Open collector output to operate relay

C

capa_master

Guest
Hi ALL,

I m having digital output with 150mA Max.Current and a Relay o
"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 detaile
circuit.

Here with the link having details about relay

Ningbo Helishun Electron Co.,Ltd.


Please reply ASAP.
Thanks



---------------------------------------
Posted through http://www.Electronics-Related.com
 
capa_master:

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).
Click to expand...
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:

Hi ALL,

I m having digital output with 150mA Max.Current and a Relay of
"HLS-CMA3-B"
Click to expand...
There's no -B. Did you mean -2? In this case you can power it from +12V.
 
"capa_master" <capa.master@n_o_s_p_a_m.gmail.com> schreef in bericht
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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



---------------------------------------
Posted through http://www.Electronics-Related.com
Click to expand...

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
 
capa_master wrote:

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



---------------------------------------
Posted through http://www.Electronics-Related.com
any relay that handles 40A on the contacts at that voltage, is most
Click to expand...
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:

According to the datasheet the coil resistance is 90R+/-10%.
Click to expand...
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.

So using a 12V power supply the current will worst case become
12/81=148mA
Click to expand...
You forgot the transistor's VCE. I used 0,6 V.
 
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petrus bitbyter:

According to the datasheet the coil resistance is 90R+/-10%.

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.

So using a 12V power supply the current will worst case become
12/81=148mA

You forgot the transistor's VCE. I used 0,6 V.
Click to expand...
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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