Bell & Gossett P2001489 Integrated Technologic with Sensorless Control - Manual (Page 48)

Warning/Alarm Description Cause Remedy
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.
Troubleshooting
46 Integrated Technologic ® with Sensorless Control INSTRUCTION MANUAL