NIRAS VOLUME 5 [5.1] 54
(Robert C. Rosaler, 2004)
Troubleshooting of solid-state motor controls
Repairs and Service The repair of solid-state devices is as varied as are the designs. Before attempting to service any solid-state device, caution should be exercised when removing any printed-circuit boards or solidstate power devices.While designed for use in an industrial environment, they often contain small components or circuits which could be damaged if improperly serviced. Consult the appropriate documentation supplied by the control manufacturer for specific information pertaining to the servicing of a solid-state motor control.
Tools Required for Troubleshooting Typically, no special tools are required to troubleshoot solid-state reduced-voltage motor controls. A digital multimeter or volt-ohmmeter and clamp-on ammeter are usually sufficient. The multimeter can be used to verify incoming and outgoing voltages or measure resistance or voltage drop across the SCRs, while the ammeter is used to measure motor current.
Preventive Maintenance