Shanghai STEP Electric Corporation
Chapter 9 Faults and Solutions
Check the motor and output wiring for loose connections
Acceleration time is too
short
Extend the acceleration time
Increase the limit value in the allowable range
(In
accelerated run
ning)
Bus over-voltag
e protection
Abnormal input
power voltage
The motor is quick restarted
again in high-speed rotation
Stop and restart the motor
(In decelerated
running) bus
over-voltage
protection
Use appropriate braking components
Deceleration time is too
short
Extend the deceleration time
The braking resistor has an
extremely large value or is
disconnected
Connect the appropriate braking resistor
(In constant
speed operation
) bus
over-voltage
protection
Use appropriate braking components
The braking resistor has an
extremely large value or is
disconnected
Connect the appropriate braking resistor
Supply voltage falls
below the
minimum operating voltage
Instantaneous power failure
Check the input power. When the input voltage is
normal, restart after reset
Significant changes in input
power voltage
The power wiring terminal is
loose
Abnormal internal switching
power
Ask professional technical personnel for Ispection
Large starting
current load in the
same power system
Changes the power system to meet the specifications
Abnormal, or ignored
connection or disconnection
in converter output side
connection
Follow the rules and check the converter output side
connections, eliminate missing and disconnection
Electrical power is too
small, 1 / 20 or less of the
maximum applicable
motor capacity in
the converter
Adjust converter capacity or motor capacity
Unbalanced
output three-phase
Check whether the motor wiring is intact
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