Rockwell Automation Liqui-Flo V2.0 AC Drive - Manual (Page 172)

172 Rockwell Automation Publication D2-3518-3 - May 2013
Chapter 9
Frame 4 drives (firmware version 2.x) only:
Figure 71 - Rectifier Status (101) Frame 4
Selects whether DC bus voltage (Vdc) optimization is enabled or disabled.
At low speeds the inverter requires a lower DC bus voltage, so the voltage
supplied by the rectifier can be lowered to reduce switching losses. The DC bus
voltage must be greater than the peak of the AC line, so this feature is more useful
with 400V AC input.
If Vdc Optimize (102) is set to Disabled, the DC bus voltage generated by the
rectifier
while the rectifier or the entire drive is running is calculated based on a
combination of the value of Vdc Reference (103) and measured line-to-line
voltage of the AC line. In this case, Vdc Reference (103) defines the minimum
DC bus voltage that the rectifier commands while it is running.
If Vdc Optimize (102) is set to Enabled, the DC bus voltage generated by the
rectifier
while the rectifier or the entire drive is running is calculated based on a
combination of the DC bus level necessary to provide the motor voltage required
by the inverter and the measured line-to-line voltage of the AC line. Vdc
Reference (103) is not used in this case.
If Vdc Optimize (102) is set to Enabled, the DC bus voltage required by the
inverter
is calculated from the output frequency of the inverter and the value of
the Max Motor Volts (107), Max Motor Freq (108), and Base Motor Freq (109)
rectifier parameters.
102 Vdc Optimize
Range: 0 = Disabled
1 = Enabled
Default: 0 = Disabled
Access: 0 Dynamic Control > Bus Voltage
See also: 103, 104, 107, 108, 109
x
0 0 1 1 2 3 4 5 6 7 8 9 11 12 13 14 15
x =Reserved
Bit #
OK to Run I
nverter
Rectifier Running Rectifier F
aulted
Rectifier in Limit Rectifier Synch
roniz
ed
Rectifier Phased ACB Rectifier at
V
oltage
Rectifier Regener
ating
Fault Reset Echo
Nibble 1 Nibble 2 Nibble 3 Nibble 4
Rectifier Carrier Sync Loop Control Enable Appl. Digital Out 3 Bit 0 indicates OK to
run
Appl. Digital Out 4 Standb
y