OPERATION
Control Options
68
Pump Application Features
Sleep Mode with Pressure Boost
The Sleep feature monitors pressure and frequency to detect a no-demand condition, at which point it stops
the motor. The Sleep Feature also has the option to boost system pressure by a set amount before stopping.
The Sleep feature works only in Auto mode using PID. PID2 operation does not have Sleep function.
The following parameters control Sleep functions:
Sleep Mode [SET–26]:
This setting enables or disables sleep mode and the sleep plus boost option. The
default value for submersibles and surface/boost applications is
Sleep Only
. If a pressure boost is desired
while the system is at rest, select
Sleep + Boost
and set a
Sleep Boost Value [SET–29]
.
Sleep Check Time [SET–27]:
Time delay (sleep check cycle time) before each Sleep Check procedure.
Default = 10 sec.
Sleep Delay [SET–28]:
Delay before VFD triggers Sleep Mode when all other conditions are met. Default = 6
sec.
Sleep Boost Value [SET–29]:
Value added to original setpoint to provide pressure boost—0.0 to 10.0% of
Feedback Max Value [SET–20]. Default = 3%.
Sleep-Boost Timer [SET–30]:
Timer that limits sleep boost duration if Sleep Boost setpoint is not reached—
5 to 120 seconds. Default = 10 sec.
Wakeup Level [SET–31]:
Sets a wakeup level for VFD to quit Sleep mode and start running—0.0 to [SET-21].
Default = 55 PSI.
Sleep Bump Timer [SET–32]:
Sets a duration time for pressure bump to increase system pressure as part of
the no-demand calculation. Default = 5 sec.
No Flow Mode [IO–38]:
If a flow switch is installed on one of the Digital Inputs (MI1–8) and [IO-38] is set to
Sleep, the flow switch becomes an additional condition for sleep mode. If Sleep Delay timer has started and
at any time before the timer expires the flow switch opens, the VFD will immediately go to either sleep
mode (no Sleep Boost) or to Sleep Boost mode (with S-boost enabled).
All default settings related to Sleep mode have been calculated for best system performance for most appli
-
cations. However, some well conditions may require a slight adjustment.
During system setup it is recommended to test the Sleep feature by closing a main valve to simulate a no-
demand condition. The system should be running at normal demand, maintaining pressure setpoint, then
flow should be decreased slowly until stopped.
•
If the system does not enter Sleep mode, it may be necessary to increase the
PID Lo Hz Limit [SET–22]
to
ensure that system pressure reaches
PID Setpoint [SET–21]
(plus boost, if enabled).
•
If, during normal operation, the system enters Sleep mode, but cycles on and off rapidly as it nears the
Setpoint, it may be necessary to slightly lower the
PID Lo Hz Limit [SET–22]
to prevent Sleep mode prob
-
lems.
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:
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