Installation manual

Diagnostics and Troubleshooting

Diagnostic Display

The diagnostic display on the front of the drive shows drive status and fault codes. When a fault condition occurs, the

drive will display the fault code, overriding the status code.

The decimal point is “On” when the drive is enabled and the stop input is not active. This indicates that the drive is ready

to run and any motion command will cause motion. Motion commands will not cause motion unless you are Ready (R)

and the decimal point is “On”.

Fault Codes

A number of diagnostic and fault detection circuits are incorporated to protect the drive. Some faults, like high DC bus

and amplifier or motor over temperature, can be reset with the Reset button on the front of the drive or the Reset input

function. Other faults, such as encoder faults, can only be reset by cycling power “Off” (wait until the diagnostics display

turns “Off”), then power “On”.

The drive accurately tracks motor position during fault conditions. For example, if there is a “Low DC Bus” fault where

the power stage is disabled, the drive will continue to track the motor’s position provided the logic power is not

interrupted.

Display Indication Status Description

Brake Engaged (Output

“Off”)

Motor brake is mechanically engaged. This character will only

appear if the Brake output function is assigned to an output line.

Disabled Power Stage is disabled.

Ready

The Epsilon or FM-2/MDS drive system is functioning normally and

is ready to execute a motion command.

Torque Mode Analog Torque Mode Operation

Velocity Mode Analog Velocity Mode Operation

Pulse Mode Pulse Mode Operation

Stop or Travel Limit Decel

Stop or Travel Limit Decel in progress. The ramp is displayed while

decelerating, and the display will go back to normal after completing

the decel ramp.

RMS Foldback Motor torque is limited to 80 percent.

Stall Foldback

(EN drive only)

Drive output current is limited to 80 percent of drive stall current.

Ready to Run Drive enabled, no

Stop input.

Epsilon EP-B Base Drive Reference Manual