Hi, ED
Don't just start hooking this Stuff Up, It Can Get Scary, Some slow step's Now, Please !!!
Do you have the encoders wired up, Verify the A B signal's at the Geckos are good, Move the axises to mid point if there hooked up.
Do the Drives "One At A TIME". Gecko usually sets the adjustment pot's to mid point, Probably a good starting point.
The Err/Reset, If Grounded will hold the drive in Fault/Inhibit/No motion, It needs 5 volt to reset the drive (Just long enough to Re-set Fault Led).
If your encoders aren't working properly , Be Prepared to Turn The Power Off, Servo may run Away.
If the Servo Jumps and Faults, The encoder A,B's are Backwards (In dis-agreement with the Motor Polarity/ Direction).
You can swap the A B's Around or Motor Polarity, "Just not Both".
If your Lucky, It will just Reset and Hold Steady.
Don't let the Drives or Servos get to Hot, The Adjustment's Limit, Dampen and Gain are as follows, More or Less.
Limit, Sets the max current to the motor.
Gain, Sets the initial motor current (bottom of the torque curve/holding current/at rest Temperature),
Dampen, Set's the Servo motor response to movement, (Over/Under Shoot of Motor to Encoder Position/Follow Up/Error's in Commanded Position).
Gain and Dampening, It's a Balancing Act, Not set properly, You'll get allot of Opinion's on this.
If the Gain is to high the motor may/will vibrate and needs more dampening.
If the Dampening is to high/Low the motor won't follow it's commanded position moves.
A Scope is nice, Then you can see what's going on, Re-Read the Manual.
Don't get in a Hurry, Just some basics Hear.
Just a Start, Chip