Operation With A Reduced Number Of Power Units - WEG CFW11W G2 Series User Manual

5.7 OPERATION WITH A REDUCED NUMBER OF POWER UNITS

The CFW11W G2 can operate with a reduced number of UP11W G2 and reduced power for a short time. That
operating mode is called "Reduced Power Mode". It may be applied to critical processes in which you do not
want a whole machine to stop when one UP11W G2 fails, enabling the operation with reduced power until you
have a UP11W G2 for replacement.
The general scheme of a drive with 5 UP11W is shown in
works as a drive of up to 2 UP11W.
Assuming that in the drive of
fails. In order to reestablish the drive operation with reduced power (Reduced Power Mode), you must follow the
steps below:
1. Disconnect the power supply from the drive.
2. Identify the defective UP11W G2 (in this case, number 4).
3. Disconnect the power and control of the UP11W G2 number 4, according to
4. Move the control connections on the ICUP board, as shown in
cables of UP11W number 5 to position 4 of the ICUP board. Thus, UP11W G2 5 becomes UP11W G2 4.
5. Configure the new number of UP11 through DIP switch S2 located on the ICUP board, according to
on page 3-12.
6. Change DIP switch S1:4 to ON; thus, it will be informed to the control that the CFW-11W G2 drive is operating
with a reduced number of UP11W G2.
ATTENTION!
It is recommended that the drive operate short of one UP11W G2 at most.
7. Reconnect only the power supply of the drive control.
8. Alarm A420 will be indicated (Reduced Power Mode), informing that the CFW-11W G2 is operating in the
reduced power mode.
9. Check if parameters P0295 (Rat. Curr. ND/HD Inv.) and P0296 (Rated Line Voltage) are according to the voltage
and the number of connected UP11W G2.
10. Set the following control parameters:
11. P0169: Maximum Torque Current +.
12. P0170: Maximum Torque Current -.
13. Parameters P0169 and P0170 must be set so that the maximum torque current will not exceed the maximum
inverter current. The values of those parameters are referenced to the motor rated current, as you can see in
Item 11.8.6 - Torque Current Limit of the CFW11 programming manual.
14. Connect the drive power source.
Figure 3.24 on page 3-20, composed of 5 UP11W G2, the UP11W G2 number4
Energization and Start-Up
Figure 3.24 on page 3-20. The reduced power mode
Figure 5.7 on page
Figure 5.7 on page
5-13.
5-13. Connect the control
Table 3.7
CFW-11W G2 | 5-11
5