Emerson Epsilon Eb Digital Servo Drive, 400501-05 installation manual Encoder State

		Diagnostics and Troubleshooting
	High DC Bus Threshold	Low DC Bus Treshold
E Series	440	96
Epsilon	415	60

Encoder State

Certain encoder states and state transitions are invalid and will cause the drive to report an encoder state fault. This is usually the result of noisy encoder feedback caused by poor shielding.

Encoder Hardware

If any pair of complentary encoder lines are in the same state, an encoder line fault is generated. The most likely cause is a missing or bad encoder connection.

Motor Overtemp

This fault is generated when the motor thermal switch is open due to motor over-temperature or incorrect wiring.

Overspeed

This fault occurs in one of two circumstances:

1.When the actual motor speed exceeds the Overspeed Velocity Limit parameter or 150% of motor maximum operating speed. This parameter can be accessed with PowerTools software.

2.If the combination of command pulse frequency and Pulse Ratio can generate a motor command speed in excess of the fixed limit of 13000 RPM, an Overspeed Fault will be activated. In Pulse mode operation and any Summation mode which uses Pulse mode, the input pulse command frequency is monitored and this calculation is made. For example, with a Pulse Ratio of 10 pulses per motor revolution, the first pulse received will cause an Overspeed fault even before there is any motor motion.

Max Following Error

This fault is generated when the following error exceeds the following error limit (default following error limit is .2 revs). With PowerTools you can change the Following Error Limit value or disable in the Position tab.

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