I mentioned High Delta, because I thought April did.
3 phase anything REQUIRES a motor starter. Plan and simple. NO iffs about it. They can be electronic or the goofy things with the thermal overloads.
We would always put in something like this: https://www.grainger.com/Grainger/SQUARE-D-Combo-Motor-Starter-1H691?Pid=search It may not be appropriate for you because of the 120 control windings. Usually they contain a transformer to create the 120 VAC in the US.
I'm having a hard time finding a solid state motor starter. Anyway, the boxes above usually contain a disconnect, a transformer (to get the low 120 VAC control windings, 24 VAC might be common in au), A contactor with a thermal overload. An electronic version is only based on Full Load Amps and can be changed via a potentiometer.
A thermal switch is present in expensive motors which is a good place to put them.
There is a fuse for each phase and a fuse for the control voltage.
The disconnect is for safety.
The transformer gets a lower control voltage.
The Thermal/Overload relay is a contactor with an AUX contact. The AUX contact is normally used to give you a Start/Stop pushbutton and disengage with power failure.
We always added another switch that said ON/OFF/Dropout. There is a term called "HAND" that I'm not familiar with.
IF ON, the unit would stay on after a power failure. IF OFF, it would be OFF. If Dropout, then the system would turn off with a power failure.
With critical loads we would add a Three phase Protector. This device would protect against phase imbalance, reverse phase and would have both trip and start-up delays.
So, your risk depends on what it would cost to replace or repair and down time. When a pump cost $5,000 USD which is about the same as AUD $ or when the machine costa bout $15,000-$20,000 dollars and provides infrastructure to three other machines and the machine cannot be moved or shipped, it makes sense to invest in the full protection.
Management never sees the benefit, because it silently does it's thing. The utility company can drop a phase or the phase can get connected wrong. This can be very disastrous to certain equipment such as a compressor.
3 phase anything REQUIRES a motor starter. Plan and simple. NO iffs about it. They can be electronic or the goofy things with the thermal overloads.
We would always put in something like this: https://www.grainger.com/Grainger/SQUARE-D-Combo-Motor-Starter-1H691?Pid=search It may not be appropriate for you because of the 120 control windings. Usually they contain a transformer to create the 120 VAC in the US.
I'm having a hard time finding a solid state motor starter. Anyway, the boxes above usually contain a disconnect, a transformer (to get the low 120 VAC control windings, 24 VAC might be common in au), A contactor with a thermal overload. An electronic version is only based on Full Load Amps and can be changed via a potentiometer.
A thermal switch is present in expensive motors which is a good place to put them.
There is a fuse for each phase and a fuse for the control voltage.
The disconnect is for safety.
The transformer gets a lower control voltage.
The Thermal/Overload relay is a contactor with an AUX contact. The AUX contact is normally used to give you a Start/Stop pushbutton and disengage with power failure.
We always added another switch that said ON/OFF/Dropout. There is a term called "HAND" that I'm not familiar with.
IF ON, the unit would stay on after a power failure. IF OFF, it would be OFF. If Dropout, then the system would turn off with a power failure.
With critical loads we would add a Three phase Protector. This device would protect against phase imbalance, reverse phase and would have both trip and start-up delays.
So, your risk depends on what it would cost to replace or repair and down time. When a pump cost $5,000 USD which is about the same as AUD $ or when the machine costa bout $15,000-$20,000 dollars and provides infrastructure to three other machines and the machine cannot be moved or shipped, it makes sense to invest in the full protection.
Management never sees the benefit, because it silently does it's thing. The utility company can drop a phase or the phase can get connected wrong. This can be very disastrous to certain equipment such as a compressor.