Hi,
Would any of you guys know of dust free shaft grounding for an AC motor, this is needed as we need insulated bearings on NDE and DE but as the motor will be in a clean room dust from contact brush style grounding device is not allowed. I know there are some products such as AEGIS but i have...
Hi,
I am trying to educate myself a bit on Class II, Div I motors and Ex rated motors in general for USA or NEMA land.
Can I ask a few general questions.
Is Class II, Div I similar to Zone 22.
Can Class II, Div I motors be driven by VSDs
I presume the VSD cannot be installed in the field and...
No it’s a centrifugal pump with a foot mounted motor and coupling some of the motors are AEG but quite a lot are supposed to be Nash but they may not be. Reason I can’t say for sure is the plates are corroded so bad they are nearly gone to power and there is nothing visible. We have a plant log...
Hi ScottyUK,
Thanks for the reply, these motors are probably from 1975 on. Some are the brand Nash and are unusual looking but I have not checked the dimensions. I was hoping for general drawing to cross check vs IEC but if you say they are the same then it may not be as difficult as I thought...
Hi
We have some old BRitish Standard Ac Motors and I’m looking for information to allow me to plan on changing them to IEC Motors. I asked locally for the drawings but they did not have anything on them. I would appreciate and drawings or information you can share with me to help with this. I’m...
yes, its when it failed it had heavy wear on that one ring. But 3 days prior when we inspected it all rings were good with even wear, so we are trying to establish why it is failing on one ring. This is the original motor the spare went in and it has the same failure but on a different ring and...
The wear was even across all the slip rings, we know that the motor and slip rings perform well for most of the time as we see no damage until the failure happens so the problem arises quite quickly
the vibration was a typo its 1.2mm sec
F.E.G
Waross you may be on to something. We sent the brushes away to be analysed and they found a trace of a type of silicone/rubber compound we don't know where this came from.
The Elec guys tell me they checked that the contractors are working properly and the starter is out of the system when the...
Hi Muthu,
we recently fitted CT's to measure the motor amps, the OEM no longer supplies the brushes for this motor but we are using the same grade brush as the original and they have been working well up to this problem.
F.E.G
Hi Guys
Thanks for initial replies.
This motor has been working since Jan 2000, its a slip ring motor started by the same liquid resistance starter and the sequence of starting has not changed over the years. Its a fixed speed all the time. its starts very infrequently, it runs normally for...
Hi Eng-Tips
looking for some help on MV Motor, the nameplate gives the following information
2900Kw, 991 Rpm, 11000 V Y, 991 rpm, 50 hz .085 cos, Rotor 1375 A
This motor has been working fine for 15 + years I'm told, I have only started working in this plant.
In the last 2 years, the motor...
Thanks for all the replies. It is still a job that we are looking into, we are finding it very difficult to get information from the motor manufacturer.
If the job goes ahead I will let you know but I am thinking of
250kw Siemens Ac Variable Speed Drive built in IP54 mild steel enclosure...
Hi Guys,
I am wondering what to look out for when replacing a DC Shunt wound motor. We have an application where we have a 150Hp Fincor Imo Motor 950-1700 Rpm 508ATZ Field V 150-300V Arm Volts 500. This is lifting a product from ground to roof similar to an elevator. It does not have re-gen as...
Mark,
we are looking at the Siemens 3RW44 high feature rated at 356 amps 400V with torque control. We think this should be a good option, what do you think of these or have you ever used them.
I would like to thank everyone so far as there has been good interest n this topic.
FEG
Thanks for the replys.
The motor is a very old (70's) 110Kw 986rpm 380V GEC motor and looks like a std sq cage motor. We dont have any info on the cureves and so on. The coupling is a very old one too and it is probably a Fluidrive. This coupling did not blow up, it has happened else where in...
