VFD size

Colin

Inverter Drive Supermarket are my go to supplier. Prices are reasonable and they have a well deserved reputation for going that bit further to ensure you get a device suitable for your needs.

When you say reconfigured the motor do you mean that you connected the parallel connected "double Y " windings in delta just as is done with a normal motor with single windings?

I'm told this isn't a good thing to do as it reduces efficiency and raises power consumption. Makes no sense to me as surely a pair of parallel windings is equivalent to a single winding. If it works in Y it ought to work in delta.

However there must be a reason why received wisdom is that you can't do the conversion although all the connections are there.

Clive

Colin

Inverter Drive Supermarket are my go to supplier. Prices are reasonable and they have a well deserved reputation for going that bit further to ensure you get a device suitable for your needs.

When you say reconfigured the motor do you mean that you connected the parallel connected "double Y " windings in delta just as is done with a normal motor with single windings?

I'm told this isn't a good thing to do as it reduces efficiency and raises power consumption. Makes no sense to me as surely a pair of parallel windings is equivalent to a single winding. If it works in Y it ought to work in delta.

However there must be a reason why received wisdom is that you can't do the conversion although all the connections are there.

The motorvonly gas sigle windings. I wascheloedvthrough it by the good people on here. If you search for chipmaster motor windings on here you will see all the detail. The motor plate is marked up for both star and delta so I'm happy that it's appropriate. Thanks for the inverter supplier recommendation

Colin

The motor plate shown in your Album is from a 4 pole (1450rpm) so you need to change that in parameter settings if the plated motor is on your lathe.

Emgee

A typical motor rating plate for a 3 phase motor suitable for use with a single phase input VFD will quote a voltage for star and delta connections and also a full load current (FLC) for both connections. Typical figures for a suitable motor will be voltage in Delta 220v and star 400v, currents for a 2.2kW motor will be around 8A in Delta and 5A in star, The VFD parameters should reflect these figures for your particular motor. I believe the Chipmaster had a two speed motor and these are not usually suitable to run from a VFD. If this is the case then a more suitable motor may be required. A picture of the motor plate would be great but I understand it is probably not very accessible in the machine.

Mike

Colin before running out and buying a new VFD check that P12 is set to around 8 amps

H

What is the actual current setting on the VFD? This is P12.0 (motor) and P12.5 (drive). The tables you show say 5A set but that a 2.2kW VFD output is 10A max.

Robert G8RPI.

The challenge using a 2-speed motor with a VFD is that it is not possible to configure the motor to accept 230v three-phase.

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As I understand it, the most common way for a two-speed motor to be configured is 'Dahlander wound'.