Chapter 6 Fault Diagnosis And Solution - Danfoss VFD500 Series Manual

Chapter 6 Fault diagnosis and solutions
6.1 Failure and diagnosis
The VFD500 inverter has perfect protection. If a fault occurs, the inverter will act according to the fault
attribute. For more serious faults, the inverter will directly block the output; for general faults, it can be
configured to stop or continue to operate according to the scheduled stop mode. After the inverter fails,
the fault relay contacts act and the fault code is displayed on the display panel. Before seeking service,
users can perform self-checking according to the tips in this section, analyze the cause of the fault, and
find a solution.
Fault Name
Inverter unit
protection
Over current
during
acceleration
Over current
during
deceleration
VFD500 high performance vector control frequency inverter user manual

Chapter 6 Fault Diagnosis and Solution

Faul
Disp
t
lay
cod
e
1: Motor insulation aging
2: The cable is damaged and
contact, short circuit
3:The distance between motor
Er.
and inverter are too long.
1 SC
4: Output transistor breakdown
5: The internal wiring of the
inverter is loose, or the hardware
is bad.
6:Brake transistor short circuit
1: The output circuit is grounded
or
short circuited.
2: Motor auto-tuning is not
performed.
3: The acceleration time is too
short.
Er.O
4: Manual torque boost or V/F
2 C1
curve is
not appropriate.
5: The voltage is too low.
6: The startup operation is
performed
on the rotating motor.
7: A sudden load is added during
acceleration.
1: The output circuit is grounded
or
short circuited.
2: Motor auto-tuning is not
performed.
Er.O
3: The deceleration time is too
3
C2
short.
4: The voltage is too low.
5: A sudden load is added during
deceleration.
6: The braking unit and braking
resistor are not installed
Possible Causes
111
Solutions
1. Confirm the insulation
resistance of the motor. If
it is turned on, replace the
motor.
2. Check the power cable
of the motor
3. Install reactor or output
filter
4, seeking technical
support
5, seeking technical
support
1: Eliminate external
faults.
2: Perform the motor
auto-
Tuning in cold state
3: Increase the
acceleration
time.
4: Adjust the manual
torque
boost or V/F curve.
5: Adjust the voltage to
normal
range.
6: Select rotational speed
tracking restart or start
the
1: Eliminate external
faults.
2: Perform the motor
auto-tuning.
3: Increase the
deceleration time.
4: Adjust the voltage to
normal
range.
5: Remove the added
load.
6: Install the braking unit