Xylem Aquavar, Instruction Manual

Page: 142 / 172

Warning/Alarm Description Cause Remedy
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 54, check
that the thermistor is connected
correctly between terminal 54
(analog voltage input) and
terminal 50 (+10 V supply) and
that the terminal switch for 54 is
set for voltage. Check [1–93]
Thermistor Source selects terminal
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.
12 — Torque limit The torque has exceeded the value
in [4–16] Torque Limit Motor
Mode or the value in [4–17]
Torque Limit Generator Mode.
[14–25] Trip Delay at Torque Limit
can change this from a warning
only condition to a warning
followed by an alarm.
If the motor torque limit is
exceeded during ramp up, extend
the ramp up time.
If the generator torque limit is
exceeded during ramp down,
extend the ramp down time.
If torque limit occurs while
running, possibly increase the
torque limit. Be sure the system
can operate safely at a higher
torque.
Check the application for excessive
current draw on the motor.
13 — Over current The inverter peak current limit
(approximately 200% of the rated
current) is exceeded. The warning
lasts about 1.5 seconds, then the
frequency converter trips and
issues an alarm. This fault may be
caused by shock loading or fast
acceleration with high inertia
loads. If extended mechanical
brake control is selected, trip can
be reset externally.
Remove power and check if the
motor can be turned.
Check that the motor size matches
the frequency converter.
Check parameters [1–20] through
[1–25] for correct motor data.
14 — Ground/Earth fault There is current from the output
phases to ground, either in the
cable between the frequency
converter and the motor or in the
motor itself.
Remove power to the frequency
converter and repair the earth
fault.
Check for ground faults in the
motor by measuring the resistance
to ground of the motor leads and
the motor megohmmeter.
7 Warnings and alarms
140 Aquavar ® Intelligent Pump Controller - 150 HP to 600 HP INSTRUCTION MANUAL