Rocking the old school speed control. I dig that. You don't see too many DC drives anymore. Stupid simple, dead reliable and loads of torque all the way down 'till they're on their knees just about to stall.
LOL!
"If it ain't broke.."
Spoiled in my youth. Fifty-inch converted Niles cone-head. Fifty HP Dee Cee motor. 10 or 11 inch wide Morse "silent" chain drive.
Whom ever wudda thunk that running that old Dinosaurian would make some weak soul out in Walla Walla Washington go clear TF out of his mind? Well. OK. It
was an awfully dam' short TRIP!
See the Reliance "white paper" on that "just about to stall". Their lab research proved 4 to 9 TIMES "nameplate" torque AT locked-rotor.... if but only for 90 seconds 'til commutator segment "wedging".
Dinosaur Current cannot "slip".
Move the load
OR trip a supply-side protective device or limit-point.
ELSE die trying.
Simple as that.
Each 10EE has a spare "nominal" 230 VDC motor. Armature run @ up to 275 VDC, 115 VDC Field bumped to as high a 140 VDC as well.
Motor is rated around 12 FLA @ 230 VDC ,115 VDC Field. SSD drives are set to allow 90 seconds @ 275 VDC &
24 A before throwing a flag on the play. The SSD sees that as a roughly 9 HP limit, energy-wise.
Hog with a 10EE?
Nossir. No need. Got a larger 7 HP HBX-360 if need be.
All that is there simply for more stable regulation under load.
Ergo I'm good with the old "3 HP" large-frame. The 5 HP ones were not servo-smooth "Type T".
Got lots more Reliance RPM III in 180 VDC windings, 1 1/2 HP to 5 HP... and bought-NEW KB drives for them a'settin' on the shelf for the NEXT "projects".
- Second go at modifying the Kasto PHS presently in-work.
- Walker-Turner DP "owed" sumthin' better than step-pulleys.
DC
Drives are easy. No capacitors to age-out.
But the MSRP on a Reliance Type T
motor? A 5 HP starts at around 11 grand.
So I hoard the "NOS" and pro-rebuilt, not used since DC motors! Virgin wires never yet terminated all but a couple of them.
Meanwhile the Reeves drives ain't all THAT broken, either, and I LIKE the PIV-Werner-Reimers..so...