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108
Error causes
Action to be taken
z
Inverter capacity is too small.
z
Voltage drop due to wiring.
z
Inverter power voltage selection is wrong.
z
A motor of large capacity (11 kW or greater) connected to the same
power system has been started.
z
Rapid acceleration with generator power supply
z
Operation sequence when power is off
z
Defective electromagnetic contactor
z
Check the power capacity and power system.
z
UV display appears when the inverter power is turned off while
operation signal is input. Remove the power after stopping the inverter.
(Set the third and fourth bits of Sn-04 to 01.)
Uv1
OC
z
Extremely rapid accel/decel
z
Motor on/off switching at the inverter output side
z
Short-circuit or ground-fault at the inverter output side
z
Motor of a capacity greater than the inverter rating has been started
z
High-speed motor or pulse motor has been started.
Transistor error may occur. Investigate the error cause, correct it, then restart.
GF
z
Motor dielectric strength is insufficient.
z
Load wiring is not proper.
Check for ground-fault in motor or load wiring.
OV
z
Over voltage
z
Insufficient deceleration time
z
Regenerative load (Motor is turned by the load.)
z
High input voltage compared to motor rated voltage
If braking torque is not proper, extend the decel time or use a braking resistor.
(If braking resistor is already installed, verify that Sn-10, 2nd digit to 1.)
FU
z
Repeated overcurrent protection (OC)
z
Repeated overload protection (OL2) power reset
z
Rapid deceleration in excess excitation (improper V/f characteristic
setting)
z
External noise
Correct the cause, check the main circuit transistor, replace the fuse, then
restart.
OH
z
Defective cooling fan
z
Ambient temperature rise
z
Clogged filter
Replace the cooling fan and clean the filter.
Ambient temperature: 104
℉
(40
℃
) or less for enclosed type
122
℉
(50
℃
) or less for open chassis
OL1
OL2
Overload, low speed operation or extended acceleration time, improper V/f
characteristic setting.
Motor rated current (Pn-19) setting is wrong.
Investigate the cause of overload and review the operation pattern, V/f
characteristic, and motor/inverter capacities. (If inverter is repeatedly reset
after an overload occurs, the inverter may fault. Investigate and correct the
cause of overload.)
OL3 Motor Current exceeds the preset value because of machine error or overload.
Check the use of the machine. Correct the overload cause or set a higher
detection level which is within the allowable range.
EF4
EF5
External fault condition occurred.
Correct the cause of the fault input.
z
External noise
z
Excess vibration or shock
z
CPF 02: Control circuit fault
z
CPF 03: NVRAM (SRAM) fault
z
CPF 04: NVRAM BCC Code error
z
CPF 05: AD converter fault in CPU
z
Check data in parameter setting. Record all data, then set
Pn-00 = 08 for initializing.
z
Turn off power, then turn on again. If error is persistent, contact your
TECO representative.