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12-19-2012, 04:51 PM | #21 |
Not Yet Wild
Join Date: Sep 2011
Posts: 65
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Re: Key Switch/Voltage Reducer question
Okay. I'm totally lost. Please look at the pictures below and tell me how to hook up the 2nd solenoid to control the voltage reducer. Here is what I have
Picture one is the solenoid on the cart. Terminals #1 and #2 have battery pack voltage (38v) all the time with the key off. Terminal #3 gets 38v with the key on, which then gives terminal #4 36v. There is no diode present anywhere on this solenoid. Note: terminals #3 and #4 have continuity at all times. So I'm confused as to what is actually switching? Picture 2 is the solenoid I have to run the voltage reducer. Note: terminals# 3 and #4 also have continuity at all times. PICTURE #1 PICTURE #2 |
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12-20-2012, 05:59 AM | #22 |
Not Yet Wild
Join Date: Feb 2012
Location: Dearborn, MI
Posts: 27
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Re: Key Switch/Voltage Reducer question
racinjason89, The solenoid in you first picture should not be used in your voltage reducer circuit as it is subject to high voltage spikes. The purpose of this solenoid to to provide high current voltage to you motor.
The small post on the solenoid are always going to have continuity as they are the activation for the magnet the pushes up the plunger that closes the bridge across the two large posts. Use the key switch for B+ on one small terminal and the other small terminal goes to B- on the battery pack. Next the large terminals on the solenoid just interrupts the flow of current like water running through a pipe that has valve. When the plunger in the solenoid closes the bridge across the large terminals, which is activated when the key switch on, current is allowed to flow. Thus, one large terminal goes to B+ on the battery pack the other to positive input on the voltage reducer. Then run the B- input on the voltage reducer back to B- on the batter pack. As for the diode it get placed across the small terminal of the solenoid the band on the side that run to the key switch. |
12-22-2012, 12:30 PM | #23 |
Member 23082
Join Date: Mar 2010
Location: Spokane Washington
Posts: 1,169
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Re: Key Switch/Voltage Reducer question
I could use some feedback.
I am using a contactor to turn on my voltage reducers (72 volt to 12 volt), switched by the ignition (dark blue wire). The contactor is has two "Load In" wires (1 to the ignition (light blue) and 1 to the 72v battery pack (white)). On the "Load Out" side of the contactor, I have 3 leads to 3 voltage reducers (3 white) and one lead to the positive side of my voltage meter (red). My voltage meter failed, and while I have been told this is a fluke, I am wondering if the spike of volts to the meter when the contactor closed is the reason. I am installing a new voltmeter this morning and wondering if I should get the positive lead from somewhere else. Perhaps off of the ignition? I don't want to run it directly from batteries as I don't want to install another switch just for this. I guess I am not sure if the contactor is the reason this voltmeter really died, you would think these meters are always subject to a spike when they initially get powered up. Am I overthinking this? |
12-22-2012, 03:22 PM | #24 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Key Switch/Voltage Reducer question
Quote:
2. Looks okay. 3. I don't see anything that should blow a voltmeter in that set-up. In general terms, DVMs are fairly impervious to spikes due to their high input impedance. |
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12-22-2012, 03:24 PM | #25 |
Member 23082
Join Date: Mar 2010
Location: Spokane Washington
Posts: 1,169
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Re: Key Switch/Voltage Reducer question
It is just a tie-in - thanks for the feedback JohnnieB
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12-28-2012, 09:50 AM | #26 | |
Not Yet Wild
Join Date: Sep 2011
Posts: 65
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Re: Key Switch/Voltage Reducer question
Quote:
Thank you for the reply. I'll give that a try. |
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