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I would have expected a click too. But how about you test continuity across the HV terminals as you apply power?
Continuity across the HV terminals is zero.I would have expected a click too. But how about you test continuity across the HV terminals as you apply power?
Well, I'm plugged into a standard 12V car battery, so 1.4A should be no problem. Actual current draw on the LV terminals is zero. (coil problem?)Also, the specs for that contactor say <=16 W consumption on the coil, so are you providing at least 1.4 amps of 12v current?
Not sure I understand. Do you mean on the HV terminals? I have literally nothing plugged into the HV terminals. On the LV terminals, voltage is ~12.5V. Where do you see the "low voltage rating"?It has a really low voltage rating...what is your battery voltage on the high current side?
edit: before Brian jumps in my poop, nothing to do with testing or actuating it. Observation.
Resistance is around 350Ohms (I have a back EMFdiode soldered across the coils, so that may also be affecting the resistance? It's 350Ohms both ways). BUT, I may have ordered the wrong contactor. The one I ordered (off AliExpress) said "400A / 96V", which I assumed was referring to the Pack voltage, and not the coil voltage. Did I just read it wrong?Measure the coil resistance, you should be getting something close to their datasheet. And to double check - is yours definitely a 12v coil one ? This model seems to be available with different coil voltages, any chance you got the wrong one ? Either way, coil resistance will tell you if you got the right one.
Good catch!That's 96 Chinese Volts, which is 80 worldwide volts.
Dammit. Pack is going to be a 32S LiFePO4, so... ~102V?That's 96 Chinese Volts, which is 80 worldwide volts.
Seriously, look at the datasheet. It's rated at 80V max.
That's why I asked what your pack voltage was.
Seems super weird then that the resistance would read the same forward and backward, with the diode in place.With a back emf diode, it should read short in the diode forward direction and 350ohms in reverse (the direction of current in your application).
If you're using a current limiting supply, a forward biased diode will short the coil and no clickey, no cooking of the diode.
Personally I wouldn't worry about slightly overdriving the contact voltage as long as you're staying within the current rating. Coil voltage is a bigger problem though - sounds like your pack voltage may be too high for it, and 12v is too low... if you have PWM on your motor controller, perhaps it can supply it with expected voltage by reducing the duty cycle ? The only other way around it is with a DC-DC converter, but it starts getting convoluted and introduces points of failure.Dammit. Pack is going to be a 32S LiFePO4, so... ~102V?
Seems super weird then that the resistance would read the same forward and backward, with the diode in place.
Either this thing is FUBARed, or (more likely) I just ordered the wrong one. Think I'll switch to the GigaVac GV200 instead...
Resistance is around 350Ohms (I have a back EMFdiode soldered across the coils, so that may also be affecting the resistance? It's 350Ohms both ways). BUT, I may have ordered the wrong contactor. The one I ordered (off AliExpress) said "400A / 96V", which I assumed was referring to the Pack voltage, and not the coil voltage. Did I just read it wrong?