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Chapter 10 – Trouble shooting
Error
Condition
No voltage can
be measured at out-
puts U, V, and W
The motor
won't start
No voltage can be
measured at outputs
U, V, and W
An optional remote
operator is used.
The motor runs
in the wrong
direction
The motor
won't reach its
normal speed
Possible cause
Does a voltage exist at the terminals L1, N
(NFE models) or L1, L2 and L3 (HFE
models)? If this is the case, is the power
lamp also lit?
Does the LED display on the digital
operator show a trip message (E _ _ )?
Has a run command been issued?
Has a frequency set value been entered
using function F 01 (only when inverter
is operated using the digital operator)?
Have the terminals H, O, and L been
wired correctly when set value is given
by means of a potentiometer?
Have the terminals O and OI been wired
correctly if an external set value is used?
Are the digital inputs configured as
RS or FRS still active?
Has the correct frequency set value
source (A 01) been selected?
Has the correct source for the running
command (A 02) been selected?
Is the motor blocked or is the motor
load too high?
Are the dip switches set correctly?
Have the output terminals U, V, and W
been wired correctly?
Does the connection scheme of the
terminals U, V, and W match the motor's
running direction?
Have the control terminals been wired
correctly?
Has the function F 04 been configured
correctly?
No set value signal is present on
terminals O and OI.
Is one of the multistage frequency
settings being activated?
Is the motor load too high?
10-1
Chapter 10 – Trouble shooting
Remedy
Check terminals L1, L2, L3 (U, V, W).
Switch on the power supply afterwards.
Analyze the cause of the trip message
(also refer to chapter 9 - Messages).
Acknowledge the trip condition by re-
setting the inverter (e.g. by pressing the
RESET key).
Issue a run command by using the RUN
key or the digital inputs FW or RV.
Enter a frequency set value under F 01.
Check for errors in potentiometer wiring.
Check for correct connection of the wires
carrying the set value signal.
Deactivate RS or FRS.
Check the signal on digital input 5
(standard setting = RS).
Correct the A 01 parameter setting,
if necessary.
Correct the A 02 parameter setting,
if necessary.
Reduce the load that the motor drives.
Operate the motor without any load for
testing purposes.
Check if the dip switches are set correctly
if a DOP or DRW is used.
ON
ON
1
4
OFF
OFF
Connect the output terminals U, V, and W
to the motor corresponding to the desired
running direction (generally U, V, and W
in this order cause the motor to run in
forward direction).
Use terminal FW for forward run and RV
for reverse run.
Configure the desired running direction
under F 04.
Check the potentiometer or the external
set value origin and if necessary replace
them.
Note that there is a priority order with the
multistage frequency settings having
higher priority than the set value at inputs
O and OI.
Reduce the motor load because the
overload restriction functions prevents the
motor from reaching its normal speed in
case an overload exists.
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