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What are the probable causes of E-19 fault on Altivar 212 drive.

E19 is a CPU communications error (Communication error between control CPUs).
- Verify the internal cable connection between the boards.
- Check the connection to the ground.
- For the test, remove all the control wiring and cycle power. If the E19 fault goes away, reconnect one control wire at a time until the E19 fault appears again to see if a      control wire is shorted. 
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