Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual, Page: 72 / 252

OPERATION
Control Options
72
Pipe Fill Feature
This feature automates the process of building pressure in an empty pipe system at a reduced speed before
the VFD switches to PID control. This can reduce water hammer in some systems, and can also help prevent
an Underload fault if the drive runs for an extended period at low pressure. The VFD must be running with
PID Control in Auto mode for this feature to be active.
Set the following parameters to activate the Pipe Fill Feature:
Pipe Fill Timer [SET–33]: Pipe Fill mode exit timer to switch to PID control.
• Enter a time between 0.1 and 60 minutes to allow the pipe system to fill.
• If set to 0.0, Pipe Fill is disabled.
• When the timer expires, the VFD cancels Pipe Fill mode and switches to PID control, regardless of
whether
[SET–34] pressure has been reached.
Pipe Fill Exit Level [SET–34]: Pipe Fill mode exit pressure to switch to PID control.
• Enter a pressure setting between 0 and the PID Set-point [SET–21] (default = 25 psi).
• During Pipe Fill mode, if pressure reaches the set value, VFD switches to PID control.
Pipe Fill Freq [SET–35]: Pipe Fill mode High frequency limit setting.
• Range is between
PID Low Freq Limit [SET–22]
and
PID Hi Hz Limit [SET–23]
(default = 47 Hz).
• The Pipe Fill mode frequency should be equal to or greater than [SET–22] +2 Hz to provide enough sys -
tem pressure at the end of pipe fill mode to switch to PID control.
Upon start, if system pressure is less than [SET–34] , VFD will ramp up to Low Freq Limit + 2 and start pipe fill
mode.
•
If system pressure is less than 0.5 x [SET–34] , the frequency reference will increase at a rate of 0.5 Hz per
second.
• If system pressure is equal to or greater than 0.5 x [SET–34] but less than 0.6 x [SET–34] , the frequency
reference will stay at the current value.
• If system pressure is equal to or greater than 0.6 x [SET–34] but less than [SET–34] setting, the frequency
reference will be decreased at a 0.5Hz per second rate. However, the rate will not be decreased below
PID Low Hz Limit
[SET–22] +2 Hz
• If at any point system pressure is equal to or greater than
[SET–34]
, VFD will cancel Pipe Fill mode and
switch to PID control.
Tank Fill, Drain, and Level Control (Analog Trigger)
This feature provides Start/Stop control or Relay output based on tank water levels. It requires a pressure
transducer or tank level transducer installed in the water tank.
The VFD can use several types of measurement for motor control, including flow, level, temperature, etc. For
this application, the transducer output is scaled to measure water level in feet. Trigger by analog level fea
-
ture uses either PID F/B signal or Aux AI signal set in [ADV2-58] through [ADV2-61] .
NOTE: FO mode and Shutdown take priority over Analog Trigger.
Set the following parameters to activate this feature:
Analog Trigger [ADV2-62] :
• Disable: the feature is disabled.
• Relay: (
[IO-47]
,
[IO-48]
, or
[IO-49]
should be set to
17_Analog Trigger
) VFD will activate selected relay in any
VFD state (stop, run, fault, etc.) at the AI Trigger Level [ADV2-65] . It will deactivate it by hysteresis value
depending on the
Trigger Type [ADV2-64]
.
• Run Enable: Enables VFD run command when HOA is in Hand or Auto mode based on Aux AI level
depending on the
Trigger Type [ADV2-64]
. If VFD is set to command via terminals and run signal is present,
VFD will start only when analog signal reaches ON state level based on diagrams on the next page (at