4-237
Fig. 4.3.109 Dual pumps start up process
A. Dual pumps are enabled during this time. Master starts up first and Slave is in standby to enter
constant-pressure operation.
B. Large water consumption results in the higher operation frequency of Master. If water pressure
is not lower than the tolerance range of constant-pressure and the operation time is not over
the detection time (23-30), Slave is still in standby.
C. If it is over the detection time (23-30), and Master runs at 60Hz, Master informs Slave of
auxiliary kicking water. After Slave operates, the operation frequency of Master and Slave
reduces to the operation of constant-pressure if water consumption is stable.
D. If water consumption is mild, the operation frequency of Master and Slave reduces. Because the
water consumption is less than that of the operation of dual pumps, Slave stops to sleep
(please refer to parameter 23-22 for dual pump slave sleep requirements) and only Master runs
to reach constant-pressure operation.
Note 1：
When 23-35=3, If the operation time is over the switching time (23-29) or sleep to stop under the
operation of dual pumps, the dominance between Master and Slave will exchange to operate.
Note 2：
When 23-01≠0, the parameter 23-01 of these two inverters can not be simultaneously set to 1 or 2.
That is, the parameter 23-01 of one inverter is set to 1 and that of the other inverter should be set to
2 and vice versa.
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