Rockwell Automation Liqui-Flo AC GP Vector Drive Version 6.4 - Manual (Page 145)

Programming Reference 4-63
H.017 Input Power/Snubber Configuration (continued)
Set H.017 = 0 for LiquiFlo applications.
For AC input Power Modules (200-230 V, 3-phase, 50/60 Hz or 380-460 V, 3-phase,
50/60 Hz), set H.017 = 0 or 1.
For DC input Power Modules, set H.017 = 2 or 3 if multiple motors are connected to
the inverter. Set H.017 = 4 or 5 if a single motor is connected to the inverter.
Snubber Resistor
If a snubber resistor is not used, set H.017 = 0, 2, or 4. If the DC bus voltage rises
above a certain threshold (14% above the rectified nominal AC line), the drive will
increase the commanded frequency in an effort to reduce bus voltage. The drive will
increase the commanded frequency a maximum of 10 Hz but will not exceed the value
specified in P.004 (Maximum Speed). The deceleration time (P.002) may be
automatically extended to prevent a high bus voltage fault from occurring. If the bus
voltage continues to rise, a high bus voltage fault (HU) will be generated.
If a snubber resistor is used, set H.017 = 1, 3, or 5. If the DC bus voltage rises above
a certain threshold (14% above the rectified nominal AC line), the drive will not
attempt to increase the commanded frequency, but will rely on the hardware snubber
resistor to decrease voltage. Note that you may need to extend the deceleration time
specified in P.002 (Decel Time) to prevent a high bus voltage fault (HU) from
occurring.
Line Dip Ride-Through
Line dip ride-through allows the drive to remain active during low line voltage or line
voltage loss for the time period specified in P.042 (Line Dip Ride-Through Time).
To enable line dip ride-through, set H.017 = 0, 1, 4, or 5. If the DC bus drops below the
low DC bus voltage threshold, or the AC line voltage drops out, the drive will reduce
the commanded frequency and regenerate to hold up the bus. Note that the drive will
decelerate at a rate required to hold up the bus, and may not use the value specified
in P.002 (Decel Time 1).
To disable line dip ride-through, set H.017 = 2 or 3. If the bus voltage drops below the
low DC bus voltage threshold or the AC line drops out, a low bus voltage fault (LU) will
be generated, and the drive will stop.
Refer to P.042 for more information regarding line dip ride-through.
!
ATTENTION: When connected to a non-regenerative common DC bus,
regeneration may cause a rise in DC bus voltage. Be aware that other
drives on the bus may experience an unexpected speed increase due to
the high bus voltage. Failure to observe this precaution may result in
bodily injury.