Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 122)

Symptom Possible cause Test Solution
Motor running in wrong direction
Motor rotation limit Check that 4–10 Motor Speed
Direction is programmed correctly.
Program correct settings
Active reverse signal Check if a reversing command is
programmed for the terminal in
parameter group 5–1* Digital
inputs.
Deactivate reversing signal
Wrong motor phase connection
Motor is not reaching maximum
speed
Frequency limits set wrong Check output limits in 4–13 Motor
Speed High Limit [RPM], 4–14
Motor Speed High Limit [Hz] and
4–19 Max Output Frequency.
Program correct limits
Reference input signal not scaled
correctly
Check references input signal
scaling in 6–0* Analog I/O Mode
and parameter group 3–1*
References. Reference limits in
parameter group 3–0* Reference
Limit.
Program correct settings
Motor speed unstable Possible incorrect parameter
settings
Check the settings of all motor
parameters, including all motor
compensation settings. For closed
loop operation, check PID settings.
Check settings in parameter group
1–6* Analog I/O mode. For closed
loop operation, check settings in
parameter group 20–0* Feedback.
Motor runs rough Possible over-magnetization Check for incorrect motor settings
in all parameters
Check motor settings in parameter
groups 1–2* Motor Data, 1–3* Adv
Motor Data, and 1–5* Load Indep.
Setting.
Motor will not brake Possible incorrect settings in the
brake parameters. Possible too
short ramp down times
Check brake parameters. Check
ramp time settings
Check parameter group 2–0* DC
Brake and 3–0* Reference Limits.
Open power fuses or circuit
breaker trip
Phase to phase short Motor or panel has a short phase
to phase. Check motor and panel
phase for shorts
Eliminate any shorts detected
Motor overload Motor is overloaded for the
application
Perform startup test and verify
motor current is within
specifications. If motor current is
exceeding nameplate full load
current, motor may run only with
reduced load. Review the
specifications for the application.
Loose connections perform pre-startup check for
loose connections
Tighten loose connections
Input current imbalance greater
than 3%
Problem with mains power (see
Alarm 4 input phase loss
description in the Warnings and
Alarms table)
Rotate input power leads into the
frequency converter one position A
to B, B to C to A.
If imbalanced leg follows the wire,
it is a power problem. Check
mains power supply.
Problem with the frequency
converter
Rotate input power leads into the
frequency converter one position:
A to B, B to C, C to A
If imbalance leg stays on same
input terminal, it is a problem with
the unit. Contact the supplier.
Motor current imbalance greater
than 3%
Problem with motor or motor
wiring
Rotate output motor leads one
position: U to V, V to W, W to U.
If imbalanced leg follows the wire,
the problem is in the motor or
motor wiring. Check motor and
motor wiring.
Problem with the frequency
converters
Rotate output motor leads one
position: U to V, V to W, W to U.
If imbalance leg stays on same
output terminal, it is a problem
with the unit. Contact the supplier.
Troubleshooting
120 Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL