Units “Stuck” in Party Mode or Checksum Mode
RS-422/485 MDrive products can appear to have a communications failure when it is merely in a mode that prevents it from responding to or echoing back, instructions in Novanta IMS Terminal.
RS-422/485 Communications
Troubleshooting RS-422/485 Communications
Check Hardware and wiring Check power supply and cabling Check cabling and connections from:[ AC Line to DC motor voltage supply. DC supply to Liberty* MDrive. When power is ON, LED 1 on the upper-right of the Liberty* MDrive heat sink should be solid green. Check Communications adapter and cabling – Novanta IMS MD-CC404/5-000 Ensure
Initial Serial Connection
Install the Liberty* MDrive Motion Control Programmer Click the button labeled “Install Motion Control Interface” (1). Follow the prompt dialogs to install the application. When completed the button text will change to “Launch Liberty* MDrive Motion Control Interface” (2). Click to launch the application. The program will open. Click the tab labeled “Terminal1” (3) to
Recirculating currents in RS-422/485 multi-drop systems
Causes The motor power supply input common (GND) is connected internally to the common of the communication port. When two or more units are connected in the party mode, or multi-drop configuration, a “ground loop” is created. This occurs because the common (communication ground) which connects the communication ports of all connected devices is in
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Connecting RS-422 in Party Mode
Configuring the MDrive With a comm converter and the MDrive units you plan to use in Party Mode at hand, perform the following: Connect in single mode RS-422 and initiate communication, download any programs if required. Assign a device name (DN=”<A-Z, a-z or 0-9>”) i.e DN=”A”. Set the party flag to 1 (PY=1). Press CTRL+J