Trouble shooting
Page 51 / 52
11. Trouble shooting
Error
Condition
Possible cause
Remedy
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?
Check terminals L1, L2, L3 (U, V, W).
Switch on the power supply afterwards.
Does the LED display on the digital
operator show a trip message (
E _ _
)?
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).
Has a run command been issued?
Issue a run command by using the RUN
key or the digital inputs FW or RV.
Has a frequency set value been entered
using function
F 01
(only when inverter
is operated using the digital operator)?
Enter a frequency set value under
F 01
.
Have the terminals H, O, and L been wired
correctly when set value is given
by means of a potentiometer?
Check for errors in potentiometer wiring.
Have the terminals O and OI been wired
correctly if an external set value is used?
Check for correct connection of the
wires carrying the set value signal.
Are the digital inputs configured as
RS or FRS still active?
Deactivate RS or FRS.
Check the signal on digital input 5
(standard setting = RS).
No voltage can
be measured at out-
puts U, V, and W
Has the correct frequency set value
source (
A 01
) been selected?
Has the correct source for the running
command (
A 02
) been selected?
Correct the
A 01
parameter setting,
if necessary.
Correct the
A 02
parameter setting,
if necessary.
The motor
won’t start
No voltage can be
measured at outputs U,
V, and W
Is the motor blocked or is the motor
load too high?
Reduce the load that the motor drives.
Operate the motor without any load for
testing purposes.
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?
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).
Have the control terminals been wired
correctly?
Use terminal FW for forward run and RV
for reverse run.
The motor runs
in the wrong
direction
Has the function
F 04
been configured
correctly?
Configure the desired running direction
under
F 04
.
No set value signal is present on
terminals O and OI.
Check the potentiometer or the external
set value origin and if necessary replace
them.
Is one of the multistage frequency
settings being activated?
Note that there is a priority order with the
multistage frequency settings having
higher priority than the set value at
inputs O and OI.
The motor
won’t reach its
normal speed
Is the motor load too high?
Reduce the motor load because the
overload restriction functions prevents
the motor from reaching its normal
speed in case an overload exists.