Section 8: Failures and warnings
Code
Display view
Description
Possible cause
Counteraction
E. 4
Low voltage in DC
circuit
Low voltage in circuit,
absence of one sup-
ply phase.
Check wires and
supply voltage level.
E. 5
Short circuit at the
system output or
power module fault.
Short circuit in elec-
tric motor or motor
power cable.
Disconnect the mo-
tor and check if the
fault persists; if it is
present, contact the
service centre, if not
—check insulation of
motor wires and
windings.
E. 6
Electric motor cur-
rent is too high.
Too intensive start-
up.
A rapid change in
motor load.
Increase motor ac-
celeration time in
par. 1.30.
E. 7
Electric motor
thermal overload.
Operation with a
loaded motor or long
operation with high
loading at low
speeds
Check motor load
(motor current).
Check the paramet-
ers of the motor
thermal model
U. 8
No signal at the
analog input.
When setting the in-
put with "living null"
(2-10V or 4-20mA -
par. 2.40) the signal
is below 1V or 2mA.
Depending on the
setting of par. 3.23,
the warning (U.8) or
failure (E.8) occurs.
Check the configura-
tion of the analog in-
puts, check the con-
nection system
(broken wires etc.)
E. 8
E. 13
Heatsink temperat-
ure is lower than
-10ºC.
The ambient temper-
ature of the freqency-
converter is too low.
Check heating effi-
ciency.
E. 21
The signal of ex-
ternal failure is act-
ive
Depending on the
User's configuration,
Check the status at
the digital input se-
lected as an external
fault.
E. 27
Waiting time for RS
signal is exceeded.
Cable damage, para-
meters of the trans-
mission are incor-
rectly set up.
Check external con-
nection and correct-
ness of RS paramet-
ers.
8.2.
Deleting failure message.
Manual deleting
To delete the failure message press the stop button (
) for at least 2
seconds.
52
TWERD Power Electronics
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