7I77D over heat
- okielaxplyr
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27 Feb 2026 01:20 #343573
by okielaxplyr
7I77D over heat was created by okielaxplyr
I am using a optocoupler (from amazon) between my 7i77D output and a solenoid valve for a spindle break in the sinking configuration, the output is over-temperature faulting for some reason.
using TB8 OUTPUT0. Field voltage is 24Vdc and driving the relay with the same 24 power supply.
I set up the opto relay on the bench and it only draws 2.2ma on the input in low position.
I'm kind of at a loss, the manual says the outputs can take up to 350ma.
Please advise
John V.
using TB8 OUTPUT0. Field voltage is 24Vdc and driving the relay with the same 24 power supply.
I set up the opto relay on the bench and it only draws 2.2ma on the input in low position.
I'm kind of at a loss, the manual says the outputs can take up to 350ma.
Please advise
John V.
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- tommylight
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27 Feb 2026 01:27 #343574
by tommylight
Replied by tommylight on topic 7I77D over heat
Moved to "driver boards".
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Check the wiring, or post pictures of the wiring here so we can have a look.
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Check the wiring, or post pictures of the wiring here so we can have a look.
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- PCW
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27 Feb 2026 01:40 #343575
by PCW
Replied by PCW on topic 7I77D over heat
Yes, typically this is caused by a wiring error or worst case,
a damaged 7I77D output chip.
a damaged 7I77D output chip.
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