Troubleshooting The Most Common Problems - WEG CFW-11W G2 RB Series User Manual

Fault/Alarm
A401
Current Unbalance
Phase W B4
A402
Current Unbalance
Phase U B5
A403
Current Unbalance
Phase V B5
A404
Current Unbalance
Phase W B5
F408
Fault on the Cooling System
F410
External Fault
(1) For the CFW11M G2 RB or CFW11W G2 RB, the HMI does not indicate in which UP11 G2 (UP11W G2) the fault occurred. LEDs on the ICUP board indicate
which UP11 (UP11W) caused the fault,
Figure 6.1: LEDs that indicate fault on the arms of the power units (desaturation)

6.3 TROUBLESHOOTING THE MOST COMMON PROBLEMS

Problem
DC link will not reach value
programmed in P0151
Display off
Description
Alarm of current unbalance of phase W book 4.
It indicates an unbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current unbalance of phase U book 5.
It indicates an unbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current unbalance of phase V book 5. It
indicates an unbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current unbalance of phase W book 5.
It indicates an unbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
This fault/alarm is linked to the configuration of
parameters P0832 and P0833.
Function of input DIM 1.
„
Function of input DIM 2.
„
Figure 6.1 on page 6-7. When the reset is executed, the LEDs turn off and turn back on if the fault persists.
Table 6.2: Troubleshooting the most common problems
Point to Be Checked
Wrong wiring
Wrong programming
Fault
HMI connections
ICUP supply voltage of 24 Vdc
Troubleshooting and Maintenance
Poor electrical connection between the DC link
„
and the power unit.
Poor electrical connection between input U, V and
„
W of the power unit and the filter.
Note: In case of quick accelerations and brakes,
this alarm may be momentarily indicated,
disappearing after some seconds. This does not
indicate a malfunction of the inverter. In case this
alarm persists when the motor is operating at
constant speed, it is an indication of abnormal
current distribution between the power units.
Fault on pumps (drives with water cooling).
„
Fault on the panel ventilation.
„
Note: Check the drive used in the application.
Input DIM1 or DIM2 open. Check the drive used
„
in the application.
Corrective Action
1. Check all the power and control connections. For example, the
DIx digital inputs programmed as general enable or without
external fault must be connected to the 24 Vdc or DGND* (see
Figure 3.46 on page 3-39 and
1. Check if the parameters have correct values for the application
1. Check if the converter is not disabled due to a fault condition
2. Check if there is a short circuit between terminals XC1:13 and
11 (short circuit in the 24 Vdc power supply)
1. Check the HMI connections outside the inverter
1. Check the connections of the control 24 Vdc power supply
2. Check if the power supply limits are according to
on page 3-42
Possible Causes
Figure 3.47 on page 3-39)
Table 3.28
CFW-11MW G2 RB | 6-7
6