Frequency converters are designed with self-diagnostic circuitry to isolate fault conditions and activate display messages which greatly simplify troubleshooting

and service. The operating status of the frequency converter is displayed in real-time. Virtually every command given to the frequency converter results in some

indication on the Keypad display. Fault logs are maintained within the frequency converter for fault history.

The frequency converter monitors supply and output voltages along with the operational condition of the motor and load. When the frequency converter issues

a warning or alarm, it cannot be assumed that the fault lies within the frequency converter itself. In fact, for most service calls, the fault condition will be found

outside of the frequency converter. Most of the warnings and alarms that the frequency converter displays are generated by response to faults outside of the

frequency converter. This service manual provides techniques and test procedures to help isolate a fault condition whether in the frequency converter or elsewhere.

Familiarity with the information provided on the display is important. Additional diagnostic data can be accessed easily through the Keypad.

2.2 Operating the Frequency Converter

2.2.1 Operation and Programming Through the Keypad

The Keypad is the user interface to the controller.

The Keypad has several user functions: to start, stop, and control motor speed when in local control along with displaying operational data, warnings and cautions,

as well as programming controller functions, and to manually reset the controller after a fault when auto-reset is inactive.