Emerson P/N 400518-02 User Manual

110

Epsilon EP-I Indexing Drive and FM-2 Indexing Module Reference Manual

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.

The +/- Limit faults are automatically cleared when the fault condition is removed. The table below lists all the fault codes 
in priority order from highest to lowest. This means that if two faults are active, only the higher priority fault will be displayed.

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.

Flash Invalid

Reprogram the Flash

Yes

Drive Overtemp
(Epsilon drive only)

Allow Drive to Cool down,
Cycle Power or Cycle 
Logic Power

Yes

Power Up Test 

Cycle Power or Cycle 
Logic Power

Yes

NVM Invalid

Reset Button or Input Line

Yes

Invalid Configuration

Reset Button or Input Line

Yes

Power Module

Reset Button or Input Line
Cycle Logic Power (MDS)

Yes

High DC Bus 

Reset Button or Input Line

Yes

Low DC Bus 

Reset Button or Input Line

Yes

Encoder State

Cycle Power or Cycle 
Logic Power

Yes