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.