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Thread: My new Hercus 9C and 3 phase.
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1st September 2014, 12:24 PM #1New Member
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My new Hercus 9C and 3 phase.
Hello all, Just got myself a 1972 Hercus 9C, came with some cutting tools, chucks and 2x 3 jaw chucks?
But sadly no gears for threads.
Great thing is everything is tight and apart from a few nicks on the bed it seems in great condition with very little wear.
Only draw back is it is three phase and the cost to connect to my place i cannot afford.
I want to keep it 3 phase and am willing to buy a vfd. Now if i could convert the motor to 240v 3ph it would be nice (and cheaper) but seems the motor is only delta?
I am otherwise happy to get a 240>415 VFD from drives direct to get it running.
Ok a few pics.
The Hercus 9C.
Ok this is the motor plate:
And inside the motor wiring box:
It came on a stand not sure if they had factory stands/tables but it has built in controls and another electrical plate on the door?
Inside the stand it has electrical tranny and wiring diagram:
Now if one of you smarter bloke could confirm if the motor is star or delta it would be much appreciated.
And if it was able to be run on 240v i would assume that the transformer and all in the cupboard would have to be changed aswell?
Thanks
Luke
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1st September 2014, 03:50 PM #2.
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Those motors are almost certainly a Y (well my 1966 Cadet motor was) and if you run it from a 240V VFD you will only get half the power.
The motor can't be reconfigured at the junction box into a ∆ and has to be doctored inside to make it a ∆
Your alternatives are
1) do nothing and only get half the power at 240V 3P
2) take it to a rewinder to get converted (i.e. $$) or DIY
3) Get another motor.
4) You could get a 1HP Y or a half HP ∆ but remember that if you want to use the variable speed then at 25Hz it will only provide half the power.
If you decide to change the motor and want an improved full power speed range Id suggest getting a bigger motor.
I'm using a 1HP 240V ∆ connected motor on my Hercus.
2HP would still give you a full half HP at 12.5Hz, going lower than this may give you motor cooling issues.
One you have selected the motor then choose a suitable VFD.
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1st September 2014, 04:31 PM #3New Member
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Thanks BobL,
Yeah was cruising Ebay today and priced up a 1.5kw (2hp) motor 240/415 3 phase for $70 which would suit a cheap Chinese VFD which are $105.
So for half the cost of a 415v converter i get the benefits of vfd and a more powerful motor.
Now to pull out the old motor and measure the shaft.
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10th September 2014, 10:21 AM #4SENIOR MEMBER
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i have converted several lathes and mills to work off vfd its not too hard ( once you work out how to set the parameters) just follow the circuit diag that comes with your vfd for switch connections . the switches you already have will do the job . you can probably remove all the excess gear in the cabinet to make room for the vfd, from memory the transformer was used for 32 volt light and the rest for interlocks or what ever .
pulley size unless your anal about it isnt too important because you can change speed of motor with vfd to compensate
gears try mal @ australian metalworking hobbyist
john
usual disclaimer get a sparky if your not confident with the leccy bit
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12th September 2014, 03:39 PM #5Senior Member
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motor size
My recommendation, for what it's worth, is 2hp is too big. The "C" model machine was supplied with a motor of 1/2hp-3/4hp you could stretch to 1hp. Overpowering a machine is a dangerous practice. all's good while nothing goes wrong but should you have a problem "things" will break.
Mal
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