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6 TROUBLESHOOTING AND MAINTENANCE
6.1 FAULT AND ALARMS
NOTE!
Refer to the quick reference and to the programming manual of the MW500 for
further information about each fault or alarm.
6.2 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS
Problem
Point to be Verified
Motor will not
Incorrect wiring
start
Analog reference
(if used)
Wrong settings
Fault
Motor stall
Motor speed
Loose connections
oscillates
Defective speed reference
potentiometer
Oscillation of the external
analog reference
Too high or too
Incorrect settings
low motor speed
(reference limits)
Control signal of the
analog reference
(if used)
Motor nameplate
Display off
HMIR connections
Power supply voltage
Main supply fuse open
6.3 DATA TO CONTACT THE TECHNICAL ASSISTANCE
For information or service request, it is important to have at hand the following data:
Inverter model.
„
Serial number and manufacturing date of the product found in the identification label (refer
„
to
Section 2.4 IDENTIFICATION LABELS on page
Software version installed (see P0023 and P0024).
„
Information about the application and programming executed.
„
Table 6.1: Solutions for the most frequent problems
1. Check all the power and command connections
1. Check if the external signal is properly connected
2. Check the status of the control potentiometer (if used)
1. Check if the parameter values are correct for the application
1. Check if the inverter is disabled due to a fault condition
1. Decrease the motor overload
2. Increase P0136, P0137 (V/f)
1. Stop the inverter, turn off the power supply and tighten all the
connections
2. Check all the internal connections of the inverter
1. Replace the potentiometer
1. Identify the cause of the oscillation. If the cause is electrical noise, use
shielded cables or separate them from the power or command wiring
2. Interconnect the GND of the analog reference to the grounding
connection of the inverter
1. Check whether the content of P0133 (Minimum Speed) and P0134
(Maximum Speed) are properly set for the used motor and application
1. Check the level of the reference control signal
2. Check the setting (gain and offset) of parameters P0232 to P0240
1. Check whether the motor used matches the application
1. Check the connections of the inverter external HMIR
1. Rated values must be within the limits specified below:
200-240 V power supply: - Min: 170 V - Max: 264 V
380-480 V power supply: - Min: 323 V - Max: 528 V
1. Replace the fuses
Troubleshooting and Maintenance
Corrective Action
9).
MW500 | 37
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