Protecting PLCs and Drives

I like to put them in a box so that the flying monkeys cannot get to them.

My cousin Guido will make sure nothing bad happens to them for about $200 per month.

When they have sex, I make sure at least one of them is wearing condoms.

I always recommend a good insurance policy against fire, floods and other natural disasters.

Shin guards are a good idea if either of them are playing soccer. Athletic cups are mandatory if they play baseball (or cricket depending on where they are in the world).

The point of my sarcasm is that the word "protection" is entirely too nebulous to mean anything. Nobody is charging you by the word here, please describe exactly what you want to know.

For example, fuses, MCB, MPCB & OLR are provided to motor as protection.

same way what is required for PLC & DRIVES.

i don't know why you are talking about monkeys.

Actually, I kind of liked JRaef's answers. Pretty funny! But I suppose you mean to ask about overload protection or perhaps surge protection? Most circuits are protected from overload by a family if devices. Circuit breakers (or fuses) are the most common overload device designed to interrupt power to something if it draws too much current. This is basically fire protection.

If you want protection from surges (inductive overvoltages) you have a number of choices that may depend on the environment. Since you asked about protecting a PLC (programmable logic computer?) it would imply that you were in an industrial environment which may be in need of power conditioners that absorb spikes. The problem with a lot of those devices is that you never know when they have failed.

Maybe the protection you want is from "brown-outs"? A decent uninterruptible power supply (UPS) will take care of both conditions. Look for your answers in the literature that came with the devices. A lot of that is available on-line at the manufacturers web site. As far as the drives go, I can only guess what you are describing. Are you speaking of variable frequency motor drives or something else?

Every circuit is protected by overcurrent devises. Fuses or circuit breakers. Each piece of manufactured equipment has an amperage rating that should be listed on the equipment or in the service manual. You gather this information and design your circuits appropriately. Does this help?

Good luck,

James