overtemp cutoff

[brokenot]

I think the worst thing to do is shut down an overtemp engine wtihout a cool down time.

None of the equipment we have in the fleet that's equipped with Murphy magnetic switches shuts down the engine immediately when a fault occurs. Murphy sells them with a variety of delay timers built in. The stuff we have shuts down after 30 seconds.

Here's what they have available:

Magnetic Switches

 

[Leejohn]

None of the equipment we have in the fleet that's equipped with Murphy magnetic switches shuts down the engine immediately when a fault occurs. Murphy sells them with a variety of delay timers built in. The stuff we have shuts down after 30 seconds.

Here's what they have available:

Magnetic Switches

I looked at this also while there. 20 Series Temperature Swichgages

 

[jinman]

My G1800 Kubota lawn tractor has a temperature gage and an audible alarm from an overtemp switch. The audible alarm is a horn that sounds when the temperature reaches about 250 degrees F. I have tested the function by grounding the sensor and the horn is not very loud, but I think a louder 12V buzzer could be added. I would expect the TG1860 to have the same setup, but that may not be the case. I'm not sure about the B2400 or BX2230, but they might even already have something similar. Too bad they don't have these that trigger a shock collar.

 

[Soundguy]

still not an imense help.. if the op doesn't know it's overheating, then he keeps running it.. the delay just means he runs it 20 more seconds hot.. if it showed a warning like a flashing lamp, then the op could drop the throttle immediatly, and let it idle those 20 seconds to at least get some oil thru the turbo bearings for a bit before it shuts down and cokes them up.. etc

soundguy

None of the equipment we have in the fleet that's equipped with Murphy magnetic switches shuts down the engine immediately when a fault occurs. Murphy sells them with a variety of delay timers built in. The stuff we have shuts down after 30 seconds.

Here's what they have available:

Magnetic Switches

 

[brokenot]

still not an imense help.. if the op doesn't know it's overheating, then he keeps running it.. the delay just means he runs it 20 more seconds hot.. if it showed a warning like a flashing lamp....

Easy....in order for the Murphy magnetic switch to work, it needs to be wired to one of their switchgages like this:

20 Series Temperature Swichgages

The switchgage is what tells the Murphy switch to shut the engine down. The delay is built into the Murphy magnetic switch. So it's very simple to wire the switchgage contacts to sound an alarm or turn a warning light on and trigger the Murphy switch.

Our equipment has high-pitched piezo alarms that can't be mistaken for anything else on a jobsite like a back-up alarm for instance.

I'm not a big fan of dash-mounted warning lamps unless the equipment has a cab. Out in direct sunlight lamps can be tough to see, and if the operator is looking to the rear/up/sideways a good portion of the time....lamps can be missed. Additionally, if you have an operator that sees a light and ignores it....what good does the light do?

I understand the concern about turbo coking and such, but unless the operator makes it day-in day-out common practice to let an overtemp system shut him down at full-throttle, it's pretty much a non-issue.

 

[Soundguy]

I fire operators that don't look at gauges.. that's why we still have old equipment that runs.

there's plenty of people looking for work.. don't take long to find one that knows how to glance down at a cluster every 5 minutes. WAY cheaper than 47 safety idiot proof systems being retrofit to some piece of equipment

soudnguy

 

[brokenot]

don't take long to find one that knows how to glance down at a cluster every 5 minutes. WAY cheaper than 47 safety idiot proof systems being retrofit to some piece of equipment

I hear you, but what's going on in between those once-per-five-minute glances at the gauges?

I'm not "Big Brother", but if I've set a switchgage to a given temp, (or whatever else the parameter may be), then I know it'll shut down. Try as I might, I can't control what the operator sees/thinks/feels/interprets when a gauge reads "X", let alone what his/her reaction will be to that situation.

I do know that if my sole means of protection is a gauge, and the operator sees an abnormal situation and chooses to ignore it, then that same operator will deny noticing anything was wrong prior to the expensive ka-boom. The burden of proof would then fall to me.

And I wouldn't be able to prove a thing.

 

[Soundguy]

at that point it's not a proof issue.. it's a broken down machine.

once you pop the top it will be telltale what happened. I like to find ops that treat the equipment like their job / eating depends on that machines health.

soundguy

 

[some zilch]

someone who cant look down at gauges and know the general operating condition has no place on a machine not owned by them.

 

[Egon]

I hear you, but what's going on in between those once-per-five-minute glances at the gauges?

I'm not "Big Brother", but if I've set a switchgage to a given temp, (or whatever else the parameter may be), then I know it'll shut down. Try as I might, I can't control what the operator sees/thinks/feels/interprets when a gauge reads "X", let alone what his/her reaction will be to that situation.

Only way to tell if an operator isn't watching the gauges is after the machine is broke down in an area related to the gauges.

In industrial situations there are usually sound and light alarms with one being a warning and the other a shutdown.