E-House Design; Cables Between Afe And Lcl Filters; Cables To The Damping Resistors; Test With The Real System Transformer And Motors - Danfoss VLT Active Front End AFE 302 Operating Instructions Manual

Crane System Design
6.
3 3
•
Switch Crane off.
•
Program the PLC to the normal start-up
sequence.
•
Switch Crane on.
•
The AFE starts, but not any of the inverters, and
verify that the AFE and inverter LCP readings are
975 V DC and that they are within ±2% of a
calibrated voltage meter.
•
Check if all fans are running after closing the
mains contactor.
•
Start checking inverters and motors.
•
Save all parameter settings with MCT 10 Set-up
Software.
•
For the crane commissioning, measure THDu and
THDi of the 630 V and 400 V terminals and
document the results in the commissioning
certificate.
•
Verify that the THD levels of the 400 V terminal
are complied to EN 61000-3 or other country
specified harmonic requirements.

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 50 cm
from other power cables.

3.4.2 Cables to the Damping Resistors

The cables should be as short as possible.
18
Operating Instructions
Use parameter group 7-** Controllers as
follows:
•
Parameter 7-61 DC-Link
Reference is 975 V.
•
Parameter 7-62 DC-Link PI
Proportional Gain (Kp) is
calculated internally based on
the power size and DC
capacitance in parameter 7-60
DC-Link Total Capacity.
Recommend to use the default
value. The wrong setting could
cause the unstable DC voltage
regulation.
•
Parameter 7-63 DC-Link PI
Integral Time (Ti) is 5 ms in
default.
Danfoss A/S © Rev. 05/2014 All rights reserved.
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

Chapter 3.7.1 Emergency Run when One Slave Unit is
Damaged to chapter 3.7.4 Restoration after Master Unit is
Repaired describe how to set up an emergency run and
how to restore the drive for the case where one of the
three units are damaged. Chapter 3.7.5 Emergency Run
When More Than One Unit is Damaged describes the case
where the multiple units are damaged.
3.7.1 Emergency Run when One Slave Unit
is Damaged
NOTICE
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.
NOTICE
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 at
the terminals before and after the DC fuses.
MG33X402