Amtech Axpert-Eazy Series - Page 152

Amtech
6-106
6
MODE – H: SPECIAL APPLICATION FUNCTION PARAMETERS
GROUP-1: MULTI-PUMP FUNCTION PARAMETERS
Multi-pump control refers to a function which controls the flow passage pressure at a constant level by
running pumps in parallel using one Axpert-Eazy AC Drive and it’s internal relay output /
programmable sequence outputs.
The pressure step of the ON/OFF controlled pumps is interpolated by a pump that is variable-speed
controlled by the AC Drive, which has the PID control function. This maintains the pressure's
continuation.
The relay outputs can be used for the pump’s ON/OFF control are the programmable relay1,
programmable relay2 and programmable sequence output. Assign the pump number to the respective
relay / PSO in parameters C107~C112.
The system configuration is shown below.
Limiter
Monitor
FSI
Pump-1
M
M
M
M
M
P
P
P
P
P
Pump-2
Pump-3
Pump-4
PID
Pump ON/OFF
command
PSO-1
PSO-2
PSO-3
PSO-4
U,V,W
Converter
PID Ref
Input
(C603)
Pressure Sensor
PID
Feedback
Input (C604)
AXPERT EAZY AC DRIVE
Pressure Feedback
Multi-pump control operation
An example of actual operation for the multi-pump control is shown below.
PID Output
Time
ULT
T1
LLT
T2 T2
T3
T4
Pump-1
ON
ON
OFF
OFF
Pump-2
ON
OFF
Pump-3
(1)
(2)
(3)
(4)
ON
OFF
Pump-4
(5)
Sequence Output
ON
ON/OFF control pump changeover operation (when operating five pumps)