Ok I get all the digital stuff, it's the volts ohms and amps that more or less leaves my head spinning.
My controller on my mid 90's Vytek router died. It faults on the pendent during initial startup home.
New Controller: PC Running Mach 3 or EMC2 -> Cambell Combo BOB -> Gecko G203V - Stepper Motors (PK2913-02AA for X and Y, and PK268-03AA for the Z).
The PS was pushing 91V, so I'm replacing the transformer with a slightly smaller one that should produce a steady 68V and not pulse over the 80v Gecko Limit enough to blow the fuses.
Next is the required Resister to control load... the motor specs for the PK2913-02A indicate 2.8 Phase Amps which falls between 2.5 and 3.0. or 26.1K and 35.25K respectively. The Z uses the PK268-03A at 2.1 Phase Amps. So between 2.0 and 2.5 or 18.8k and 26.1K.
So first am I right to swap the transformer to be more conservative. Clearly 91V is above the 80V G203V limit...
Second, for the current set resister, can I use a couple 33k for the X and Y and a 22K for the Z? I have a resister pack obtained from Radio Shack a number of years ago that includes these resisters. This seems likely to be an analog resister controlling the amps to the motor where the intermediate values are likely very close to the actual calculated need, or do I really need to stick with the half amp intervals shown in the manual?