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What happen when 3 phase disconnection from power supply?

Updated: 8/19/2019
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12y ago

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3-phase power supply is a rarity in residential (home) electricity. Utility companies will supply 3-phase power to farming operations, upon request and payment, at least in North America. This kind of electrical power is normally supplied to industrial enterprises.

When a properly wired 3-phase electrical machine is disconnected from its (typically 480 Volt) electrical power supply, the following results should occur:

Any and all machine motion stops, or begins to coast down to a quick stop.

Industrial robots within the machine suffer a "hard stop." Their drive motors lose power and their spring-loaded brakes (held off by electrical power) slam on.

Air pressure to the machine is cut off and residual pressure is exhausted by a safety air valve.

Hydraulic pumps lose power and stop supplying fluid pressure.

Various cylinders may relax under the force of gravity, which cannot be turned off, and cause a short-lived residual motion.

All safety systems will be disabled, and all indicator lamps will go off.

Capacitors in the electrical system may still retain voltages dangerous to operator safety, especially if they are not equipped with "bleeder" resistors.

Any control panel may contain multiple electrical power sources within, hopefully designated by yellow wires, and not be killed by the disconnect.

There is no safety system that can negate the weight due to gravity.

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Q: What happen when 3 phase disconnection from power supply?
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