CDE360 Vector Control AC Drive Chapter 6 Parameters Description
Group E6: Multi-Pump Control
Key points:
Multi-pump control logic can control no more than 4 pumps when working together with
PID regulator.
AC drive can switch a pump to its output or power grid via a relay or Y
terminal(controlling a external relay).
A contact of the manual on/off switch (or protective device, such as a thermal relay, etc.)
of each motor is wired to the interlock circuit. The logic will detect if a motor is
unavailable and start the next available motor instead.
Auto change function is used to make sure each pump takes the average load in the
system.It will adjust the startup sequence to prevent pump rust caused by long time no
used.The motor startup sequence will return to initial status when AC drive stops or
re-power on.
There are two ways for adding a pump.1)Directly connecting the auxiliary pumps to
power grid(mode 1~2).2)The auxiliary pumps are softly started by AC drive first.Then it
will be switch to power grid.AC drive will directly control another new speed-regulated
pump(mode 3~4).
If a motor can be connected to AC drive or power grid,the two switching contactors
must be electric interlocked.
The motor phase sequence must be validated before power on.Make sure the motor
rotation direction under power grid is the same with connecting to AC drive.
AC drive will enter sleep mode when meets the sleep conditions and there is only one
speed-regulated pump running.
Power grid
Motor 1#
Motor 2#
Control cabinet
with AC drive
inside
Pressure sensor
0~10 bar
4~20 mA
Figure 6- 42 Multi-pump control wiring diagram
