Troubleshooting  189 
Causes of the error and its countermeasures 
Illegal parameter (PMSTPEN1) 
The parameter setting is illegal 
Illegal parameter (PMSTPEN2) 
The parameter setting is illegal 
No battery voltage (robot) 
Replace the battery and set the origin. 
For more information about the replacement procedure, refer   
to the separate volumes, "Instruction Manual/Robot Arm Setup to 
Maintenance". 
Battery voltage low (robot) 
The battery will be spent soon. 
Replace the battery. 
For more information about the replacement procedure, refer   
to the separate volumes, "Instruction Manual/Robot Arm Setup to 
Maintenance".