Fan Cooling Fan Lock fault in delta drive

Fan Cooling Fan Lock fault in delta drive troubleshooting

Description

The Fan fault is specific to drives that have feedback wires on their cooling fans (usually 3-wire fans). The drive expects a pulse signal from the fan indicating it is spinning. If the drive sends power to the fan but receives no tachometer pulse, it trips to prevent overheating.

Causes

1. Fan Jammed: Debris, dust bunnies, or a foreign object has physically stopped the fan blades.
2. Fan Aging: The bearings are worn out, causing the fan to run slower than the threshold speed.
3. Disconnected Wire: The small connector plug for the fan on the control board is loose.
4. Board Fault: The transistor driving the fan power has failed.

Solution

Maintenance required:
1. Visual Check: Look at the fans. Are they spinning? Is one stopped?
2. Clean: Use compressed air to clean the fan blades.
3. Replace Fan: If the fan is clean but not spinning (or spinning slowly/noisily), replace it. Note: You must use a Delta-compatible fan with the feedback/tacho wire, or the fault will persist.
4. Parameter Bypass: For emergency temporary operation, some models allow disabling "Fan Lock Detection" in the protection parameters, but monitor temperature closely.