User`s guide

145
CHAPTER 7 - DIAGNOSTICS AND TROUBLESHOOTING
NOTE!
Whencontacting WEG forservices,please havethe following
data on hand:
Invertermodel.
Serial number
,
manufacturing date and
hardware
revision,
as indicated in the inverter nameplate (refer to item 2.4).
Software version (refer to item 2.2).
Information about theapplicationand inverter programming.
7.3
CONTACTING
WEG
7.4
PREVENTIVE
MAINTENANCE
DANGER!
Always disconnect the power supply voltage before touching
anycomponentof the inverter.
Even after switching OFF the inverter, high voltages may be
present. Wait 10 minutes to allow complete discharge of the
power capacitors.
Always connectthe equipmentframe to a suitableground(PE)
point.
ATTENTION!
Electronic boards have components sensitive to electrostatic
discharges.
Never touch the components or connectors directly. If this is
unavoidable, first touch the metallic frame or use a suitable
ground strap.
Never apply a high voltage test on the inverter!
If this is necessary, contact WEG.
To avoid operation problems caused by harsh ambient
conditions, such as high temperature, moisture, dirt, vibration
or premature ageing of the components, periodic inspections
of the inverter and installations are recommended.
PROBLEM
POINT TO BE
CORRECTIVE ACTION
CHECKED
Motor speed too
Programming error
1.Check if the contents of P133 (minimum frequency) and P134
high or too low
(reference limits)
(maximum frequency) are according to the motor
and to the
application.
Signal of the
1.Check the
level of the
control signal of the reference.
Reference Control
2.Check the programming (gains and offset) at P234 to P240.
(if used)
Motor nameplate
1.Check if the used motor meets the application requirements.
data
Display OFF
Keypad connection
1.Check the keypad connections to the inverter.
Power supply
1.The power supply must be within the following ranges:
200-240 V models:
- Min: 170 V
- Max: 264 V
380-480 V models:
- Min: 323 V
- Max: 528 V
Table 7.3 (cont.)
- Solution for the most frequent problems