9.13 MULTIPUMP FUNCTION
The Multi-pump function lets you control a maximum of 6 motors, pumps or fans with the
PID controller.
The AC drive is connected to a motor, which is the regulating motor. The regulating motor
connects and disconnects the other motors to/from the mains with relays. This is done to
keep the right setpoint. The Autochange function controls the sequence in which the motors
start to make sure that they wear equally. You can include the regulating motor in the
autochange and interlock logic, or set it to always be Motor 1. It is possible to remove motors
momentarily with the Interlock function, for example for maintenance.
ON
OFF
ON
OFF
Delay
Bandwidth
Feedback
Setpoint
Drive is running at maximum
or close to maximum frequency
M1
M2
Fig. 79: The Multipump function
If the PID controller cannot keep the feedback in the set bandwidth, a motor or motors are
connected or disconnected.
When to connect and/or add motors:
•
The feedback value is not in the bandwidth area.
•
The regulating motor operates at a close to maximum frequency (-2 Hz).
•
The conditions above are true for longer than the bandwidth delay.
•
There are more motors available
When to disconnect and/or remove motors:
•
The feedback value is not in the bandwidth area.
•
The regulating motor operates at a close to minimum frequency (+2 Hz).
•
The conditions above are true for longer than the bandwidth delay.
•
There are more motors that operate than the regulating one.
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