Lenze 8240 frequency inverters - Manual (Page 53)

Troubleshooting and fault elimination
UOOu_^MTMO 8-3
L
8.3 Fault indications
Display Fault Cause Remedy
--- No fault - -
EEr External fault (TRIP-Set) A digital input assigned to the TRIP-Set
function has been activated
Check external encoder
H05 Internal fault Contact Lenze
LU Undervoltage DC-bus voltage too low
D
Check mains voltage
D
Check supply module
OC1 Short circuit Short circuit Find out cause of short circuit; check cable
Excessive capacitive charging current
of the motor cable
Use motor cable which is shorter or of lower
capacitance
OC2 Earth fault Grounded motor phase Check motor; check cable
Excessive capacitive charging current
of the motor cable
Use motor cable which is shorter or of lower
capacitance
OC3 Overload inverter during
acceleration or short circuit
Acceleration time too short (C012)
D
Increase acceleration time
D
Check drive selection
Defective motor cable Check wiring
Interturn fault in the motor Check motor
OC4 Overload controller during
deceleration
Deceleration time too short (C013)
D
Increase deceleration time
D
Check the selection of the brake resistor or
connect the brake chopper
OC5 I x t overload Frequent and too long acceleration
processes with overcurrent
Check drive dimensioning
Permanent overload with
I
motor
> 1.05 x I
Nx
OC6 Overload motor Motor is thermally overloaded, for
instance, because of
D
impermissible continuous current
D
Check drive selection
D
frequent or too long acceleration
processes
D
Check the setting under C120
OH Heat sink temperature is higher
than the value set in the
controller
Ambient temperature
T
amb
> +40 °C or +50 °C
D
Allow controller to cool and ensure
ventilation
D
Check the ambient temperature in the
control cabinet
Heat sink very dirty Clean heat sink
Incorrect mounting position Change mounting position
OH3 PTC monitoring (TRIP) Motor too hot because of excessive
current or frequent and too long
acceleration
Check drive dimensioning
PTC not connected Connect PTC or switch off monitoring
(C0585=3)
OH4 Overtemperature unit Inside unit too hot
D
Reduce controller load
D
Improve cooling
D
Check fan in the controller
OH51 PTC monitoring (Warning) Motor too hot because of excessive
current or frequent and too long
acceleration
Check drive selection
PTC not connected Connect PTC or switch off monitoring
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