Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual

Page: 75 / 252

OPERATION
Control Options
75
Dual Demand Control with Pipe Leak Protection
The Dual Demand control mode was designed for pump systems with distinct high and low demand
requirements and to provide Pipe Leak protection. If the pump is sized to supply water to a high demand
system such as a pivot but at some point will supply a low demand line (sprinklers or a hose), the system
can be quickly over-pressurized, and the pump will cycle because it is too big for this low demand system.
With Dual Demand control, the VFD will determine which demand level to activate at wakeup. If the VFD is
in sleep mode and the pivot system (high demand) valve is opened, the VFD will wake up in a short period
of time. If the sprinkler system (low demand) valve is opened, it will take longer to wake up the VFD. If
wakeup time exceeds the wake up time setting for the current demand mode, the VFD activates pipe leak
alarm or protection.
Set the following parameters to activate this feature:
Dual Demand [ADV2–45]:
1_Enabled
or
0_Disabled
. If
enabled, remaining parameters should be set during
system start-up.
Pipe Leak Sel [ADV2–46]: 0_Disabled or:
• 1_Alarm: An alarm message will be activated.
• 2_Trip: The VFD will trip on Pipe Leak fault.
NOTE: Pipe leak detection works with or without Dual
Demand mode.
Last Wake Time [ADV2–47]: This is a read-only value
that shows how much time it took for the last VFD
wake up. Wake up monitoring starts when the VFD is in
sleep mode and pressure drops below Setpoint and
continues until pressure is below Wake-Up Level. Once
Last Wake Time [ADV2-47] has been determined, the fol -
lowing time parameters can be adjusted.
H-H Wake Time [ADV2–48]: This is an adjustable setting for High to High Demand wake up time, which
should be determined during system setup, after Last Wake-up Time is calculated. Recommended setting is
10-20% greater than
[ADV2–47] value. Default = 4 seconds.
H-L Wake Time [ADV2–49]: This is an adjustable setting for High to Low Demand wake up time, which
should be determined during system startup. Recommended setting is 20-30% greater than [ADV2–47] value
for proper Pipe Leak protection operation. Default = 10 seconds.
L-L Wake Time [ADV2–50]: This is an adjustable setting for Low to Low Demand wake up time, which
should be determined during system startup. Recommended setting is 20-30% greater than
[ADV2–47]
value
for proper Pipe Leak protection operation. Default = 14 seconds.
L-H Wake Time [ADV2–51]: This is an adjustable setting for Low to High Demand wake up time, which
should be determined during system setup, after Last Wake-up Time is calculated. Recommended setting is
10-20% greater than
[ADV2–47]
value. Default = 6 seconds.
LD Setpoint [ADV2–52]: This sets the Low Demand pressure setpoint. Adjusted to lower or higher than HD
(Main) pressure setpoint value to provide desired pressure and prevent overpressure trip at pump start in
Low Demand situation. Default = 70.0 PSI.
LD Max Freq [ADV2–53]: This is a PID High Frequency Limit setting for Low Demand. Set to a low frequency
to prevent overpressure trips during run but high enough to maintain pressure at LD Setpoint [ADV2-52] . Default
= 48.0 Hz.
LD Timer [ADV2–54]: This is an adjustable setting for Low Demand mode time. When VFD determines Low
Demand mode during wake-up but at any point pressure cannot reach
[ADV2–52]
setpoint within the timer,
VFD will switch control to High Demand mode. Default = 10 seconds.
NOTE: If VFD trips on a fault or power is cycled during Low Demand mode, it will start in Low Demand mode
after reset or power-up.
Run
Run
No
Demand
No Demand
Low Demand
High
Demand
H-L Wake T
[ADV2-49]
Wakeup Time
L-L Wake T
[ADV2-50]
Pipe Leak
[ADV2-46]
Status
Pressure
Set-Point (HD) [SET-21]
LD S-point [ADV2-52]
Wake-up Level [SET-31]
Frequency
PID Hi Limit [SET-23]
LD Max Freq. [ADV2-53]
PID Lo Limit [SET-22]
PID Control
Sleep
Sleep
PID Control