Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 97)

Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014 97
Programming and Parameters Chapter 4
Dynamic Control File
Fil
e
Gr
oup
No. Parameter Name & Description Values
DYNAMIC
C
ONTRO
L
Control Modes
040 [Nom Input Volt]
Sets the incoming supply voltage level. It is used to calculate the DC voltage level for charging control. Default:
Min/Max:
Units:
Based on Unit Rating
Based on Unit Rating
1V AC
041 [PWM Frequency]
Sets the carrier frequency for the PWM output. This frequency is fixed to 3.6 kHz, and cannot be
changed due to the LCL filter. Default:
Min/Max:
Units:
3.6 kHz
3.0/16.0 kHz
0.1 kHz
042 [Modulation Type]
Selects the modulation type.
0 (HW Modulator) = ASIC modulator with the classical third harmonic injection. The current distortion
is lower and spectrum is slightly better compared to the Software Modulator.
1 (Software 1) = Symmetric vector modulator with symmetrical zero vectors. Current distortion is less
than with software modulator 2 if boosting is used.
2 (Software 2) = Symmetric BusClamp, in which one switch always conducts 60 degrees either to
negative or positive DC-rail. Switching losses are reduced compared to the modulation type 0 and 1,
and spectrum is narrow.
3 (Software 3) = Unsymmetrical BusClamp, in which one switch always conducts 120 degrees to
negative DC-rail to reduce switching losses. Drawback is that upper and lower switches are unevenly
loaded and spectrum is wide.
We recommend using the Software 2 setting. For AFE parallel operation, the Software 3 setting in all
AFEs must be used. Default:
Options:
2
0
1
2
3
Software 2
HW Modulator
Software 1
Software 2
Software 3
043 [Modulation Index]
Sets the modulation index limit. The default setting of modulation index is 100%. To get the
maximum 1 minute overload current (ND/HD), the modulation index needs to be adjusted from 100%
to 120%. However, this effects the modulated output voltage and current waveform (THD) during
overload operation. Default:
Min/Max:
Units:
100%
20/200%
1%
045 [RatedLineCurrent]
Sets the rated current of the supply transformer. This parameter may need to be set if the AFE is
oversized compared to the supply or feeding transformer capacity. Default:
Min/Max:
Units:
Unit Current
0.0/6553.5 Amps
1.0 Amps
046 [Start/Stop Mode]
Selects the operating mode for the AFE.
0 (Normal) = The AFE starts only with the Run request by a RUN or START command.
1 (Auto) = The AFE starts regenerative operation automatically whenever the DC bus voltage is higher
than the DC voltage reference, and stops when there is no regeneration. To avoid starting, a digital
input can be configured to ‘Enable’, and turning off the digital input stops the automatic starting. Default:
Options:
0
0
1
Normal
Normal
Auto
047 [Restart Delay]
Sets the minimum time between a previous stop command and the next start request to start the
AFE. This parameter takes effect only if parameter 46 [Start/Stop Mode] is set to ‘0’ (Normal). Default:
Min/Max:
Units:
220 ms
0/32000 ms
1 ms
048 [Stop Delay]
Sets the off time delay between the removal of a Run request and stopping the modulation. This
parameter takes effect only if parameter 046 [Start/Stop Mode] is set to ‘1’ (Auto). The converter stops
modulating after [Stop Delay] when the converter changes from regenerative to motoring mode and
the DC bus voltage is at least 3% below the DC voltage reference. Default:
Min/Max:
Units:
100 ms
0/32000 ms
1 ms
049 [Auto Stop Level]
Sets the active current level for the Auto operation mode when parameter 046 [Start/Stop Mode] is
set to ‘1’ (Auto). When the active current value is higher than this value, the regeneration stops. Default:
Min/Max:
Units:
-3.0%
-100.0/100.0%
1.0%
050 [Contact On Delay]
Sets the Main contactor on delay time (the delay from Main contactor acknowledge to modulation
start). Default:
Min/Max:
Units:
0.40 secs
0.00/10.00 secs
0.01 secs