3.7.2 Restoration after Slave Unit Repaired
1. Switch Crane on but do not run any frequency
converter/motor.
2.
Turn the key switch to AFE normal mode.
3. A warning 78 (power unit setup) will come up at
the AFE LCP.
4. Check on the AFE LCP if it is in setup 1. 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.
5. Switch Crane off.
6. Check the DC link voltage with a voltage meter
directly on the DC link bus bar and inside the
repaired AFE module (after the DC link fuses inside
the AFE).
NOTE
Do not touch anything until the DC voltage is below 10V
7. Bring back the ribbon cables on the MDCIC card in
the original setup (AFE Master to Inverter 1, AFE
Slave left to Inverter 2, AFE Slave right to Inverter
3).
8. Connect the softcharge connector on the
softcharge board.
9. Connect the DC link fuses and AC connection.
10. Switch on the circuit breaker in front of the AFE.
11. Switch Crane on.
12. The AFE runs now with all 3 power units.
3.7.3
Emergency Run with Master Unit
Damaged
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 Inverter 1
position at the MDCIC.
7. Unplug the ribbon cable at Inverter 3 position on
the MDCIC card and plug it at Inverter 1 position.
8. Plug this ribbon cable (what you plugged out from
Inverter 3) on the connector Inverter 1. Now the
right power unit will be the AFE Master.
9.
Turn the key switch to AFE emergency mode.
10. Switch Crane on.
11. Check on the AFE LCP if it is in setup 2.
12. A warning 78 (power unit setup) may come up at
the AFE LCP.
13. Switch Crane off.
14. Wait at least 20s. All LCPs must be completely off.
15. Switch Crane on.
16. The warning 78 will disappear.
17. Now you can run the crane with only two AFE
power units.
3.7.4
Restoration after Master Unit Repaired
1. Switch Crane on but do not run any frequency
converter/motor.
2.
Turn the key switch to AFE normal mode.
3. A warning 78 (power unit setup) will come up at
the AFE LCP.
4. Check on the AFE LCP if it is in setup 1 (see
attached file LCP.pdf). 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.
5. Switch Crane off.
6. Check the DC link voltage with a voltage meter
directly on the DC link bus bar and inside the
repaired AFE module (after the DC link fuses inside
the AFE).
NOTE
Do not touch anything until the DC voltage is below 10V
7. Bring back the ribbon cables on the MDCIC card in
the original setup (AFE Master to Inverter 1, AFE
Slave left to Inverter 2, AFE Slave right to Inverter
3).
8. Connect the softcharge connector on the
softcharge board.
9. Connect the DC link fuses an AC connection.
10. Switch on the circuit breaker in front of the AFE.
11. Switch Crane on.
12. The AFE runs now with all 3 power units.
Crane System Design
VLT
®
Active Front End AFE 302 Operating Instructions Liebherr
18 MG.33.X2.02 - VLT
®
is a registered Danfoss trademark
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