Bell & Gossett P2001489 Integrated Technologic with Sensorless Control - Manual (Page 45)

Warning/Alarm Description Cause Remedy
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
10 — Motor overload
temperature
According to the electronic
thermal protection (ETR),
the motor is too hot. Select
whether the frequency
converter gives a warning
or an alarm when the
counter reaches 100% in 1–
90 Motor Thermal
Protection.
The fault occurs when the
motor is overloaded by
more than 100% for too
long.
Check for motor
overheating.
Check if the motor is
mechanically overloaded.
Check that the motor
current set in 1–24 Motor
Current is correct.
11 — Motor thermistor over
temp
The thermistor might be
disconnected. Select
whether the frequency
converter gives a warning
or an alarm in 1–90 Motor
Thermal Protection.
Check for motor
overheating.
Check if the motor is
mechanically overloaded.
When using terminal 53 or
54, check that the
thermistor is connected
correctly between either
terminal 53 or 54 (analog
voltage input) and terminal
50 (+10 V supply) and that
the terminal switch for 53
or 54 is set for voltage.
Check 1–93 Thermistor
Source selects terminal 53
or 54.
When using digital inputs
18 or 19, check that the
thermistor is connected
correctly between either
terminal 18 or 19 (digital
input PNP only) and
terminal 50. Check 1–93
Thermistor Source selects
terminal 18 or 19.
Troubleshooting
Integrated Technologic ® with Sensorless Control INSTRUCTION MANUAL 43