Goodrive270 series VFD for fan and pump Basic operation guidelines
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0.00Hz–P00.03 (Max. output frequency)
5.5.16 Water pump control
The VFD provides the multi-pump control function, applicable to the scenario with the simultaneous
operation of up to eight water pumps, capable of balancing fluctuations in water pressure and flow.
This function simplifies the control system and controls the start and stop of each pump motor in
balance mode to ensure optimal performance of the water system. To use this function, configure the
following sub-functions based on requirements:
 Motor adding or reducing
 Multi-pump polling
 Water pump maintenance
 Smooth switchover
Function description
The following describes the function by illustrating a typical case in which one VFD controls four water
pump motors.
The VFD must use the four relay function terminals RO5–RO8 (requiring the use of the optional part
EC-IO503-00), and also use two groups of contactor KM to switch between the two water pump
working states, variable-frequency run mode and power-frequency run mode. All motors are started
and stopped at the ramp speed to achieve soft motor switchover to ensure stable water supply
pressure and reduce the impact on water pipes. You need to refer to Figure 5-28 and Figure 5-29 to
connect the multi-pump variable-frequency control main circuit and external relay control circuit. In
addition, make the following settings:
1. Enable the multi-pump control function (P94.00=1).
2. Set the variable-frequency motor run mode to circular (P94.10=1).
3. Set the motor quantity to 4 (P94.11=4).
4. Set RO5–RO8 to control variable-frequency circulation pumps A, B, C, and D (that is, set
P26.06–P26.09 to 57–60 respectively).
5. Set the contactor closing delay, which is the interval of switchover between the variable-frequency
run mode and power-frequency run mode.
6. Configure the S digital input terminal function and set it to 104–107 to disconnect the cyclic motors
M1–M4.
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