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Troubleshooting 9-9
9.7 Overload Protection
IOLT : IOLT(inverter Overload Trip) protection is activated at 150% of the inverter
rated current for 1 minute and greater.
OLT : OLT is selected when F56 is set to 1 and activated at 200% of F57[Motor rated
current] for 60 sec in F58. This can be programmable.
Electronic
Thermal
• Motor has
overheated.
• Reduce load and/or
duty cycle.
• Load is greater than
inverter rating.
• Change drive with
higher capacity.
• ETH level is set too
low.
• Adjust ETH level to an
appropriate level.
• Drive capacity is
incorrectly selected.
• Select correct drive
capacity.
External fault A
contact input
• The terminal set to “18
(External fault-A)” or
“19 (External fault-B)”
in t1-t8 within terminal.
• Eliminate the cause of
fault in the circuit
connected to external
fault terminal.
External fault B
contact input
Operating
method when
the frequency
command is
lost
• No frequency
command is applied to
V1 and I.
• Check the wiring of V1
and I and frequency
reference level.
Remote
keypad
communication
error
• Communication error
between drive keypad
and remote keypad.
• Check for connection
of communication line
and connector.
EEP: Parameter save error
HWT: Hardware fault
Err: Communication error
COM: Keypad error
NTC: NTC error
• Call Baldor-Reliance
for assistance.
Table 9.2 – Corrective Actions