Restoration After Master Unit Is Repaired; Emergency Run When More Than One Unit Is Damaged; Manual Shut Down Sequence - Danfoss VLT Active Front End AFE 302 Operating Instructions Manual

Crane System Design
3.7.4 Restoration after Master Unit is
Repaired
1. Switch Crane on but do not run any frequency
converter/motor.
3 3
2. Turn the key switch to AFE normal mode.
3. A warning 78 appears on AFE.
4. Check on the AFE LCP if it is in set-up 1 (see
attached file LCP.pdf). The set-up shift at the AFE
is done with terminal 32 at AFE control card.
Terminal 32 = 0 means set-up 1, Terminal 32 = 1
means set-up 2.
5. Switch Crane off.
6. Check the DC-link voltage with a voltage meter at
the terminals before and after the DC fuses.
NOTICE
Do not touch until the DC voltage is below 10 V.
7. Bring back the ribbon cables on the MDCIC card
in the original set-up (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.
3.7.5 Emergency Run When More Than
One Unit is Damaged
When multiple units are damaged, an emergency run with
a minimum of one unit can be performed. The procedure
of setting up the emergency run and restoring from the
emergency run can be referred to in
chapter 3.7.1 Emergency Run when One Slave Unit is
Damaged to chapter 3.7.4 Restoration after Master Unit is
Repaired.
The key procedure of an emergency run is as follows:
1. Disconnect AC and DC sides of the damaged
units.
2. Change the connector position at MDCIC.
2a
2b
20
Operating Instructions
The ribbon cables at the MDCIC are
connected from FK100 (Master)
following FK101, FK102, and FK103. You
do not skip the terminal sequence.
You can go down to one unit. When
one master unit is used, the part
Danfoss A/S © Rev. 05/2014 All rights reserved.
(176F9091) needs to be connected at
FK101 to have the RS-485 communi-
cation.
3. Power up.
3a The warning message W78 (Power Unit
Setup) appears on LCP.
3b Change the number of the units in
parameter 14-59 Actual Number of
Inverter Units.
4. Power cycle.
4a The warning message W77 (Reduced
Power Mode) appears on LCP.
4b The power is reduced to the original
power multiplied by the number of
active units over the original number of
the units.
The following issues are considered:
1. In an emergency run, the door fan may not be in
operation. It is recommended that the emergency
configuration is only for a temporary usage.
2. An emergency run may cause the overcurrent
alarm at start-up because the start-up current
may be high for the number of units used. The
switching frequency (parameter 14-01 Switching
Frequency) may need to be increased from 1.5
kHz to 2 or 2.5 kHz.

3.8 Manual Shut Down Sequence

•
Stop all motor drives.
•
switch off the AFE start signal.
•
Open the mains contactor
•
Switch off the HT transformer if necessary
•
In emergency, command the AFE to stop and
open the AFE contactor, or pull the safe stop and
open the AFE contactor.
MG33X402