Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 80)

NOTE: This function is not intended for substitution of proper pipe layout and sizing
according to Hydraulic Institute Standards.
Pump protection setup
Sleep mode
Sleep Mode protects the pump by turning off the pump in cases where there is no flow in
the system. Sleep mode can be enabled or disabled. If Sleep Mode is disabled the pump
will not turn off during a no flow condition if no other control devices are present to turn
the pump off. The Sleep Frequency/Low Limit [4-12] and Sleep Delay [22-24] are set first.
The Sleep Frequency/Low Limit [4-12] is the frequency that the pump has to reach or fall
below in order to enter sleep mode. The Sleep Frequency is also the minimum frequency.
The Sleep Delay is the amount of time the pump speed must be at or below the Sleep
Frequency in order to enter Sleep Mode. Use this parameter to prevent the pump from
entering sleep mode too soon.
The Restart Difference [22-44] is the difference between the setpoint and the actual value
that will cause the pump to restart (wake up) from sleep mode. This value is entered as a
percent of the setpoint. For example, if the setpoint is 50 psi and a 10% Restart Difference
is entered the pump will restart from sleep mode after the system pressure drops 5 psi
below the set pressure (45 psi). If multiple setpoints are used then a Restart Difference
must be entered for each setpoint.
The Minimum Run Time [22-40] and Minimum Sleep Time [22-41] can be used to prevent
rapid cycling. The Minimum Run Time [22-40] forces the pump to stay on and not enter
sleep mode until the pump runs for the time entered in Minimum Run Time [22-40]. The
Minimum Sleep Time [22-41] forces the pump to stay in sleep mode (turned off) for the
time entered in Minimum Sleep Time [22-41].
Operation
78 Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL