Sutter Instrument Lambda 10-3, Operation Manual

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LAMBDA 10-3 OPERATION MANUAL – REV. 3.03 (20110829)
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position an external sensor must be added. Absolute position only needs to be determined
once so long as the subsequent moves occur without errors.
Correct operation of stepping motors, which is outlined above, is not always obtained. If the
motor lacks the torque to accelerate and decelerate the load at the rate indicated by the
control electronics, the resulting move may differ from that commanded by the control
electronics. For instance, if enough external force is applied, the motor shaft may be rotated
even though the command signal has not changed. For small rotations (less than 3.6
degrees), the motor shaft will return to the correct position if the force is removed. For larger
rotations, the shaft will stop at the nearest of the 50 correct positions for that command
signal when the external force is removed.