ULN2803 to drive 24VDC relay for 24VDC solenoid valve

Thread Starter

pr123

Joined Mar 13, 2015
30
Hi,
I'm using a ULN2803 IC to drive a solenoid valve 24VDC throughy relay (DIN rail mountable with base) which is rated for 28VDC,10A. How can i be sure this will work? what parameters should i calculate for this? i have worked with ULN before but it was for 12VDC PCB relay and 12Vsolenoid.
 

ericgibbs

Joined Jan 29, 2010
8,719
hi,
The ULN will work at 24V without any problem.
I would require the 24V relay coil resistance needs to be specified, I would estimate a resistance of around 800 ohms.
Don't forget to connect the ULN's common diode pin to +24Vdc
E
 

Thread Starter

pr123

Joined Mar 13, 2015
30
yes, ULN connection COM has to be connected to 24VDC and 9th pin to GND. Resistance is not mentioned exclusively but coil current mentioned is 56mA .
 
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