ABB DASA110 3ASC25H705/7 Communication module

Idle current reduction (ICR) - enables or disables idle current reduction which reduces motor winding current by 50% of its rated value during motor dwell periods. ICR begins 0.1 second after the last input step pulse occurs. This delay can also be set to 0.05 seconds or 1 second using a plug-on jumper. Note: The current will return to 100% at the next step pulse.

using plug-on jumpers 

Step filter - when enabled (jumper installed) rejects noise pulses on step input less than 500hs wide. Useful if maximum step rate is 500 KHz. Enable sense - allows the polarity of the enable input to be reversed. With the jumper installed, the enable input opto-isolator must be driven to enable drive. With the jumper removed, enable input opto-isolator must be driven to disable

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