speed sensor troubleshooting

Thread Starter

payal.kellyyy

Joined Mar 28, 2011
28
I am having some problem in a speed sensor..It is showing a low current on the plc(5.3mA).

Please find attached the circuit diagram for the same.

I have checked voltage across all the components of this sensor .Please find below the readings for the same:

VR1=2.825V
VR2=0.153V
VZd2=8.54V
VD1=0.66V
VC1=8.52V
VC3=1.982V


OUTPUT CURRENT =10mA

I have checked resistors also but could not figure out the problem can you help me in its troubleshooting? What all can be the possible reasons for low current in a speed sensor.

Can you figure out in this that which component has failed in this circuit ?

Waiting for good replies .
 

Attachments

praondevou

Joined Jul 9, 2011
2,942
Where do you have this current? Are you talking about the power consumption of the sensor? According to the datasheet it's typically 5.3 to 5.9 mA.

Or is it the output current? This depends on what you connect to the output as it is open collector.
 

shortbus

Joined Sep 30, 2009
8,044
@payal.kellyyy- One thing you don't say about your sensor or show in the schematic, is what magnet are you using?

If you are detecting a moving magnet, no problem.

If you are just trying to detect a gear tooth or other iron object that is your problem. According to the data sheet that BillB3857 linked to you need to put a magnet behind the sensor in that type of use. Without the magnet your sensor won't generate enough of a output.
 

Thread Starter

payal.kellyyy

Joined Mar 28, 2011
28
@payal.kellyyy- One thing you don't say about your sensor or show in the schematic, is what magnet are you using?

If you are detecting a moving magnet, no problem.

If you are just trying to detect a gear tooth or other iron object that is your problem. According to the data sheet that BillB3857 linked to you need to put a magnet behind the sensor in that type of use. Without the magnet your sensor won't generate enough of a output.
Dear Shortbus,
In my sensor also we are using a magnet which is placed behind the Hall Ic.
 
Top