GE VAT2000 User Manual

6. Control Functions and Parameter Settings
6-50
1) Multipump control operation
An example of actual operation for the multipump control is shown below.
ON
ON
ON
T3
ON(1)
(2)
(3)
(4)
time
(5)
T1
T1
T1
ULT
LLT
PID Output
Sequence Output
PSO1
(pump1)
PSO2
(pump2)
PSO3
(pump3)
PSO4
(pump4)
PSO5
(pump5)
T2
ULT: PID output upper limit value in VAT2000
LLT: PID output lower limit value in VAT2000
T1: Holding time
T2: Continuous operation time limit
T3: Changeover time
The ON/OFF control of multiple pumps is carried out so that the operation time of each
pump is equal.
(1) When the PID output reaches ULT for a time T1, the pump 2 with the shortest
operation time turns ON (through PSO2 output).
(2) When the PID output reaches LLT for a time T1, the pump 1 (PSO1), with the longest
operation time turns OFF.
(3) Following (2), when the PID output still hold at LLT for a time T1, the pump 3 (PSO3)
with the longest operation time turns OFF.
(4) ON/OFF pumps changeover is ignored If the PID reaches LLT or ULT for a shorter
time than T1
(5) If the time that the pump’s ON/OFF control is carried out reaches T2, the pump 4
(PS04) with the longest operation time will turn OFF, and the pump 5 (PSO5) with the
shortest operation time will turn ON after T3.

GE VAT2000 Specifications

General

Brand	GE
Model	VAT2000
Category	Controller
Language	English