Fault Analysis
-73-
Problem
Check points
Motor does not rotate
Main circuit
Voltage at input termianls R
、
S
、
T are normal?
Whether is the motor wired correctly?
Load side
Load too heavy?
Motor locked?
Operator panel
Starting frequency setting too high (F1103)?
Operation start frequency (F1104) setting too high?
Operation command selected for control by external signal (F1102=2)?
Upper frequency limit set too low (F1007
）
?
2
nd
upper frequency limit(F1316)and 3
rd
upper frequency limit selected
by multi-function input signal are setting too low?
Checking whether is no setting for the direction of rotationof motor (F1109)
Input signal
Whether operation signals
（
FR
、
RR
）
is input
？
FR and RR signals are input simultaneously?
Idle run stop signal (MBS)?
Analog frequency for frequency setting is zero?
Rotation direction
reversed what it should
be.
Wrong wiring of output U
、
V
、
W terminals?
Wrong wiring of forward
、
reverse?
Rotation speed does
not increase
Upper frequency limit (F1007) activated?
Output current limiting function activated?
F1701 setting too low?
Torque increased is too high (F1004)?
Load too heavy?
Rotation is not stability
Load fluctuating?
Frequency setting (analog) signal fluctuating?
Whether is correct setting for the capacity of Inverter ; number of poles
and capacity of motor under senslorless speed control mode?
Unstability during
acceleration/deceleration
Setting time for accleration/deceleration too short?
Output current limiting function activated?
Load too heavy?
Motor heating up
Wrong setting for V/f Mode?
Torque compensation too hight?
Rotation speed changed
abnormally during
operation
Whether is the load fluctuating?
Output current limiting function activated
F1701 setting too low?
No display on the surface of
operator panel
Voltage at R
、
S
、
T terminal are normal?
Whether the connection between Inverter and operation panel is the standard
