Vacon NX ACTIVE FRONT END II Applications Manual page 57

Arfiff05 Standard AFE-II
P2.6.4 Start Delay
This parameter defines a starting delay when run command is given. When programming
different delay to paralleled units, the units will start in sequence. This is needed in
parallel units so that synchronization does not happen simultaneously with all drives.
Simultaneous starting may lead to failed synchronization. Recommended to set value so
that AFE units following start attempts do not happen at the same time with the other
units.
P2.6.5 Modulator type
This Parameter is for changing the modulator type. With ASIC (HW) modulator the
current distortion is lower, but losses are higher compared to software modulator. It is
recommended to use Software modulator.
0 = Hardware modulator: ASIC modulator, which is classical third harmonic injection.
Spectrum is slightly better compared to Software 1 modulator.
1 = Software modulator 1: Symmetric vector modulator with symmetrical zero vectors.
Current distortion is less than with software modulator 2 if boosting is used.
2 = Software modulator 2: Symmetric BusClamb, in which one switch always conducts
60 degrees either to negative or positive DC-rail. Switching losses are reduced without
different heating of upper and lower switches. Spectrum is narrow. Not recommended
for parallel units.
3 = Software modulator 3: Unsymmetric BusClamb, 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. Not recommended
for parallel units.
4 = Software modulator 4:
injection. Dedicated to be used in back to back test benches etc. to avoid circulating third
harmonic current. Drawback is that required DC voltage is 15% higher compared to other
modulator types.
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
Run
AFE 4
Stop
Run
AFE 3
Stop
Run
AFE 2
Stop
Run
AFE 1
Stop
Pure sine wave, sinusoidal modulator without harmonic
ID1500
Time * 100 ms
ID1516
vacon • 57