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Section 1
General Information
5-8 Troubleshooting MN722
Table 5-3 Converter Section Troubleshooting Continued
INDICATION POSSIBLE CAUSE CORRECTIVE ACTION
Over Current FLT Possible converter transistor failure. Check transistors for shorted junctions.
Incorrect inductance set in Line
Inductor parameter.
Check inductance parameter value.
Overload FLT Drive overloaded. Verify proper sizing of control and motor.
PWR Base FLT Incorrect phase connections. Check connections for proper phasing of EK drive components as
detailed in Section 3 of this manual.
Excessive current draw.
Power device saturated.
Disconnect motor wiring and retry test. If fault remains, call Baldor.
Electrical noise from DC coils. Install flyback diodes (reverse biased 1N4002 or equivalent)across all
external DC relay coils..
Electrical noise from AC coils. Install RC snubbers on all external AC coils.
Sync To Line Incorrect phase connections. Check connections for proper phasing as detailed in Section 3 of this
manual.
Incorrect frequency detected at
startup.
Check incoming line voltage and frequency.