Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 224)

Troubleshooting
Chapter 10
10Ć12
unintentionally. In such cases, monitoring the command block while
executing the ladder diagram program can sometimes help isolate the
problem.
10. With the axis in hardware stop, there should be no axis motion and
zero following error. If there is axis motion or following error,
assure that someone has correctly integrated the axis. (Refer to
chapter 9.)
11. After system power-up, the axis jogs only at low speed until the
1771-ES expander receives an encoder marker signal. If high jog
speed is initially selected thru the command block, the axis moves at
low speed until a marker is detected, then accelerates to high jog
speed.
In this chapter, we gave you information that should help you
troubleshoot your system. As you gain experience with your system, the
process of troubleshooting should become easier for you.
Summary