Section 3 Troubleshooting

 

No Motor Operation With AC Drive Fault(continued)

 

 

 

 

 

Operation

 

 

 

Panel

 

 

 

Indication Name

Description and NOTES

Check point

Corrective action

 

 

 

 

Output phase

This function stops the inverter output if one of the

• Check the wiring

• Wire the cables

failure

three phases (U, V, W) on the inverter's output side

(Check the motor for a

properly.

protection

(load side) results in open phase.

fault.)

• Check the setting of

 

 

• Check that the capacity

Pr. 251 "output phase

 

 

of the used motor is not

failure protection

 

 

smaller than the inverter

selection".

 

 

capacity.

 

 

 

 

 

Fan fault

For the inverter which contains a cooling fan, FN

Check the cooling fan for

Change the fan.

 

appears on the operation panel when the cooling fan

a fault.

 

 

stops due to a fault or operates differently from the

 

 

 

setting of Pr. 244 "cooling fan operation selection".

 

 

 

 

 

 

Stall prevention

During acceleration—If a current of more than

Check the motor for use

The acceleration/

(overcurrent)

150% of the rated inverter current flows in the motor,

under overload.

deceleration time may

 

this function stops the increase in frequency until the

 

change. Increase the

 

overload current reduces to prevent the inverter from

 

stall prevention

 

resulting in overcurrent shut-off. When the overload

 

operation level with Pr.

 

current has reduced below 150%, this function

 

22 "stall prevention

 

increases the frequency again.

 

operation level", or

 

During constant-speed operation—If a current of

 

disable stall prevention

 

more than 150% of the rated inverter current flows in

 

with Pr. 156 "stall

 

the motor, this function lowers the frequency until the

 

prevention operation

 

overload current reduces to prevent overcurrent

 

selection".

 

shut-off. When the ~ overload current has reduced

 

Note: The stall

 

below 150%, this function increases the frequency up

 

prevention operation

 

to the set value.

 

current can be set as

 

During deceleration—If a current of more than

 

desired. It is

 

150% of the rated inverter current flows in the motor,

 

factory-set to 150%.

 

this function stops the decrease in frequency until the

 

 

 

overload current reduces to prevent the inverter from

 

 

 

resulting in overcurrent shut-off. When the overload

 

 

 

current has reduced below 150%, this function

 

 

 

decreases the frequency again.

 

 

 

 

 

 

Stall prevention

During deceleration—If the regenerative energy of

• Check for sudden speed

• The deceleration time

(overvoltage)

the motor increases too much to exceed the brake

reduction.

may change. Increase

 

capability, this function stops the decrease in

 

the deceleration time

 

frequency to prevent overvoltage shutoff. As soon as

 

using Pr. 8

 

the regenerative energy has reduced, deceleration

 

"deceleration time"

 

resumes.

 

 

 

 

 

 

PU stop

A stop made by pressing the RESET key of the PU has

• Check for a stop made

• Perform opeartion

 

STOP

by pressing the RESET

correctly.

 

been set in Pr. 75 "PU stop

 

 

STOP

 

 

selection".

key of the operation

 

 

 

panel during external

 

 

 

operation.

 

 

 

 

 

 

This alarm appears if:

 

• Perform operation

 

• The RES signal is on;

 

correctly.

•You attempted to set any parameter value in the external operation mode;

•You attempted to change the operation mode during operation;

•You attempted to set any parameter value outside its setting range.

•You attempted to set any parameter value during operation (while signal STF or STR is ON).

•You attempted to set any parameter value while parameter write is being inhibited in Pr. 77 "parameter write inhibit selection".

9001900

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