Danfoss VLT AFE 302 - E-House Design; Cables between AFE and LCL Filters; Cables to the Damping Resistors; Test with the Real System Transformer and Motors

3.4 E-House Design
3.4.1 Cables between AFE and LCL Filters
•
The cables should be as short as possible.
•
The connection must be made with shielded
cables.
The synchronization voltage cable which is connected to the
AFE-MDCIC board MK105 must be separated from all power
cables. The distance needs to be at least 50cm from other
power cables.
3.4.2
Cables to the Damping Resistors
The cables should be as short as possible.
3.5 Test with the Real System Transformer
and Motors
3.5.1 Re-program the Frequency Converter
Parameters
•
Set the mains voltage, mains frequency, the
transformer values, LCL filter values, and DC
capacitance.
3.6
On-site Final Test
3.6.1 Change Parameters to Actual
•
Set actual cable length.
•
Check encoder wiring and encoder direction.
•
Optimize ramp time shapes.
•
Save parameter settings in the LCPs.
3.6.2
Run with Full Load
•
Check that AFE input voltage is stable. The voltage
waveform does not need to be sinusoidal.
•
Check that DC-link voltage is stable.
3.7
AFE Emergency and Restore Procedures
3.7.1 Emergency Run with One Slave Unit
Damaged
NOTE
The mains synchronization voltage is always connected to
the MDCIC board. Make sure that the mains power switch is
off before opening the frequency converter cabinet.
NOTE
The power is reduced to two thirds of the original.
1. Switch Crane off.
2. Switch the circuit breaker in front of the damaged
AFE power unit off.
3. Check the DC link voltage with a voltage meter
directly on the DC link bus bar and inside the
damaged module (after the DC link fuses inside the
AFE).
NOTE
Do not touch anything until the DC voltage is below 10V.
4. Disconnect the DC link fuses of the damaged
power unit and AC connection.
5. Disconnect the softcharge connector on the
softcharge board of the damaged power unit.
6. Disconnect the ribbon cable, from the damaged
AFE power unit, on the MDCIC card.
7. If the removed connector is at Inverter 2 position,
move the ribbon cable at Inverter 3 position to
Inverter 2.
8.
Turn the key switch to AFE emergency mode.
9. Switch Cane on.
10. Check on the AFE LCP if it is in setup 2. The setup
shift at the AFE is done with terminal 32 at AFE
control card. Terminal 32 = 0 means setup 1,
Terminal 32 = 1 means setup 2.
11. A warning 78 (power unit setup) may come up at
the AFE LCP.
12. Switch Crane off.
13. Wait at least 20s. All LCPs must be completely off.
14. Switch Crane on.
15. The warning 78 will disappear.
16. Now you can run the crane with only two AFE
power units.
Crane System Design
VLT
®
Active Front End AFE 302 Operating Instructions Liebherr
MG.33.X2.02 - VLT
®
is a registered Danfoss trademark 17
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