Bell & Gossett P2001489 Integrated Technologic with Sensorless Control - Manual (Page 47)

Warning/Alarm Description Cause Remedy
16 — Short circuit There is a short circuit in the
motor or motor wiring.
Remove power to the
frequency converter and
repair the short circuit.
17 — Control word timeout There is no communication
to the frequency converter.
The warning will only be
active when 8–04 Control
Timeout Function is NOT set
to [0] OFF.
If 8–04 Control Timeout
Function is set to Stop and
Trip, a warning appears and
the frequency converter
ramps down until it stops
then displays an alarm.
Check connections on the
series communication
cable.
Increase 8–03 Control
Timeout Time
Check operation of the
communication equipment
Verify proper installation
based on EMC
requirements.
18 — Start failed The speed has not been
able to exceed 1–77
Compressor Start Max
Speed [RPM] during start
within the allowed time.
(set in 1–79 Compressor
Start Max Time to Trip).
This may be caused by a
blocked motor.
23 — Internal fan fault The fan warning function
checks if the fan is running.
The fan warning can be
disabled on 14–53 Fan
Monitor.
Check for proper fan
operation.
Cycle power to the
frequency converter and
check that the fan operates
briefly at start up.
Check the sensors on the
heatsink and control card.
24 — External fan fault The fan warning function
checks if the fan is running.
The fan warning can be
disabled on 14–53 Fan
Monitor.
Check for proper fan
operation.
Cycle power to the
frequency converter and
check that the fan operates
briefly at start up.
Check the sensors on the
heatsink and control card.
25 — Brake resistor short
circuit
The brake resistor is
monitored during
operation. If a short circuit
occurs, the brake function is
disabled and the warning
appears. The frequency
converter is still operational
but without the brake
function.
Remove power to the
frequency converter and
replace the brake resistor
(see 2–15 Brake Check).
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%.
Troubleshooting
Integrated Technologic ® with Sensorless Control INSTRUCTION MANUAL 45