NT 1963 E – 07/2020 _______________________________________________________________ 61
LED K1 relay
Fault
Fault elimination
X4 Open
Phase outage
The controller has built-in phase
monitoring. In case of a mains fault
(fuse blown or mains phase
failure), the device is switched off
with a time lag
(approx. 200 ms).
Function available only if there is
sufficient controller charge.
After switching off, an attempted start-up
is made after approx. 15 s if the supply
voltage is sufficient, until the 3 mains
phases are restored.
Check the mains voltage
X5 Open
Motor jammed
If no speed > 0 is measured
for 8 s of switching, the
“
Motor jammed
”
fault is
triggered.
The EC controller switches off, another
attempted start is made after approx. 2.5
s.
Final shutdown after five unsuccessful
attempted start-ups. Reset then required,
by powering off the mains.
Check whether the motor is running
freely.
X6 Open
IGBT fault
Short-circuit to earth or motor
winding short-circuit.
The EC controller switches off, another
attempted start is made after approx. 60
s
Final shutdown if a fault is detected again
within 60 s
of the second attempted start.
Then reset required, by powering
off the mains.
X7 Open
ZK under-voltage
Switched off if the intermediate
circuit voltage drops below the
set limit value.
An automatic attempted start-up
is made if the intermediate circuit
voltage goes back above
the limit value.
If the intermediate circuit voltage
remains below the limit value for
more than 75 s, a fault message
is generated.
X8 Open
ZK overvoltage
The motor is switched off if the
intermediate circuit voltage
exceeds the set limit values.
Cause: input voltage too high, or
motor generator operating.
An automatic attempted start-up
is made if the intermediate circuit
voltage drops back below the limit
value.
If the intermediate circuit voltage
remains above the limit value
for more than 75 s, a fault message
is generated.
X9 Closed
IGBT cooling break
IGBT cooling break for
approx. 60 s.
Final shutdown after 2 cooling breaks