CDE360 Vector Control AC Drive Chapter 6 Parameters Description
Multi-pump control mode 2:
Pump adding logic
The same with mode 1.
Pump removing logic
The same with mode 1.
Auto change logic
Suppose current auxiliary pump startup sequence is 2->3->4.
speed-regulated motor and motor 2# are running,and the conditions is suitable for
auto change..
Muli-pump control logic will switch auxiliary pump to the system by the sequence:
3->4->2.
First AC drive cuts off the connection of Motor 2#.
Then AC drive swith Motor 3# to the system directly.
And so on.
Multi-pump control mode 3:
Pump adding logic
First all pumps are in stop mode.
When received running command,AC drive start Motor 1# after the time set by
E6.18.
AC drive will stop by coasting mode and disconnect motor 1# if whole system can
not meet the demand.Then motor 2# will be started by AC drive.After the time set
by E6.18,motor 1# will be connected to power grid.
If the whole system still can not meet the demand,AC drive will stop by coasting
mode and disconnect motor 2# .Then motor 3# will be started by AC drive.After
the time set by E6.18,motor 2# will be connected to power grid.
And so on.
Pump removing logic
Current speed-regulated motor is motor 3#.
Suppose two auxiliary motors are running,and the system supply is more than
actual demand.
If AC drive output decreases to lower than “Reduce pump frequency 2 - 1”,and
lasts for “Dec pump delay time”,Motor 1# will be disconnected from power
grid.Then AC drive will increase output frequency by a step of (Add pump
frequency 2 - Reduce pump frequency 2).
Moter 2# removing logic is similar with motor 1#.
