Err 26.0 Over-speed protection fault in panasonic drive

Err 26.0 Over-speed protection fault in panasonic drive means the motor speed exceeded the maximum allowable speed (typically 120% of rated max). 

Cause: Motor speed exceeded the maximum allowable speed (typically 120% of rated max). 
Remedy:

• Check input command frequency/voltage; is the controller sending a burst of pulses?
• Check for "Overshoot" in gain settings (motor springing past target).
• Check wiring of the encoder (incorrect wiring can cause runaway speed).