Chapter 8 Troubleshooting
ET/EP/EH Series Intelligent Flexible Driver Manual
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Chapter 8 Fault checking
This chapter gives a detailed description of the inverter fault, fault code, content, causes and
countermeasures, and gives an analysis process of various failures during motor debugging and
operation.
◎
Maintenance operation should be carried out after the input power supply is
disconnected for 10 minutes. At this time, the charging indicator is completely off
or the DC bus voltage is lower than 24VDC.
Otherwise, there is a risk of electric shock.
◎ Never modify the inverter by yourself.
Otherwise, there is danger of electric shock and personal injury.
◎ Please contact professional electrical engineers for maintenance. Do not leave wire
ends or metal objects inside the inverter.
Otherwise, there is a risk of fire.
◎ Do not change the wiring and disconnect the terminal when the power is on.
Otherwise, there is a risk of electric shock.
8.1 Protection and inspection functions
See Table 8.1 Fault Table for the fault causes and countermeasures corresponding to the fault codes
of inverter.
Table 8.1 Fault Table
Module
overcurrent
protection
Overvoltage at DC
terminal
Check the power supply of the power grid
and check whether the high inertia load
stops quickly without dynamic braking
Short circuit in the
periphery
Check whether the motor output wire is
short connected and whether it is short
connected to ground
The output has a phase
gap
Check whether the motor and output wire
become loose
Check whether the encoder is damaged or
whether the wiring is correct
Poor or damaged
hardware contact
Request for maintenance of professional
and technical personnel.
Internal connector of
inverter becomes loose
Request for maintenance of professional
and technical personnel.
The power circuit parts
are overheated due to the
problem of cooling fan or
cooling system.
Check the cooling fan. Check whether the
cooling fan power supply is correct and
whether it is blocked by dirts.
Warning: The inverter operation must be started after clearing the fault
cause to avoid damage to IGBTs.
Excess environment
temperature
Reduce the environment temperature and
strengthen ventilation and heat dissipation
Keep the ambient temperature below 40° or
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