I need help. I am building a vacuum table and have just acquired a Vacuum Pump.
This pump needs a cable to be to be wired in, I can see terminals marked U1, V1 and W1 on one side and U2, V2 and W2 on the other side. Where do I connect my Brown, Blue and Earth wires here in the UK. The Pump is 240V single phase.
I assume there’s no wiring diagram on the underside of the cover. Otherwise I would ask the seller to provide one. The number on the motor (EN 60034 3) looks like it’s an industrial standard for a 3 phase motor. Do you have a picture of the whole motor? If it’s 3 phase it’s not going to have capacitors for starting and running.
I have just been up to my shed to check and yes the yellow and red are connected together
(Aiph5u (not affiliated with Onefinity))
@Dr-Al is right, a three-phase motor has no capacitor if it is made for running on three-phase current. But Induction motors can have a capacitor, and the reason is that the capacitor creates a helper phase in order to be able to run the motor on single-phase current.
Of these types of capacitor motors, there can be those with three windings which are normally used on three-phase current, and the cheaper with two windings that are exclusively made for use with a capacitor.
They are wired like this:
Source: PieterJanR, Public domain, via Wikimedia Commons