EF / EF1 External Fault fault in delta drive

EF / EF1 External Fault fault in delta drive troubleshooting

Description

The EF fault is not an internal drive problem. It is triggered by an external input signal wired to the drive's multi-function input terminals (MI1, MI2, etc.). The drive has been programmed to stop when this specific circuit opens or closes.

Causes

1. Emergency Stop Pressed: An E-Stop button wired to the drive has been pushed.
2. Sensor Trip: An external sensor (vibration, pressure, auxiliary contact of a breaker) wired to a digital input has triggered.
3. Broken Wire: The control wire connected to the "External Fault" terminal is broken or loose.

Solution

Investigate external controls:
1. Check Inputs: Look at the drive display or LEDs to see which input (MI1, MI2, etc.) is active. Consult the wiring diagram to see what device connects there.
2. Reset Device: Reset the external E-Stop or sensor.
3. Check Logic: Verify if the input is set to N.O. (Normally Open) or N.C. (Normally Closed) in parameters (Pr. 02-xx) and ensure it matches the physical switch.