Pratica Chef Express Service Manual page 80

IMPINGEMENT SYSTEM
74
The following table shows the main failures and alarms that may occur in the inverter.
Failure / Alarm
A046 - High load in the
blower motor shaft.
A050 - Power Module
Over Temperature
F021 - Under voltage in
CC bus
(please read the
following row)
F022 - Overvoltage in
CC bus
F051 -
Overtemperature in
IGBT's
F070 - Overcurrent /
Short-circuit
F072 - Overload in the
blower motor
Description
Blower motor overload alarm.
The power module temperature
sensor has detected high
temperature.
Under voltage failure in
intermediate circuit.
Overvoltage failure in
intermediate circuit.
Power module sensor over-
temp.
Overcurrent or output short-
circuit for blower motor or CC
bus.
Overload failure in the blower
motor (60s in 1.5 x l nom).
Probable cause
Defective blower motor.
Temperature in lGBT's high (P030 >
230F / 110C).
Room ambient temperature too
high (> 122F / 50C) or elevated
output current.
Cooling fans may be blocked or not
operating.
Wrong input supply voltage, set
inverter data in labels are per the
supply source network and the P296
parameter.
Input voltage too low.
Missing input phase.
Failure in preload circuit.
Wrong supply voltage.
Supply voltage is very high.
Load inertia very high or very fast
deceleration ramp.
Very high P151 adjustment.
Temperature in lGBT's high (P030 >
230F / 110C).
Room ambient temperature too
high (> 122F / 50C) or elevated
output current.
Cooling fans may be blocked or not
operating.
Short-circuit between two phases of
the blower motor.
lGBT's module in shorting or
damaged.
Load on the blower motor shaft very
high.