English (GB)
9
4 Mains phase loss
Missing phase, or the supply voltage unbalance is
too high.
Re-establish the voltage supply to CUE
according to the nameplate.
If the fuses blow again or the alarm cannot
be reset, contact Grundfos Service.
• Check for unbalance between the phases
by reducing the load.
If the fault disappears by reducing the
speed to 30 %, the cause is unbalance.
• Check and tighten all supply terminals.
• Contact the electricity supply authorities.
CUE can operate with phase failure and
unbalance up to a load of 30 to 40 %.
See section 4.1 Checking the rectifier, static
test.
W/A
5
DC link voltage
high
The intermediate circuit voltage (DC) is higher than
the high voltage warning limit. The limit is
dependent on the drive voltage rating. The
adjustable frequency drive is still active.
Contact Grundfos Service. W
6
DC link voltage
low
The intermediate circuit voltage (DC) is lower than
the low voltage warning limit. The limit is dependent
on the drive voltage rating. The adjustable
frequency drive is still active.
Contact Grundfos Service. W
7 DC overvoltage
If the intermediate circuit voltage exceeds the limit,
the adjustable frequency drive trips after a time
delay.
• Enable the overvoltage control function in
parameter 2-17.
• Extend the ramp deceleration time in
parameter 3-42.
• Increase parameter "14-26 Trip Delay" at
"Inverter Fault".
W/A
8 DC undervoltage
If the intermediate circuit voltage (DC) drops below
the undervoltage limit, the adjustable frequency
drive trips after a fixed time delay. The time delay
varies with unit size.
• Check that the supply voltage matches
the drive voltage.
• Perform an input voltage test.
• Perform a soft-charge circuit test.
W/A
9
Inverter
overloaded
The adjustable frequency drive is about to cut out
because of an overload (too high current for too
long). The counter for electronic, thermal inverter
protection gives a warning at 98 % and trips at 100
%, while giving an alarm. The adjustable frequency
drive cannot be reset until the counter is below 90
%.
The fault is that the adjustable frequency drive is
overloaded by more than 100 % for too long.
• Compare the output current shown on the
operating panel (parameter 16-14) with
the drive rated current (parameter 16-36).
• Display the Inverter Thermal (parameter
16-35) on the operating panel, and
monitor the value. When running above
the drive continuous current rating, the
counter should increase. When running
below the drive continuous current rating,
the counter should decrease.
• Set the Function at Inverter Overload in
parameter "14-61" to "Derate".
See the derating section in the CUE data
booklet for more details if a high switching
frequency is required.
W/A
10
Motor overload
temperature
According to the electronic thermal protection
(ETR), the motor is too hot.
Select whether the adjustable frequency drive gives
a warning or an alarm when the counter reaches
100 % in parameter 1-90 Motor Thermal Protection.
The fault is that the motor is overloaded by more
than 100 % for too long.
• Check if the motor is overheating.
• Check if the motor is mechanically
overloaded.
• Check that the motor parameter "1-24
Motor Current" is set correctly.
• Check that the motor data in parameters
1-20 through 1-25 are set correctly.
• Check the setting in parameter "1-91,
Motor External Fan".
• Run AMA in parameter 1-29.
W/A
Alarm
code
Description Cause Remedy Type
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