All possible fault and warning types of iNVOEE VFD inverter are concluded in table below. Before seeking for services, users can make self-check in accordance with the prompts in this table and record fault phenomena in detail. If services are required, please contact retailers or the manufacturer.
Faults and handling
Serial No.
Fault codes
Fault types
Possible causes
General handling
0
iNVOE(P.oFF)
Under-voltage
Frequency converters are during energization/deenergization
Normal condition, no handling is required
Under-voltage in power grid
Check input voltage
Plates are damaged
Seek for services from manufacturer
1
Er.ocA
Over-current during acceleration
Acceleration time is too short
Extend acceleration time
Power wiring terminals are loose
Check wiring of power terminals
Main shaft of machine tool is stuck
Remove mechanical faults of main shaft
Machined workpieces are not clamped
Correctly clamp workpieces
Motors are filled with water or damaged
Clean or replace motors
Short circuit between motor cables or between cables and ground
Check and replace motor cables
Input voltage is too low
Check input power source
Power of frequency converters is small and not matching with motors
Choose frequency converters at higher power level
2
Er.ocd
Over-current during deceleration
Deceleration time is too short
Extend deceleration time
Motors are filled with water or damaged.
Clean or replace motors
Short circuit between motor cables or between cables and ground
Check and replace motor cables
Power of VFD inverter is small and not matching with motors
Choose frequency converters at higher power level
3
Er.occ
Over-current at constant speed
Load has large sudden change
Reduce sudden change of load as much as possible
Power wiring terminals are loose
Check wiring of power terminals
Tools are worn
Resharpen tools
Machined workpieces are not clamped
Correctly clamp workpieces
Motors are filled with water or damaged
Clean or replace motors
Short circuit between motor cables or between cables and ground
Check and replace motor cables
Abnormal load
Check load
Input voltage is too low
Check input power source
Power of frequency converters is small and not matching with motors
Choose frequency converters at higher power level
4
Er.ovA
Over-voltage during acceleration
Potential energy load is in power generating state
Reduce acceleration time properly
Input voltage is too high
Check input power source
5
Er.ovd
Over-voltage during deceleration
Deceleration time is too short.
Extend deceleration time
Brake resistors are mismatching
Please use resistors of manufacturer in standard configuration, or reduce parameters [F05.00] properly.
Potential energy loador great inertia load
Use brake units and external brake resistors.
Input voltage is too high
Check input voltage
6
Er.ovc
Over-voltage at constant speed
Great inertia load is in power generating state
Prevent load from being in power generating state or use brake units
Input voltage is too high.
Check input voltage
7
Er.ovI
Input over-voltage
Input voltage is too high
Check input voltage
8
Reserved
Reserved
Reserved
Reserved
9
Er.oHI
Radiator overheating
Cooling fans are damaged
Replace fans
Air flues of radiators are blocked
Clean air flues
Ambient temperature is too high
Lower ambient temperature
Inverter modules are abnormal
Seek for services from manufacturer
10
Reserved
Reserved
Reserved
Reserved
11
Er.oLr
Brake resistor over-load
Resistance or power of brake resistors is not selected properly
Select brake resistors in size compliant with application
Setting of function code for permitted value of usage rate of brake resistors is too small (excessive protection margin for brake resistors)
Increase permitted value of usage rate of brake resistors, which however should not be excessive to lose overheat protection for break resistors
12
Er.CdC
Fault in current detection circuit
Plate connections or modules are loose
Check and reconnect.
Current sensors are damaged
Seek for services from manufacturer
Plates are damaged.
Seek for services from manufacturer
13
Reserved
Reserved
Reserved
Reserved
14
Er.CPU
Electromagnetic interference
Strong electromagnetic interference from other equipment on site
Keep away from interfering equipment or add power filter on input side.
Reenergize during deenergization
Reset and reenergize after complete denergization
CPU plate is damaged.
Seek for services from manufacturer
15
Reserved
Reserved
Reserved
Reserved
16
Er.oLI
Frequency converter over-load
Acceleration time is too short
Extend acceleration time
Load is excessive or gears of machine tools are not proper
Reduce load or lower gears of machine tools or replace frequency converters of higher power
Incorrectly set F02 group motor parameters
Accurately set F02 group characteristic parameters of motors based on motor nameplates
DC braking current is too high
Reduce setting of AC braking current
Power grid voltage is too low
Check power grid voltage
Start motors in rotation
Use the function of start after rotating speed tracking
17
Reserved
Reserved
Reserved
Reserved
18
Er.PLI
Open-phase on input side
Open-phase in R, S and T on input side
Check input voltage and input wiring
19
Er.PLo
Open-phase on output side
Open-phase in U, V and W on output side
Check output wiring and motors
20
Er.EMF
Fault in external equipment
External fault terminals are closed.
Disconnect external fault terminals after handling external faults
21
Reserved
Reserved
Reserved
Reserved
22
Reserved
Reserved
Reserved
Reserved
23
Er.EEP
EEPROM fault
Electromagnetic interference
Keep away from interfering equipment or add power filter on input side
Plates are damaged
Seek for services from manufacturer
24
Er.CIb
Simulation current ACI input wire break
Connection is loose
Check connection and reconnect
ACI wire break setting is not proper
Adjust ACI wire break setting function code
25
Reserved
Reserved
Reserved
Reserved


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