Hello,
I am using Delta (DSML-1153-24C) solenoids to control gates on a production line. I am controlling them using a PLC and an HBridge circuit. I don’t think I have a good understanding as to how these parts are to be used. I initialize all of the solenoids by powering them to retract then deenergizing after ~100mS. This initializing works fine. The next step is to extend the plungers, wait 100mS, then deenergize. My issues started when only about half of the solenoids extended. I thought I might be deenergizing to soon so I started making the cutoff time longer. It did not seem to solve the issue. The timing did not make sense to me so I connected one of the solenoids on the bench to a +24V supply thru a 0.1ohm resistor to monitor current draw. The scope plot showed the current draw lasted about 50mS then the power went down to about zero. Can you provide some explanation as how these work ? How I can use them properly?
Thanks,
Mark
Hello markwitt3, Welcome to the DigiKey TechForum.
DSML-1153-24C is a latching solenoid, which use a magnetic latch to hold the plunger in place after actuation, so continuous power isn’t needed. When you apply a pulse of +24V, the solenoid pulls in and latches; to release, you need to apply a reverse polarity pulse. If you are experiencing issues with the solenoids only extending half-way, this could be insufficient pulse strength or an issue with polarity. Ensure the H-Bridge is configured to switch polarity correctly and that the pulse duration matches the solenoid’s pull-in time (around 50ms). If this doesn’t solve the problem, there could also be an issue with the spring in the solenoid.
This post may be of interest, as an example discussing use of the part in question.
One would expect to see some transient behavior as the mechanicals are in motion, but after things have settled there should be roughly 300mA flowing with 24V applied. Observation to the contrary would appear to suggest an issue with measurement or the controlling apparatus.