Alpha 6000S series User Manual page 174

Fault
Check whether the power is supplied to the
The motor
power terminals R, S and T and whether
fails to run
the CHARGE LED indicator light is on.
Test whether the voltage of terminals U,
V and W is correct with the rectifier
voltmeter
Check whether the motor has been locked
due to overload
Check whether there is fault display on the
keypad and whether the TRIP light is
flickering
Check whether there is the operation
command
The motor
fails to run
Check whether the anti-reverse selection
setting conflicts with the direction
command
Check whether the terminal operation
signal is disconnected first and then
connected after the fault occurs
Check whether the given frequency voltage
is input
Check whether the operation manner is set
correctly
The motor
Check whether the connection lines of
rotates
terminals U, V and W are correct
reversely
The motor Check whether the connection lines of
rotates but given frequency circuit are correct
cannot
change the
Check whether the load is too large
speed
Check whether the maximum output
The motor
rotating frequency setting value is correct
speed is too
Check whether the voltage drop between
high or too
the motor terminals is too large with the
low
rectifier voltmeter
Check whether the load is too large
Check whether the load variation is too
The motor
large
rotating
speed is
unstable
Check whether there is phase loss with the
during
three-phase power
operation
The frequency giving source is unstable
There is too The bearing is worn, lubrication is poor ,
much noise and the rotor is eccentric
with the
The carrier frequency is too low
motor
173
Table 6-3 Motor fault and corrective measure
Check Content
Chapter 6 Troubleshooting
Corrective Measures
 Be connected to the power supply
 Disconnect the power supply and then be
connected to it again.

Check the power voltage
 Check whether the terminal screws have
been tightened
 Disconnect the power supply and then be
connected to it again.
 Reduce the load and remove the lockout

Search Table 6-1 according to the fault
codes
 Check whether the operating terminal
connection lines and the connection lines
between 24V & PLC are connected
reliably
 Set the reverse allowing or direction
changing command
 The terminal operation signal is
disconnected first and then connected
 Check the given frequency voltage
 Input the correct setting
 Adjust the corresponding connection lines
of terminals U, V and W
 Adjust the function code P2.45

Correct the connection lines
 Reduce the load or increase the
acceleration or deceleration time
 Check the maximum output frequency
setting value
 Check the V/F characteristic value
 Reduce the load

Reduce the load variation
 Check whether there is phase loss with the
connection lines of the three-phase power
 For the single-phase power, connect the
AC reactor to the power supply
 Check the frequency giving source
 Repair the motor
 Increase the carrier frequency