Chapter 5 Diagnostics and Troubleshooting
FC300
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Fault Display
HoC
OU
LU
OH
OL
oC
CodE
LP
oP
Fault content and
explanation
Inverter severe
overcurrent
Overvoltage
Undervoltage
Inverter overheat
Overload
Overcurrent
Code error
Input phase loss
Output phase loss
Solutions
1, Check whether there is short-circuit or partiall short-circuit
on motor, whether the isolation of output wire is in good
condition;
2, Prolong acceleration and deceleration time;
3, Inverter configuration is not rational, increase the capacity of
inverter;
4, Decrease the set value of torque boost;
5, Check whether there is locked-rotor on motor or mutation on
mechanical load;
6, Whether there is mutation of network voltage;
7, Machine fault, needs factory repair;
8,Excessive DC braking, needs to decrease DC braking
amount.
1,Network voltage is too high, check whether there is mutation
of network voltage;
2, Whether input voltage is wrong;
3,Excessive load inertia;
4, Deceleration time is too short.
1, Check whether input voltage is normal;
2, Check whether there is mutation of load;
3, Check whether the line too far or too thin;
4, Whether there is phase loss.
1,Check whether there is locked-rotor on fan or foreign matter
on cooling fin;
2, Whether the environment temperature is normal;
3, Whether the ventilation space is enough and air convection is
available;
4, Check whether temperature sensor is damaged;
5, Inverter fault, needs factory repair.
1, Check whether inverter capacity is smaller than enough, if
yes, increase the capacity;
2, Check whether there is stuck on mechanical load;
3, Improper V/f curve design, needs redesign;
4,Excessive DC braking time while starting or stopping,
decrease braking time.
1, Acceleration time is too short, needs to be increased
properly;
2, Excessive motor load;
3, Control panel damage, needs factory repair.
Inverter fault, needs factory repair
Check whether there is phase loss or break wire on input
terminal
Inverter fault, needs factory repair
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