Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 116)

Warning/Alarm Description Cause Remedy
26 — Brake resistor power limit The power transmitted to the
brake resistor is calculated as a
mean value over the last 120
seconds of run time. The
calculation is based on the
intermediate circuit voltage and
the brake resistance value set in
[2–16] brake Max. Current.
The warning is active when the
dissipated braking is higher than
90% of the brake resistance
power.
If Trip [2] is selected in [2–13]
Brake Power Monitoring, the
frequency converter will trip when
the dissipated braking power
reaches 100%.
27 — Brake chopper fault The brake transistor is monitored
during operation and if a short
circuit occurs, the brake function is
disabled and a warning is issued.
The frequency converter is still
operational but, since the brake
transistor has short-circuited,
substantial power is transmitted to
the brake resistor, even if it is
inactive.
Remove power to the frequency
converter and remove the brake
resistor.
28 — Brake check failed The brake resistor is not connected
or not working.
Check [2–15] Brake Check.
29 — Heatsink temp The maximum temperature of the
heatsink has been exceeded. The
temperature fault will not reset
until the temperature falls below
the reset heatsink temperature.
The trip and reset points are based
on the frequency converter power
size.
Check for the following conditions:
• Ambient temperature too
high.
• Motor cable too long.
• Incorrect airflow clearance
above and below the
frequency converter.
• Blocked airflow around the
frequency converter.
• Damaged heatsink fan.
• Dirty heatsink.
30 — Motor phase U missing Motor phase U between the
frequency converter and the motor
is missing.
Remove power from the frequency
converter and check motor phase
U.
31 — Motor phase V missing Motor phase V between the
frequency converter and the motor
is missing.
Remove power from the frequency
converter and check motor phase
V.
32 — Motor phase W missing Motor phase W between the
frequency converter and the motor
is missing.
Remove power from the frequency
converter and check motor phase
W.
33 — Inrush fault Too many power-ups have
occurred within a short time
period.
Let the unit cool to operating
temperature.
34 — Fieldbus communication
fault
Communication between the
fieldbus and the communication
option card is not operating.
36 — Mains failure This warning/alarm is only active if
the supply voltage to the
frequency converter is lost and 14–
10 Mains Failure is NOT set to [0]
No Function.
Check the fuses to the frequency
converter and mains power supply
to the unit.
Warnings and alarms
114 Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL