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06-27-2020, 06:40 AM
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#1 |
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Not Yet Wild
Join Date: May 2020
Location: Nova Scotia, Canada
Posts: 25
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Solenoid Diode Question
Im upgrading from 36 to 48 Volts the HD solenoid I ordered has no resistor or diode so I ordered a 470 ohm 10 watt resistor but don't know what specs I need for a diode, I seen it should be 3 amp but what voltage rating?
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06-27-2020, 11:03 AM
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#2 |
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Techno-Nerd
 Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Solenoid Diode Question
100V or higher.
Also, which drive system, not all of the use a pre-charge resistor and some use a regen diode. |
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06-27-2020, 01:10 PM
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#3 |
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Not Yet Wild
Join Date: May 2020
Location: Nova Scotia, Canada
Posts: 25
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Re: Solenoid Diode Question
Series motor with a Alltrax SR controller
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06-27-2020, 04:09 PM
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#4 |
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Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Solenoid Diode Question
That uses a pre-charge resistor (470Ω for a 48V pack) and a diode on the small terminals.
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06-27-2020, 04:28 PM
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#5 |
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Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Solenoid Diode Question
I've seen spikes exceeding 1,000v from the solenoid as it disengages.
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06-27-2020, 04:57 PM
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#6 | |
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Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Solenoid Diode Question
Quote:
 Are those 1kV spikes from coils without a suppression diode attached? |
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06-27-2020, 09:59 PM
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#7 |
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Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Solenoid Diode Question
Yes. And I'd say those could be pretty harmful to small switches over time.
I've never measured how high the spike goes with a diode in place. (Or I should say, never seen a notable spike with a good diode in place). |
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