5-1 
 
Chapter 5  Troubleshooting 
 
5-1 Over-Current (oc) 
5-2 Over-Voltage (ov) 
5-3 Low Voltage (Lv) 
5-4 Overheat (oH1) 
5-5 Overload (oL) 
5-6 Keypad Display is Abnormal 
5-7 Phase Loss (PHL) 
5-8 Motor Does Not Run 
5-9 Motor Speed Cannot be Changed 
5-10 Motor Stalls During Acceleration 
5-11 The Motor Does Not Run as Expected 
5-12 Electromagnetic / Induction Noise 
5-13 Operating Environment Condition 
5-14 Affecting Other Machines