= Connecting a Pacific Scientific N31HRHJ-LNK-NS-00 (N31 Series) NEMA34 stepper motor to a Copley Stepnet =
[[Image(http://factoryswblog.org/wp-content/uploads/2008/PowerPac-2.jpg)]]
[[Image(http://factoryswblog.org/wp-content/uploads/2008/PowerPac-1.jpg)]][[BR]]

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||