6
If in circulation mode, the EPLC-6 control unit first calculates the difference between two
sets of data collected from the 4-20 mA pressure transmitters (transmitter1-transmitter2,
where transmitter1 is the value gathered from the transmitter at the entrance of the fixture
and transmitter2 is from the transmitter at the exit of the fixture) and then compares
this to the set differential pressure value at which the device is desired to work. When
the system is run, if the difference between the values acquired from the transmitters is
larger than the set value, the system keeps running with a single pump. If there is a driver
in the system, it operates at minimum frequency. If the difference in pressure between
transmitters is smaller than the set value, and if there is a driver in the system, the pump
with the driver accelerates and attempts to match the reference differential pressure. If
necessary, that is to say, if a single pump cannot meet the demand, the other pumps are
activated in order and deactivated if the need is met. If the difference between the two
transmitter values goes above the set value again (if the demand is met), a single pump is
kept in operation. If there is a driver, it operates at minimum frequency.
PARAMETER
BOOSTER
CIRCULATION
MINIMUM PRESSURE PROTECTION TIME
30 seconds
N/A
MAXIMUM PRESSURE PROTECTION TIME
10 seconds
10 seconds
SWITCH OFF TIME
30 seconds
30 seconds
SWITCH ON TIME
30 seconds
30 seconds
PERIODIC WORK
12 hours
12 hours
PUMP COUNT
3 pumps
3 pumps
WAKE UP PRESSURE
0,5 bar
0,2 bar
MAX. PRESSURE
12 bar
12 bar
DRIVER SWITCH OFF FREQ.
44 Hz
30 HZ
WAKEUP TIME
5 seconds
0
SLEEPING TIME
30 seconds
0
NUMBER OF REPEAT
5
5
MINIMUM PROTECTION PRESSURE
2 bar
0.1 bar
SENSOR SELECTION
SENSOR 1
SEN1-SEN2
SPARE PUMP
0
0
SPARE PUMP ON/OFF
0
0
DRIVER SELECTION
1
1
SET PRESSURE
8 bar
1 bar
SENSOR TYPE
16 bar
10 bar
Table 1. Panel Factory Settings
