3 fault indications, Troubleshooting and fault elimination – Lenze 8240 HVAC Series User Manual
Page 79
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Troubleshooting and fault elimination
8-3
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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
LP1
Motor phase failure
D
Failure of one or several motor phases
D
Motor current too low
Check motor cables, check V
min
setting,
connect motor with corresponding power or
adapt motor under C599.
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
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 bec ause of exc essive
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 dimensioning
PTC not connected
Connect PTC or switch-off monitoring
(C0585=3)
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