Burning contactors
Burning contactors
(OP)
I have an 36 volt electrical Hyster standup lift. The lift has two elctric motors, one for movement of the lift the other is movement of the mast. The contactors for the mast motor completely burn out in 7 - 10 days. I am unable to find a reason for this. There is minimal arcing on the break of the contactors, less than the contactors for the drive motor. Battery has been removed and load tested by manufacturer. Motor has been removed and bench tested by an outside company. All connections are clean and corrosion free. Amp draw under full load is within specifications. Hyster repairman ran up a bill of over $1000 replacing parts. Still having the same problem. Does anyone have any ideas?





RE: Burning contactors
RE: Burning contactors
old field guy
RE: Burning contactors
Most operators jog themselves into position, this generally exceeds the Start/Stop duty cycle. Builds up heat and current, the weakest link will suffer from this.
So instrument1717 may have a point.
RE: Burning contactors
JRaef.com
"Engineers like to solve problems. If there are no problems handily available, they will create their own problems." Scott Adams
For the best use of Eng-Tips, please click here -> FAQ731-376
RE: Burning contactors
RE: Burning contactors
The other thing is that the hydraulics could have a restriction so the motor always starts against head pressure or the head pressure builds in only a revolution or so. This is the one area you have not had tested and I have seen this kind of problem with regard to the hydraulics.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Burning contactors
respectfully
RE: Burning contactors
btw...i am talking about sets of 14 starters
RE: Burning contactors
http://
http://www.telemecanique.com/en/search/index.htm and enter cv1 cv3 bar in the search bar for a load of hits. Doesn't work too well in Firefox - use IE6 instead.
The Siemens online catalog is so awful that I'm not wading through that mess looking for their contactors - the paper CA 01 catalogue is a better bet if you can get a copy.
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