Teco L510 VFD overload trip

[zbang]

Perhaps my addled brain is missing it, but I don't see how to program this VFD to trip off at a programmed overload level. We're using it to drive an art display and want it to just stop if someone drops trash or junk in the works and jams the mechanism.

IIRC it has a 1/2 HP 40:1 gear-motor running at about 7 Hz. If I jam the mechanism the motor does stall, but I'd like it to stop. (I haven't yet measured the run current, but it's got to be close to nothing, doing that tomorrow.)

If someone can point me to the correct register, I'd be grateful.

 

[ptonsparky]

Use an onboard output relay to monitor motor rpm. Have it fault at x rpm, and use a digital input to flag an external fault.

or give me a minute and I'm sure there is a better way.

 

[ptonsparky]

Try
03-11 =【5】. RY1 output is active when the output frequency is below the frequency detection level (03-13) and turns off when the output frequency falls below frequency detection level.

You may need to change the state of the relay from Open to Closed.

 

[zbang]

Interesting approach but I'm not sure if that will trip when the actual motor speed drops or when the Hz setpoint drops.

 

[ptonsparky]

IDK on that either.
You would to think that would have a stall monitor of some sort.

40:1 reduction plus 7 hz gives you about 5 rpm final?

 

[Jraef]

08-05 is where you program the OL action, i.e. whether you want it to trip, then if you want a different trip time for cold or hot start. Basically, it trips at 150% of rated current in 3.5 minutes for hot start, or 5.5 minutes for cold start.

You can't set the level of trip current directly, you can only set the Motor Rated (nameplate) Current, in 02-01. So if you want it to trip at less current, you will have to "lie" to the drive as to the motor FLA setting.

A lot of VFDs will provide a SEPARATE trip point for something like "Jam" protection, or "Electronic Shear P{in", but this drive does not have anything like that. You only have the OL protection.

 

[ptonsparky]

I've used a prox switch to count teeth. As slow as this is you could probably set one up on a small tdr to time out if it doesn't see one in xx seconds

 

[zbang]

@Jraef Thanks for that, makes sense (lie to the controller ), one of my coworkers though it had some sort of jam protection. With the (lack of) rolling resistance of the piece, I suspect the OL setting will be rather low, so we may just let things go. (I have all weekend to try things....).

@ptonsparky For the next one I may look at using some sort of a movement detector/teeth counter, but also at a VFD with jam protection. Or get the designers to include some sort of a slip clutch/torque limiter.