three phase motor with seven wires
three phase motor with seven wires
(OP)
hi
anyone familliar with this one
i was in a little bit of a Jam so i borrowed a 400 volt 3 phase 5 hp submersible pump from somebody's (dead stock) storeroom.
trouble is the pump cable consists of seven wires and no markings and i can't seem to figure out what all of them are for.
I can identify the ground wire green/yellow - but there is also continunity between it and a solid yellow .
there is also continunity between three leads (about 0.4 ohms) which i believe are the windings (connected in Y)
and the rest I can't figure out - any ideas out there?
thanks
anyone familliar with this one
i was in a little bit of a Jam so i borrowed a 400 volt 3 phase 5 hp submersible pump from somebody's (dead stock) storeroom.
trouble is the pump cable consists of seven wires and no markings and i can't seem to figure out what all of them are for.
I can identify the ground wire green/yellow - but there is also continunity between it and a solid yellow .
there is also continunity between three leads (about 0.4 ohms) which i believe are the windings (connected in Y)
and the rest I can't figure out - any ideas out there?
thanks





RE: three phase motor with seven wires
Two wires will almost certainly be a thermal overload device!!
jeff
www.motors-direct.co.uk
RE: three phase motor with seven wires
It may also be that your motor is set up for Y-Delta starting, so all 6 leads would be brought out. However, you would show 3 pairs as having continuity, not 3 wires.
Any help from the pump mfgr?
"Venditori de oleum-vipera non vigere excordis populi"
RE: three phase motor with seven wires
1 lead will be earth
2 leads will be thermal protection either thermistors 150-160 ohms, or klixons 0.1 ohms
1 lead will probably be a moisture sensor, which should not have continuity with the earth lead, unless the sensor is damp
also be aware that its possible the thermal protection isnt physically connected to the incoming cables, so you may not get any readings between some of the leads.....
RE: three phase motor with seven wires
jammy, has a good points but knowing the unit is only a 5 hp motor. Errol, to clear up your anxieties about the cables..
why shouldn't you open up and see what is really the actual connection. if this motor is made by FLYGT,im sure it has a terminal box provision above its lifting handle so you will easily check and identify the wire connections without opening the inner parts. take note that most submersible pump are oil-filled winding. be sure not to leak out the oil inside.
RE: three phase motor with seven wires
ontheroad