STEP ET Series - Page 152

Chapter 8 Troubleshooting
Shanghai Sigriner STEP Electric Co., Ltd.
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Error
code
Fault display
Possible causes
Countermeasures
check the capacity of the inverter according
to this performance
Damage to the cooling fan
or foreign objects entering
the cooling system
Check whether the power cord of the fan is
connected properly, or replace the fan with
the same model one and remove foreign
objects
Abnormal cooling fan
Check the cooling fan. Check whether the
cooling fan power supply is correct and
whether it is blocked by dirts.
A failure in the
temperature detection
circuit
Request for maintenance of professional
and technical personnel.
7
Speed
deviation
The acceleration time is
too short
Extend the acceleration time
The load too is large
Alleviate the load
Current limit is too low
Appropriately increase the current limit
value within the allowable range
8
(In
accelerated
running) bus
overvoltage
protection
Abnormal voltage of the
input power
Check the input power supply
Quick start again in motor
high-speed rotation
Start after the motor stops running
(In
decelerated
running) bus
overvoltage
protection
Excessive load moment of
inertia
Use appropriate dynamic braking
components
The deceleration time is
too short
Extend the deceleration time
Brake resistance is too
large or not connected
Connect a suitable brake resistance
(In
constant-spee
d running) bus
overvoltage
protection
Input power exception
Check the input power supply
Excessive load moment of
inertia
Use appropriate dynamic braking
components
Brake resistance is too
large or not connected
Connect a suitable brake resistance
9
Bus
undervoltage
The power voltage is
below the minimum
working voltage of the
equipment
Check the input power supply
Momentary power failure
Check the input power supply. After the
input power supply is normal, reset and
restart
Voltage variation of input
power supply is too large
The connecting terminal
of the power supply is
loose
Check the input wiring
Abnormal internal
switching power supply
Request for maintenance of professional
and technical personnel.
There is a load with high
starting current in the
same power system
Change the power system to meet the
specification value
10
Output phase
loss
Abnormal wiring, missing
connection or
disconnection at the
inverter output side
Check the wiring at the inverter output side
according to the operating instructions to
eliminate the missing connection and
disconnection
Loose output terminal
The motor power is too
small and is below 1/20 of
the maximum applicable
motor capacity of the
Adjust the inverter capacity or motor
capacity