Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 113)

Warning/Alarm Description Cause Remedy
2 — Sensor Fault This warning or alarm will only
appear if programmed by the user
in 6–01 Sensor FaultTimeout
Function. The signal on one of the
analog inputs is less than 50% of
the minimum value that is
programmed for that input.
Broken wiring or faulty device
sending the signal.
Check the connections on all the
analog input terminals. Control
card terminals 53 and 54 for
signals, terminal 55 common.
General Purpose I/O Option Card
terminals 11 and 12 for signals,
terminal 10 common. Analog I/O
Option Card terminals 1, 3, 5 for
signals, terminals 2, 4, 6 common.
Check that the frequency converter
programming and switch settings
match the analog signal type.
Perform Input Terminal Signal Test
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 Input Imbalance.
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
Warnings and alarms
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 111