Hi ALL,
I m having digital output with 150mA Max.Current and a Relay of "HLS-CMA3-B" rating:40A/14VDC 560W DC12V.
I need to operate this relay using this DIO(Open Collector Output).
Is this possible or any pull-up resistor is required if yes need detailed circuit.
Here with the link having details about relay
Ningbo Helishun Electron Co.,Ltd.
Please reply ASAP. Thanks
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capa_master:
Can you use the 24V model? The 12V one may need a current slightly higher than the port can provide (up to 165 mA).
Or you can try to power it from 10V. It should operate correctly and absorb less than 150 mA.
You can directly connect the relay between the output and the +10 V.
Remember to place a diode (e.g. 1N400x) in parallel with the relay, with the mark towards +10V.
capa_master:
There's no -B. Did you mean -2? In this case you can power it from +12V.
"capa_master" schreef in bericht news:h snipped-for-privacy@giganews.com...
According to the datasheet the coil resistance is 90R+/-10%. So using a 12V power supply the current will worst case become 12/81=148mA which is within the specs. Don't forget the diode however.
petrus bitbyter
any relay that handles 40A on the contacts at that voltage, is most likely going to run close or over that current rating in the coil..
Looking at the spec's, it looks like you may have a 90 ohm coil.. ~ 130 ma's
It's not a good idea to operate DIO at max levels for a prolong period.
I would use a PNP tranny to give the IO a little more help..
You would be souring the relay instead of sinking how ever, the IO output can still be of a lower voltage range and sufficient to bias the PNP in a high side config, for the relay..
P.S. don't forget the put a diode on the coil to absorb back energy
petrus bitbyter:
Which one? The HLS-CMA3 datasheet shows two different coil resistances. Looking at the HLS-CMA3-1 and HLS-CMA3-2 datasheets it seems that coil restistance is the only difference between the two.
However, I could not find any HLS-CMA3-B datasheet.
You forgot the transistor's VCE. I used 0,6 V.
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The last letter has to do with the contact form. For the HLS-CMA3-1 the B has not been specified. The other Bs have 90R coil resistance.
The Vce of a saturated transistor can go down below 0,2V, so I neglected it.
To lower the voltage accross the coil a litle (and so the current through it) you can use series diode like an 1N400x. According to the datasheet the relay wil still operate with 7.8V.
petrus bitbyter
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