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Question:

Proximity switch control relay problem

Dc24v power supply one, 6-36v300ma NPN close close proximity switch one, HH52P DC24V intermediate relay one, 24v solenoid valve 120ma one, I was the relay connected into a self-locking line and then drive the solenoid valve work, so close to the switch close to the metal The object to the relay power, solenoid valve homing, before engaged in once, this time from the Internet to buy two (6-36v300ma NPN normally close close switch) how can not drive the depressed relay went to the last time to close the switch Of the physical store to buy a back on the easy to use, more depressed, and two close to the switch contrast, only the load 200MA and 300MA difference, according to the reason that the load 300MA should be better than two hundred ah, so Rookie to ask the Supreme, is the 300mas close to the switch itself or because the load current caused by?

Answer:

It is your online to buy a close switch problems. In general, the 200MA current drives the HH52 relay is completely without problems. You buy the relay leakage current is too large, so can not turn off.
May 9, 2017
Look at the proximity switch is not bad, npn-type brown positive blue negative black and white normally open white normally closed, then the load when the end of the power supply terminal, the other end of the load connected to black or white
May 9, 2017
Your proximity switch outputs a 24V-signal that requires a 24V + signal to drive the intermediate relay. You are not close to the output of the switch directly connected to the middle of the relay, with the switch in the normal output 24V + to the intermediate relay power supply, if so you can measure the output line near the switch and 24V- between the 24V voltage, Let the proximity switch touch the metal to see if the voltage changes You can connect in your circuit is completed, the measurement, you can determine the problem. NPN output 24V + when not in contact with metal. When exposed to metal, the output 24V- (24V low frequency side)
May 9, 2017

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