Connecting a Pacific Scientific N31HRHJ-LNK-NS-00 (N31 Series) NEMA34 stepper motor to a Copley Stepnet
The PacSci (now owned by Danaher) N31HRHJ-LNK-NS-00 is an out of production single stack NEMA34 bipolar parallel stepper motor with a single shaft. It has 200 steps per revolution. Its holding torque is 665 oz-in.
Connecting it to a Copley Stepnet is quite easy (no encoder or hall sensors to worry about).
| N31 Signal | N31 Wire Color | Stepnet Connector | Stepnet Pin | Stepnet Signal |
| Frame Ground | Green/Yellow | J2 | 1 | Frame Ground |
| B- | Yellow | J2 | 2 | B- |
| B+ | Red | J2 | 3 | B+ |
| A- | Orange | J2 | 4 | A- |
| A+ | Black | J2 | 5 | A+ |
CME2 has a dialog where you should enter the specifications for the stepper motor. I do not have an authoritative source for its specifications; they are at least somewhat different from its successors. I did find a web page with some values (16.2 Ohm phase resistance, 0.86A phase current, 138mH phase inductance), but I'm not sure I believe them. My measured phase resistance quite different.
I found two current PacSci motors which appear to have similar specifications. Here are their specifications for bipolar parallel operation:
| N31HRFL-LNK-NS-00 | N31HRFK-LNK-NS-00 | ||
| Holding Torque | 650 | 665 | oz-in |
| Rated Current/Phase | 8.6 | 6.6 | Amps |
| Phase Resistance | 0.18 | 0.29 | Ohms |
| Phase Inductance | 1.4 | 2.6 | mH |
| Detent Torque | 18 | 18 | oz-in |
| Thermal Resistance | 2.7 | 2.7 | Deg C/Watt |
| Rotor Inertia | 0.0202 | 0.0202 | oz-in-sec2 |
