Ken Roach
Lifetime Supporting Member + Moderator
I have an application where I have to detect the start of motion (non-zero-speed) quickly, and also be able to detect overspeed of around 3000 RPM.
The sensor is a simple 60 pulse per revolution quadrature output encoder.
I've found devices that give me zero speed detection, and devices that give me overspeed detection. The IFM DD110S (overspeed) and DA102S (zero speed) and Rockwell MSR75 (zero and safe speed zone) have all been used by my co-workers.
But as far as I can tell, all of those have either zero-speed or over-speed or safe-speed-range detection. They don't do both zero-speed detection and overspeed detection in the same module.
And it doesn't really need to be a safety device; the functions are to protect well-guarded machine elements, not to protect people.
I can run these encoders into a motion controller, or into a MicroLogix 1400's high speed counter, if I'm willing to expand the budget. But my boss would prefer the simplicity of a dedicated purpose relay.
Any suggestions ?
The sensor is a simple 60 pulse per revolution quadrature output encoder.
I've found devices that give me zero speed detection, and devices that give me overspeed detection. The IFM DD110S (overspeed) and DA102S (zero speed) and Rockwell MSR75 (zero and safe speed zone) have all been used by my co-workers.
But as far as I can tell, all of those have either zero-speed or over-speed or safe-speed-range detection. They don't do both zero-speed detection and overspeed detection in the same module.
And it doesn't really need to be a safety device; the functions are to protect well-guarded machine elements, not to protect people.
I can run these encoders into a motion controller, or into a MicroLogix 1400's high speed counter, if I'm willing to expand the budget. But my boss would prefer the simplicity of a dedicated purpose relay.
Any suggestions ?