LEESON Micro Series Compact Inverters - Manual (Page 83)

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20.0 TROUBLESHOOTING
The table below lists the fault conditions that will cause the drive to shut down, as well as some possible
causes . Please contact the factory for more information on troubleshooting faults .
NOTE: The drive will not automatically restart after a PWR SAG or a CONTROL fault. Also, if an
OUTPUT fault occurs below 1.5 Hz, the drive will only attempt one restart, after a four minute delay.
If unsuccessful, it will then trip into FAULT LOCKOUT, which will require a manual reset. This is
done to protect the drive in case of a shorted motor.
NOTE 2: In the event of an OVERLOAD fault there is a 3 minute delay before resetting is pos-
sible. This is a requirement of UL508C. The delay is intended to allow time for the motor to cool. If
power is removed when the drive is in an OVERLOAD fault state, then when power is restored the
OVERLOAD fault will still be present and the delay will still be active even is power was removed for
longer than 3 minutes.
FAULT MESSAGES
FAULT DESCRIPTION POSSIBLE CAUSES
OUTPUT Output transistor fault: Output current Phase to ground short .
exceeded 200% of drive rating. Phase to phase short.
FX or AC BOOST set too high .
Bad transistor module (IPM).
LO VOLTS Low DC Bus Voltage fault: DC Low line voltage .
bus voltage below 60% of normal .
HI VOLTS High DC Bus Voltage fault: DC bus High line voltage .
voltage above 120% of normal . Overhauling load .
DECEL rate is set too fast .
HI TEMP Temperature fault: Internal drive Ambient temperature too high .
temperature too high. Fan failure (if equipped).
OVERLOAD Current Overload fault: Output Drive undersized for the
current rating exceeded for too long. application.
Problem with the motor
and/or the driven equipment.
PWR TRAN Power Transient fault: Low line AC line dipped or sagged .
voltage .
PWR SAG Power Sag fault ; Control board voltage Erratic AC line .
below tolerance .
A new control board has been installed Perform a factory reset using
that is different from the previous Parameter 65-PROGRAM .
version . This will update the software
and allow the fault to be reset .
LANGUAGE Language fault: Selected language Defective language EEPROM .
not present. Language EEPROM (U11)
removed after programming .