Lenze MCH Series - Manual (Page 80)

76 13435744_EDBMH01_v13
20 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
In the event of an OVERLOAD fault there is a 3-minute delay before
resetting is possible. This is a requirement of UL508C. This delay is
intended to allow time for the motor to cool. If power is removed when in
an OVERLOAD fault state, when the power is restored the OVERLOAD
fault will still be present and the delay will still be active even if power
was removed for longer than 3 minutes.
FAULT MESSAGES
FAULT DESCRIPTION POSSIBLE CAUSES
OUTPUT Output transistor fault:
Output current exceeded 200% of
drive rating.
Phase to ground short.
Phase to phase short.
FX BOOST set too high.
Bad transistor module (IPM).
LO VOLTS Low DC Bus Voltage fault:
DC bus voltage below 60% of
normal.
Low line voltage.
HI VOLTS High DC Bus Voltage fault:
DC bus voltage above 120% of
normal.
High line voltage.
Overhauling load.
DECEL rate is set too fast.
HI TEMP Temperature fault:
Internal drive temperature too high.
Ambient temperature too high.
Fan failure (if equipped).
OVERLOAD Current Overload fault:
Output current rating exceeded for
too long.
Drive undersized for the
application.
Problem with motor and/or driven
equipment.
PWR TRAN Power Transient fault:
Low line voltage.
AC line dipped or sagged.
PWR SAG Power Sag fault:
Control board voltage is below
tolerance.
Erratic AC line.
A new control board has been
installed that is different from
the previous version.
Perform a factory reset using
Parameter 65-PROGRAM.
This will update the software
and allow the fault to be reset.