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sorry, i am preparing the circuit now.
Whenever i trigger the solenoid in high speed as described in A(Rising & Falling interval is 80us) C happens occasionally, which it is a problem for me.
The controlling waveform is normal, C happens only when it is used to trigger inductive load.
Hi all,
Probe is connected at mosfet output(where solenoid is triggered) and below is what i got.
**broken link removed**
A - Rising & Falling interval is 80us [it off before on completely]
B - Rising & Falling interval is 1ms [it off after on completely]
C - Output remains ON for more than...
Hi,
jpanhalt - this motor is able to cable both frequency 50hz & 60hz. my main frequency is 50hz
BradtheRad - any recommend brand for my info? i couldnt get it from digikey mouser e14 & rs
base on datasheet this induction motor current consumption is around 0.15A only
thanks~
ok, let try an easy way.
instead of complicated circuit, i wonder is there any 230 to 200 transformer or 230 to two 100 transformer?
anyone experience this before?
thanks
hi guys,
i bought a ac motor from japan, supply voltage is 200vac but my country is 230vac.
Motor runs when i supply 230vac but it become very hot after 10min so i believe the supply voltage is over its spec.
possible to reduce heat if i add a SSR with kickback diode between contact and run...
Hi IanP,
can you please help to provide a rough drawing/circuit "connect [input-output]==>[input-output] in series"?
i cant get the picture.
Btw i think you have miss out the attachment previously.
thanks for help.
because i am trying to connect both lm7805 in series so that the input voltage is 6V per unit hence less heat will be generated.
assume 800mA will be used for my circuit.
This idea come to me in a sudden.
As i know 12V input to 5V will have 7V heat losses.
So just wondering if series as in attached diagram make it two unit with 6V input to 5V will be ok or not.
please advise which consideration i have missout.
Thanks
hi, my circuit is as below.
The probe is connected parallel to the switch and RC snubber.
and the current flow to the solenoid is around 17mA.
Transient shown previously happens when the switch opened.
FvM - i have forgotten the timebase will check and update you.
so ill stick with 22ohm...
hi, i have build the circuit to switch a 24Vdc solenoid valve as shown previously.
when the switch open i can see a voltage transient to around 70V using oscilloscope.
waveform as shown below.
But when i install a RC parallel to the switch the spike remain (no changes at all)
I did try...
ok, this makes sense. thanks FVM
nextly I want to do testing on breadboard, can you recommend which type of R and C i should select.
a 24Vdc pneumatic solenoid valve will be the inductive load for this testing.
tq
Hi guys,
From what I read they said there is leakage current in RC snubber when it connects parallel with switch.
But in simulation, the ammeter doesnt show any leakage current.
Anyone has any practical experience for above case?
If I want to build the circuit as shown above any type 100ohm...
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