Well to make a long story short, a bone head machinist removed the fan off of our Mazak QT 28's spindle motor because it started to smoke . Eventually the spindle motor got too hot, and the clickson/bimetal switch prevented the windings from going into meltdown. But not before eventually grenading the fr sf-2 18.5kw drive. We have had it repaired, (replacing all 6 igbt's the main board and power supply. Then it had the annoying problem of doing a error 39 on the maztrol, 32 on the drive of over current at 1000rpm in reverse.. Sent the drive out for testing again.. is fine.. So i decided to dive into the spindle motor. Windings ohm out at 2.1 Ohms, and motor meg's at 10Megaohms @ 1000v. I pulled the spindle motor out, and besides being packed with chips (because of the lack of motor fan) i found the encoder pickup had been chewed by the encoder wheel (most likely from expansion and lack of cooling. Now i am trying to find a good replacement pickup for this encoder.. In the manual it only lists the pulse generator as a unit ( which i believe is the amplifier and pickup.) tamagawa seiki TS1860N2. Anyone have some insight???? Even if i had the specs on the pickup.
Mike