TECO E510s Series - Page 301

4-235
Fig. 4.3.108 Diagram for download detection of water pressure
 When downward detection of water pressure starts, the output frequency will decelerate with
the deceleration time of water pressure detection (23-27). Water pressure reduces with the
deceleration when water consumption continues and pressure feedback value rises if the value
is lower than that of target pressure value (23-02) - range of water pressure detection (23-24).
It may cause shortly fluttering or instability during water detection process. User can
appropriately adjust the range of water pressure detection (23-24) to avoid the occurrence of
severe flutter. Mild water consumption result in pressure reducing during deceleration and the
inverter’s output frequency may decrease to sleep frequency. But if pressure feedback value is
lower than that of target pressure value (23-02) - range of water pressure detection (23-24), the
output frequency will accelerate again.
Table 4.3.18 Guide for comparison of water pressure detection direction
Pros Cons
Upward
detection
of water
pressure
 Keep the pressure above the target pressure during
this process.
 For strict and precise applications
 If “Pump lift” is too high, operation frequency is
higher without water consumption or with mild
water consumption. So this detection effect is too
restricted to jump into sleep.
 Energy-saving of water flow is not obvious and
Slave is not easy to sleep under the multiple pumps
in parallel.
Downward
detection
of water
pressure
 Jump into sleep status without water consumption
or with mild water consumption.
 For energy-saving purpose, under the multiple
pumps in parallel regulate the pumps to the
optimum operation state during this process.
 Startup sequency is by Master, Slave 1, Slave 2, and
Slave 3. Sleep sequency is by Slave 1, Slave 2, and
Slave 3 and Master. After the switching time is
allowable, alternate Master and Slave reach the
average of life expectancy.
 Pressure fluctuations may occur during this process
if user inappropriately regulates the range of water
pressure detection (23-24) and the deceleration
time of water pressure detection (23-27).