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Appendix 4 Troubles and Solutions
Troubles and Solutions
Trouble
Check points
Motor remains stopped
Check the
Main
circuit
• Check that a proper power supply voltage is applied.
• Check that the Power Lamp is lit.
• Check that the motor is connected properly.
Check the
load
• Check that the load is not too heavy.
• Check that the shaft is not locked.
Check the
parameter
settings
• Check that the starting frequency (P.13) setting is not
greater than the target frequency.
• Check that the operation mode (P.79) setting is correct.
• Check that the maximum frequency (P.1) is not set to 0.
• Check that the reverse rotation prevention (P.78) is not
selected.
• Check that the bias and gain (P.194~P.197) setting is correct.
• Check that the frequency jump (P.91~P.96) setting is correct.
Check the
control
circuit
• Check that the output stop signal (MRS) is not on. (The
related parameter is P.80~P.84, P.86.)
• Check that the reset signal (RES) is not on. (The related
parameter is P.80~P.84, P.86).
• Check that the external thermal relay does not operate.
• Check that the ALARM lamp is off and the reset is not
executed.
• Check that voltage/current start signal is input.
• Check that the signal STF/STR is correct.(The related
parameter is P.80~P.84, P.86.)
• Check that wiring for the control circuit is ok.
Motor rotates in opposite
direction
• Check that the phase sequence of output terminals U, V and W is
correct.
• Check that the start signals (STF and STR) are connected properly.
Speed does not increase.
• Check that the load is not too heavy.
• Check that the stall prevention level (P.22) setting is correct.
• Check that the torque boost (P.0) setting is correct.
• Check that the maximum frequency (P.1) setting is correct.
Acceleration/ deceleration
is not smooth
• Check that the acceleration/ deceleration time (P.7, P.8) settings are not
too short.
• Check that the acceleration/ deceleration pattern (P.29) setting is correct.
• Check that the voltage/current input signal is affected by noises.
Motor current is large
• Check that the load is not too heavy.
• Check that the torque boost setting is not too large.
• Checher whether the torque boost (P.0) is set too large.
Speed varies during
operation
• Check that the frequency setting signal is not affected by noise.
• Check that the load is not varying.
• Check that the wiring length for the main circuit is correct.