Hello everyone, I’m in need of a rotary solenoid that can be controlled and activated by a cDAQ-9171 CompactDAQ Chassis. Could anyone assist me with this?
Welcome to the TechForum mfr7.
Here are the rotary solenoids that we have available: https://www.digikey.com/short/024fmp15
I do not know what voltage you can output from your cdaq-9171 to control it.
Maybe one of the engineers on the TechForum can add to this post.
Hey David,
Thank you for your message, I am not sure about the voltage.
I will wait to get it from some of the engineers, and then I will purchase the correct rotary solenoid.
None of the suggested solenoids will be directly drivable from a data acquisition module; they require far more power than is available from a signal-level output.
Typical practice would be to provide an auxiliary power supply of a voltage suitable for any desired accessories, and control them using a transistor, solid-state relay, or similar device that can be driven from a signal-level DAQ output.
Dear Rick, thanks for your response. Could you suggest any product that I can use in between the DAQ and the solenoid to make the system works, as you mentioned?
The options are numerous, ranging from dedicated relay drive modules made by your DAQ manufacturer, to discrete components to DIN-rail mountable modules. What you want the physical result to look like will guide the choice of device to use.
The general idea is that the small signal available from the I/O module needs amplification to be able to drive a relay, and whatever device is used to do that must be protected against the effects of the relay coil’s inductance during turn-off. A simple approach to this is pictured below. Pick Q1 to tolerate the required load current, be drivable with the available I/O voltage, and withstand the auxiliary supply voltage Vcc with a good margin left over. Pick TVS diode D1 to not conduct when Vcc is imposed across it, while having a clamping voltage less than the withstand rating of the protected transistor, Q1. For improved protection of the DAQ device under fault conditions, substitute the transistor with a solid state relay of suitable specifications.
