LVD-EOTKN047U-EN REV A
Effective: 2020-10-05
2
Resume at power-up
o
The drive remembers the reference point it was last running at in AUTO mode when the run
command is removed or power is lost. Upon a new run command the drive will ramp to the last
reference point.
o
If the drive were cycled from AUTO, to HAND, and then back to AUTO mode, then the drive will
ramp to the last frequency it was running at in AUTO mode.
o
The benefit of this configuration is the drive remembers the last reference point, which is helpful
for installations that experience frequent power outages.
Init to actual
o
The drive does not remember the last reference point after a power cycle, and will start at a
reference of 0 after a power cycle.
o
If the drive was cycled from AUTO, to HAND, and then back to AUTO mode, then the drive will
maintain the HAND reference as the new AUTO reference point.
o
If the run command is removed from either AUTO or HAND mode, upon a new run command in
AUTO mode the last reference is used.
o
The benefit of this configuration is for installations that require frequent manual adjustments with
HAND mode, as the transition from HAND to AUTO is seamless.
Step 3: Select the location to land the reference increase and decrease contacts on the drive:
Primary Settings > Start, stop, reference > Primary auto control location > Floating point control > Up from:
Primary Settings > Start, stop, reference > Primary auto control location > Floating point control > Down from:
Pro tip: Using the ACH580 as an example, use of DI5 and DI6 is typical, as those digital inputs are unassigned based
on factory default settings. If different digital inputs are chosen, then verify they do not have any other conflicting
functions assigned to them.
Step 4: Adjust
Minimum
and
Maximum
frequency settings as needed for the application:
Primary Settings > Start, stop, reference > Primary auto control location > Floating point control > Minimum
Primary Settings > Start, stop, reference > Primary auto control location > Floating point control > Maximum
Step 5: Adjust the
Ramp time
setting as needed for the application.
Primary Settings > Start, stop, reference > Primary auto control location > Floating point control > Ramp time
Pro tip: The
Ramp time
is based on both the
Minimum
to
Maximum
frequency settings adjusted in Step 4. HVAC
applications rarely require reverse, so most technicians will set the
Minimum
value to 0 or a positive number.
The 580 series drive can integrate easily with a pressure control switch that may be existing on a piece of equipment. The above steps
outline the procedure to configure the drive for this application. In lieu of using Primary settings, the drive parameters 22.71 through
22.80 can also be used to configure floating point control. Adding a drive to fixed speed equipment, thus allowing the equipment to
become variable speed, will result in significant energy savings.