)aeroelect
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Posted: Fri Oct 22, 2010 7:25 am Post subject: Voltage Regulator Sense Wire Location

At 09:03 PM 10/21/2010, you wrote:


<rtitsworth2(at)mindspring.com>



Bob,



I'm building a 28v Z-14 type dual-battery/dual-bus system with the voltage

regulators on the inside of the firewall and both 24v batteries in the tail

(for weight/balance considerations).

   What kind of airplane are you building?



I have 1 LR3C regulator paired with the std Kelly alternator and 1 LS1A

regulator paired with a SD-20 alternator.



I'm curious, where is the "ideal" location to connect the voltage sense wire

(regulator terminal #3) to:

a) Routed back to the battery contactors (i.e. near the batteries)

b) Anywhere on the power bus(es) near the voltage regulators (i.e. inside of

the firewall power bus stud)

c) Through the firewall to the alternator

d) Doesn't really matter (option B for convenience)



   The prefered v-sense points are as shown on Z-14

   . . . or per manufacturer's instructions.



I'm assuming I should also set-up/adjust the regulator/alternator output by

measuring the voltage back by the batteries.



   No, the voltage regulator "knows" what the voltage

   is at its sense terminal. It can make no accurate

   assumptions otherwise. Having said that, voltage drops

   are, by system configuration, tolerably insignificant.

   Fitting the LR/LS series regulators with sense leads

   isolated from the field current supply lead went to

   the idea of making voltage drops elsewhere still more

   insignificant.



   Recommend you wire per suggested diagrams and adjust

   regulator as necessary to achieve 28.5 to 29.2 volts

   at the bus.



   Bob . . .

   Bob . . .

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rtitsworth

Joined: 16 Jan 2006
Posts: 76
Location: Detroit, Mi

Posted: Fri Oct 22, 2010 8:15 am Post subject: Voltage Regulator Sense Wire Location

Bob Thanks,  

   

Answers FYI...  

   

Lancair ES-Turbo (in the Detroit area)  

   

B&C circuit diagram shows sense wire(s) going to the breaker panel/bus, which I can easily do, but that's 14 feet from the batteries via #2AWG (apparently not a big deal).  

   

Rick  

   

   

--

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Oct 22, 2010 1:50 pm Post subject: Voltage Regulator Sense Wire Location

 	  Quote: 	
		  

 B&C circuit diagram shows sense wire(s) going to the breaker panel/bus, which I can easily do, but that's 14 feet from the batteries via #2AWG (apparently not a big deal). 	


    Correct



 

   Bob . . .    [quote][b]

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