The warning and self-diagnosis functions do not operate fault contact output (except OH2 warning
function) and returns to the former operation status automatically when the factor is removed.
The fault display and troubleshooting are provided as shown in the table below.
Error Causes
Action to be taken
Inverter capacity is too small.
Voltage drop due to wiring.
Inverter power voltage selection is wrong.
A motor of large capacity (11kW or greater) connected to the same
power system has been started.
Rapid acceleration with generator power supply
Operation sequence when power is OFF
Defective electromagnetic contactor
Check the power capacity and power system.
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 = 01).
Extremely rapid accel/decel
Motor on/off switching at the inverter output side
Short-circuit or ground fault at the inverter output side
Motor of a capacity greater than the inverter rating has been started
High-speed motor or pulse motor has been started.
Transistor error may occur. Investigate the error cause, correct it, then
restart.
Motor dielectric strength is insufficient.
Load wiring is not proper.
Check for ground fault in motor or load wiring.
Overvoltage
Insufficient deceleration time
Regenerative load (Motor is turned by the load).
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
= 1).
Repeated overcurrent protection (OC)
Repeated overload protection (OL2) power reset
Rapid deceleration in excess excitation (improper V/f characteristic
setting)
External noise
Correct the cause, check the main circuit transistor, replace the fuse, then
restart.
Defective cooling fan
Ambient temperature rise
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
Overload, low speed operation or extended acceleration time, improper V/f
characteristic setting
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.)
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.
Insufficient resistance of braking resistor
Short-circuit or ground fault in braking resistor
Review the resistance of the braking resistor and braking duty cycle.
Change the resistance or increase the inverter capacity.
Frequent operation stop
Long-time continuous regeneration
Rapid deceleration
Shorten deceleration time or review the braking torque and brake duty cycle
(%ED). Use optional braking resistor or braking unit.
External fault condition occurred.
Correct the cause of the fault input. See Un-07 for the state of input signal.
External noise
Excess vibration or shock
CPF 02: Control circuit fault
CPF 03: NVRAM (SRAM) fault
CPF 04: NVRAM BCC Code error
CPF 05: AD converter fault in CPU
CPF 06: option card fault
Err: Parameter setting error
Check data in Sn-01 and Sn-02. Record all data, then use Sn-03 for
initializing.
Turn off power, then turn on again. If error is persistent, contact your
local distributor or TECO representative.
External noise
Excessive vibration or shock
Poor connection
Check data in Sn-01 and Sn-02. Record all data, then use Sn-03 for
initializing.
Turn OFF power, then turn ON again. If error is persistent, contact
your local distributor or TECO representative.
Check for communication cable between communication interface
card (SC-C) and master controller.
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