Pony Motor
Pony Motor
(OP)
Hi Guys,
I wish to upgrade from a 150kW 4 pole motor to a 330kW 4 pole motor. The application is a wood chipper in a sawmill.
The supply to the MCC this motor will be supplied from is not large enough to support any thing greater than a 250 kW motor.
I am thinking of using a pony to run up the large motor and when at sync DOL the motor.
I am also considering using a second 150kW coupled directly to the existing 150
Has any one any experience in this type of hook up
Thanks
Les L
I wish to upgrade from a 150kW 4 pole motor to a 330kW 4 pole motor. The application is a wood chipper in a sawmill.
The supply to the MCC this motor will be supplied from is not large enough to support any thing greater than a 250 kW motor.
I am thinking of using a pony to run up the large motor and when at sync DOL the motor.
I am also considering using a second 150kW coupled directly to the existing 150
Has any one any experience in this type of hook up
Thanks
Les L





RE: Pony Motor
RE: Pony Motor
RE: Pony Motor
Both options are potentially valid and worthy of further consideration. However before one can comment with a YES/NO type response some additional information regarding the supply is needed.
When you say the suppy is capable of 250kW, can you please explain whether that determination has been made on the basis of continuous capactity or on starting capacity ie maximum starting/overload current?
Regards,
GGOSS
RE: Pony Motor
I agree with jwerthman especially with starting torque. However, you may have to enhance your supply system to support the present load of 330 KW.
cbarn24050,
ignorant and insulting as usual.
RE: Pony Motor
RE: Pony Motor
We use the pony motor arrangement successfully to bring a 2000HP 3.3kV motor up to running speed prior to energising. This minimises the surge on the 3.3kV network compared with a DoL start.
cbarn24050, what is it you find amusing? Or do you laugh at everything that is beyond you?
RE: Pony Motor
What about buying a diesel generator under an assumption that the MCC feeder is not possible upgrade to 330kW +.
RE: Pony Motor
A pony motor is not most practical approach on a motor of the size you are talking about. A soft starter or reduced voltage starter for the 330kw would probably be less expensive than installing a separate pony motor with an additional starter, wiring, and installation costs. However, as mentioned by scottyuk, a pony motor would work and does make sense on larger motors and at higher voltages. Which brings me to my last point, cbarn24050's comments are inappropriate and unprofessional. I hope he doesn't discourage your creative thinking or discourage others from asking legitimate questions on this forum.
RE: Pony Motor
If the application permits it is possible to use a softstarter to start the first motor. Once the motor is "at speed", a contactor can be used to switch the second motor onto the line.
This still does nothing for you if the MCC is limited to 250kW. Power requirements and limitaions are really independent of starting method selected.
RE: Pony Motor
Therefore, the LesL original posting needs to be elaborated on in this respect.