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I have come across two units for rotational inertia, Wr2 and Gd2. both have the same units of measure, could someone clarify which one should I use to calculate the accellartation time of machine rotor. accellerating torque is known.

Does anyone have a list of what the No load current is for motors. from 15kw upto 250kw?? Or what is the normal % you would use to work it out?

Anyone Currently our set up is we have 2 33Kv to 415Kv Tx supplying the plant. When we have a power outage we run on gensets. These gensets are cabled straight into the MCC so do not go through the transformers. What i would like to do is use the transformers as step up Tx's, step the 415 from...

Anyone We are using a VFD on a 250KW motor and it is running at almost full load. motor rated at 418A. when running on the VFD motor will trip everytime when getting near 100%. however on fixed speed it will run just under the 418A rating. I belive this to be the voltage difference when using...

We are using 1500KW 3.3KV motors on our mills. Currently in circuit we are using 123.7uF, 1.905KV, 133KVAr capacitors. With the recent power dips and power outages, we have gone through a number of capacitors, The lead time for these capacitors is up to 24 weeks. What i am after is can i put...

On site we have Sag and Ball mill's. In the starter pannels we have 2x 122.7uF capacitors in circuit for phase out of ballance adjustment. We have just recently lost 2 sets of capacitors, we believe this is due to power fluctations, Power outages and surges. Is there any way we can protect these...

Hi people I am looking for a supplier to give me information on a 3.3KV Synchronous motor which will be used to drive a Mill. Our exsisting one is over 60 years old and am looking to upgrade, preferbly with solid state starter technologly. Do not wish to use liquid resistance starters. If any...

Can anyone help to a site or company which supplies cyanide analysis and control equipment. I am currently using a TAC 2000 unit but am looking to install a new unit, as the TAC200 is to expensive and is not worth us looking at, i am after a alternative system. Any ideas or hints on where to...

I am experienceing some difficulty communicating between the plc and the laptop. I have only just inherited this system, but seems that the softwear we are using is very old (is called sfw50), does anyone know of a updated softwear package to interface with the sy/max 50 plc. if so where can i...

Can any one help me with the setup/calibration of a servo amplifier board, model N.o PPC-1. The board is part of a control circuit for a Sag Mill Speed. It gets a 4-20ma input and regulates a 110-115Vac output to drive a actuator. We are getting no 110V once the speed goes above setpoint. the...

Can any one help me with the setup/calibration of a servo amplifier board, model N.o PPC-1. The board is part of a control circuit for a Sag Mill Speed. It gets a 4-20ma input and regulates a 110-115Vac output to drive a actuator. We are getting no 110V once the speed goes above setpoint. the...

Is there a ruling or something that states you must isloate the power side of the motor to be able to inspect the machanical equipment. We have a SAG mill which at the moment they only lock out the control side to inspect inside the mill. we only lock out the H.V when work on the motor itself is...

What danger's can arise from putting to small of C.T in circuit. We have a motor rated at over 300A full load but only have 250/5 amp current transformers. will these do until we can get the right size. thanks greg

Can someone tell me where i can look up the standards for all earth sizes, with a particular size conductor. (what size earth is needed for a cable)?. also where excatly the groundings should be (one on the motor the other at the switchgear)?. Thankyou