Specifications

20 Gear Drive, Plymouth Ind. Park, Terryville, CT 06786
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UPGRADING
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Replacing a SD8055 (continued)
Grounding Lug
Connection
A grounding wire from the SD17063’s grounding lug to your system’s ground bus must be installed. See fig-
ure 5.10, Power and Grounding Connections on page 41 for more information.
Improving Upon a SD8055 Installation
The primary advantages of using an SD17063 instead of an SD8055 are:
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Higher torque from the same motor
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No loss in torque when mircostepping the motor due to the SD17063’s RMS current control
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Smoother operation due to Anti-Resonance, Current Loop Gain, and Output Waveform features.
When you were converting switch settings from the SD8055 to the SD17063 you had the choice of setting the
Current Control feature of the SD17063 to RMS or Peak. (SB2-1) The SD8055 uses peak current control
only, so you may have set the Current Control feature to Peak, (SB2-1=1), to match the SD8055. If you are
full stepping the motor, this setting actually has no effect. If you are micro-stepping the motor, including half-
stepping, consider using the RMS control instead. (SB2-1=0) When micro-stepping the motor and using
Peak current control, available low speed torque is 70% of that available when using RMS current control.
After your installation is complete, you should test the system using the procedures given in Step 6: Testing
the System, starting on page 42. Note that you may see a significant increase in high speed torque when using
the SD17063. This additional torque may be helpful, or even needed, for your application. Also consider
reducing the motor current until the torque levels are equivalent to the SD8055’s. The reduction in motor cur-
rent will decrease the motor’s temperature which will prolong its life.