Warning/Alarm Description Cause Remedy
4 — Input phase loss A phase is missing on the supply
side, or the mains voltage
imbalance is too high. This
message also appears for a fault in
the input rectifier on the frequency
converter. Options are
programmed at [14–12] Function
at Mains Imbalance (not
applicable for single-phase
drives).
Check the supply voltage and
supply currents to the frequency
converter.
5 — DC link voltage high The intermediate circuit voltage
(DC) is higher than the high
voltage warning limit.
The limit is dependent on the
frequency converter voltage
rating. The frequency converter is
still active.
6 — DC link voltage low The intermediate circuit voltage
(DC) is lower than the low voltage
warning limit.
The limit is dependent on the
frequency converter voltage
rating. The frequency converter is
still active.
7 — DC overvoltage If the intermediate circuit voltage
exceeds the limit, the frequency
converter trips after a time.
Connect a brake resistor
Extend a ramp time
Change the ramp type
Activate functions in [2–10] Brake
Function
Increase [14–26] Trip Delay at
Inverter Fault
8 — DC under voltage If the intermediate circuit voltage
(DC) drops below the under
voltage limit, the frequency
converter checks if a 24 VDC
backup supply is connected.
If no 24 VDC backup supply is
connected, the frequency
converter trips after a fixed time
delay. The time delay varies with
unit size.
Check that the supply voltage
matches the frequency converter
voltage.
Perform input voltage test
Perform soft charge and rectifier
circuit test.
9 — Inverter overloaded The frequency converter 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 frequency
converter cannot be reset until the
counter is below 90%.
The fault is that the frequency
converter is overloaded by more
than 100% for too long.
Compare the output current
shown on the LCP with the
frequency converter rated current.
Compare the output current
shown on the LCP with the
measured motor current.
Display the Thermal Drive Load on
the LCP and
10 — Motor overload temperature According to the electronic
thermal protection (ETR), the
motor is too hot. Select whether
the frequency converter gives a
warning or an alarm when the
counter reaches 100% in [1–90]
Motor Thermal Protection.
The fault occurs when the motor is
overloaded by more than 100% for
too long.
Check for motor overheating.
Check if the motor is mechanically
overloaded.
Check that the motor current set in
[1–24] Motor Current is correct.
7 Warnings and alarms
Aquavar
®
Intelligent Pump Controller - 150 HP to 600 HP INSTRUCTION MANUAL 139
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