Initial Ramp Parameter 229; Fill Mode - Danfoss VLT 8000 AQUA series Operating Instructions Manual

to generate a warning signal via terminal 42 or
45 and via the relay outputs.
In Closed loop, the unit for the feedback is programmed
in parameter 415 Process units.
Description of choice:
Set the required value within the feedback range
(parameter 413 Minimum feedback, FB
414 Maximum feedback, FB
228 Warning: High feedback, FB
(WARN. HIGH FDBK)
Value:
FB
LOW
(parameter 227) - 999,999.999
Function:
If the feedback signal is above the limit, FB
programmed in this parameter, the display will
show a flashing FEEDBACK HIGH.
The warning functions in parameters 221-228 are
not active during ramp-up after a start command,
ramp-down after a stop command or while stopped.
The warning functions are activated when the output
frequency has reached the selected reference.
The signal outputs can be programmed to
generate a warning signal via terminal 42 or
45 and via the relay outputs.
In Closed loop, the unit for the feedback is programmed
in parameter 415 Process units.
Description of choice:
Set the required value within the feedback range
(parameter 413 Minimum feedback, FB
414 Maximum feedback, FB
229 Initial ramp
(INITIAL RAMP)
Value:
OFF/000.1s - 360.0 s
Function:
Allows the motor/equipment to be brought up to
minimum speed (frequency) at a rate different than
the normal Ramp-Up rate (param. 206).
Description of choice:
As an example, vertical pumps and other equipment
often have a requirement to not operate below a
minimum speed any longer than necessary. Damage
and excessive wear can occur when operating below
= factory setting. () = display text [] = value for use in communication via serial communication port
116
, and
MIN
).
MAX
HIGH
999.999,999
,
HIGH
, and
MIN
).
MAX
OFF
®
VLT 8000 AQUA
minimum speed (frequency) for too long a period of
time. The Initial Ramp is used to quickly accelerate the
motor/equipment to minimum speed at which point,
the normal Ramp-Up rate (parameter 206) is made
active. The range of adjustment of the Initial Ramp is
from 000.1 second to 360.0 seconds; adjustable in 0.1
second increments. If this parameter is set to 000.0,
OFF is displayed in this parameter, the Initial Ramp is
not active, and the normal Ramp-Up is active.

Fill Mode

Fill Mode eliminates the occurrence of water hammer
associated with the rapid exhausting of air from
piping systems (such as Irrigation systems).
The frequency converter, set for Closed Loop
operation uses an adjustable Fill Rate, a "Filled
Pressure" setpoint, an operating pressure setpoint,
and a pressure feedback.
Fill Mode is available when:
• The VLT 8000 AQUA drive is in Closed Loop
mode (parameter 100).
• Parameter 230 is not 0
• Parameter 420 is set to NORMAL
After a start command, Fill Mode operation begins
when the frequency converter reaches minimum
frequency - set in parameter 201.
The "Filled" Setpoint - parameter 231 - is actually
a setpoint limit. When minimum speed is reached,
the pressure feedback is looked at, and the
frequency converter begins to ramp to the
"Filled" pressure setpoint at the rate established
by Fill Rate parameter 230.
The Fill Rate - parameter 230 - is dimensioned
in Units/Second. The Units will be the units
selected in parameter 415.
When the pressure feedback equals the "Filled"
Setpoint, the control transitions to the operating
setpoint (Setpoint 1 - param. 418 or Setpoint 2 -
MG.83.A2.02 - VLT is a registered Danfoss trademark