Trevor WI Allertor It's Seriously SICK!

[ThunderboltFreak]

It would be cool if someone could get a video of it. 8)

[Brendan Ahern]

I have seen a 30HP pump motor start and run at less than half speed on 2 of 3 phases before. It ran for about 15 minutes before it finally fried. One of the apprentices started it and had no idea of the problem, by the time I showed up it was fried. I was able to have it rewound though. So yes, it could run for a short period like that without it frying. But it probably has done damage to the windings.

[Robert Gift]

Hopefully short tests (1 to 3 minutes) end before the coils get too hot and burn.
Also, don't these motors have internal heat sensors which open before coil distruction if they get too hot?
I hope someone can inform that fire station before they ruin their Allertor.

[SirenMadness]

I don't think that something like an outdoor warning siren would have a heat-sensor. If the limit of non-stop work for a particular siren is, say, fifteen minutes, then you give out a signal for a maximum of fifteen minutes, which is more than enough. There is not use in spending too much money.

[Robert Gift]

Many motors have internal heat sensors.
Our 2t22A has at least one, I think three - one for each phase coil.

If a siren gets stuck on, this prevents motor destruction.
Also, if the motor is jammed and won't turn, or if it will not turn up to speed, such as one leg of three-phase failing, this would protect the motor.

The 2t22 has two blue wires which are to connect to a relay switch.
If any of the sensors in series opens, the two wires do not allow power to the switch coil which holds the switch points closed, and the switch opens.

The 2t22A has a 15 minute duty cycle. I have read of sirens sounding for hours, or others sounding, then turning off, then sounding again.
It may be their thermofuses turning them off, then when the thermofuses cool enough, they close and the siren operates again.

Perhaps my term is wrong. These devices are not fuses - needing replacement. They reset when cool.

[500AT]

Perhaps my term is wrong. These devices are not fuses - needing replacement. They reset when cool.

This sounds more like an automatic circuit breaker than a fuse.

[12kvLive]

Most typical 3 phase motors do not have internal protection. It is a added feature that most do not pay for. Motors are usually protected by the motor starter. It is a relay with a thermo-element device that is matched to the motor's H.P. If to much load passes through the starter it heats up the thermo-element which in turn opens a magnetic relay killing power to the motor.

[Archon]

It seems this allertor has had motor ploblems in the past it has burnt up the motor twice already I was told. And no it can not be the transformors as they also power the P-50 and it would not work at all it they were the problem

[Robert Gift]

If two motors have failed, something must be wrong with the power.
Unless the rotator drive train is imposing extra load on the motor.

[Gil]

Archon, you should fix their Allertor