Yaskawa YASNAC PC NC Maintenance Manual Manuale Utente Scaricare il pdf (Pagina 178)

The VS-626M5 PC NC Maintenance Manual

4-157

Motor does not rotate

at commanded speed.

Speed reference signal error Check speed reference on operation status display

(U1-02).

Readjust master speed reference function.

Motor speed adjustment error Check motor speed on operation status display (U1-

01) and adjust the speed using control constant C1-

12.

Speed is controlled by P control. Check if PPI signal is input or not on operation status

display (U1-09).

Torque limiting Check whether external torque limit signals TLL or

TLH is input on operation status display (U1-09).

Control PC board fault Replace the control PC board.

Extended accel/decel

time

Soft starter time setting error

(Set time is too long.)

Check the setting of control constant C1-10.

Motor code selection error Check the setting of control constant C1-25 on the

setting list.

Torque limiting Check whether external torque limit signals TLL or

TLH is input on operation status display (U1-09).

Excess load on load machine Check load status on the load factor meter for loss

and inertia moment of the load machine.

Increase the capacity of inverter and motor.

Control PC board fault Replace the control PC board.

Heavy motor noise,

vibration

Inverter output disconnection Check wiring between inverter and motor.

Grounding error of motor or inverter Check continuity of motor and inverter to see if they

are securely grounded.

Malfunction due to noise

(Poor encoder characteristics)

Check that encoder signal lines are separated from

inverter output wiring or other power lines.

Check encoder cable specifications (whether the

cable is a twisted pair shielded wire).

Control constant setting error

(especially speed control propor-

tional gain)

Check control constants on the setting list.

Motor installation error Check for loose mounting bolts.

Unbalanced motor Check if rotor is balanced.

Replace the motor.

Motor fault

(Motor bearing fault, rotor fault)

Run a motor alone to check if noise and vibration are

within specifications.

Replace the motor.

Defective load machine coupling or

centering

Confirm that coupling and centering are appropriate

according to the connection with load machine.

Insufficient strength of load machine Check the load machine for deformations or reso-

nance.

Loose foundation bolts Check for loose foundation bolts on load machine.

Control PC board fault Replace the control PC board.

Motor does not stop. Control signal does not operate. Check that operation signal (FWD or REV) is open on

operation status display (U1-09).

Control PC board fault Replace the control PC board.

Table 4.38: Motor Faults and Corrective Actions (Continued)

Fault Cause Corrective Action

1 2 ... 173 174 175 176 177 178 179 180 181 182 183 ... 300 301

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Yaskawa YASNAC PC NC Maintenance Manual Manuale Utente Pagina 178

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