Rain bird AUTO-EC-3-E-PLC User Manual
AUTO-EC-3-E-PLC
Electric Filter Backwash Controller
Operation & Maintenance Manual
Contents
Controller Basics 3
Controller Components 4
Screen Flow Diagram 5
Controller Functions 6
Installation 7
Warranty 8
AUTO-EC-3-E-PLC Controller Manual
Contents
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AUTO-EC-3-E-PLC Controller Manual
EC-3-LP-PLC
Controller Basics
Controller Basics
Auto-EC-3-E-PLC Backwash Controllers are designed to monitor and activate a cleaning cycle
for three Low Pressure Series lters in parallel.
The controller allows the user to adjust the ush
duration, dwell time between backwashes,
and the specied periodic backwash. Other
features include manual start, counter reset,
and alarmreset.
The controller receives an open/closed signal
via terminals 1 through 6. This signal is from the
dierential pressure gauge, and means that the
gauge has reached a preset value. Reaching the
preset value (usually 7 psid) tells the controller
that debris has collected on the screen element,
and that an automatic backwash will activate.
D502
SCR501D501
A2
L1
M
O
V
5
10
F2
F1
MOV503
SW501
L2
115 230
S2
C504
18090
INHIBIT
SW502
S3
D502
SCR501D501
A2
L1
M
O
V
5
0
1
F2
F1
MOV503
SW501
L2
115 230
S2
C504
18090
INHIBIT
SW502
S3
D502
SCR501D501
A2
L1
M
O
V
5
10
F2
F1
MOV503
SW501
L2
115 230
S2
C504
18090
INHIBIT
SW502
S3
13 14
13 14
13 14
13 14
13 14
9
5
1
11 12 13
13 14
9
9
9
5
5
5
1
1
1
9
9
5
5
1
1
5 7
4
321 14 1516171819 20 21 22 23 24 25
109
6
8
D503
SCR502
02
V5
O
M
03
02
1
5
0
C
R5
R5
C501
02
C
I5
A1
SO502
+
C502
IC501
METER
CL
IL501
S1
TORQUEDECELACCEL
MIN SPDMAX SPD
IR COMP
D503
SCR502
02
V5
O
M
03
02
1
5
0
C
R5
R5
C501
02
C
I5
A1
SO502
+
C502
IC501
METER
CL
IL501
S1
TORQUEDECELACCEL
MIN SPDMAX SPD
IR COMP
D503
SCR502
02
V5
O
M
03
02
1
5
0
C
R5
R5
C501
02
C
I5
A1
SO502
+
C502
IC501
METER
CL
IL501
S1
TORQUEDECELACCEL
MIN SPDMAX SPD
IR COMP
26
When a closed signal is sensed on terminals
1 and 2 for a 5 second period, the backwash
sequence begins. The backwash sequence
is: station 1 energizes for the ush duration,
then an idle period for the dwell duration,
then station 2 energizes for the ush duration,
another dwell, and then station 3 energizes for
the ushduration.
Controls
A. Panel enclosure: NEMA 4X
B. Control panel for each lter module shall
include:
1. All required control and power elements
to provide automatic self- cleaning system
operations.
2. Main power disconnect switch
3. Starters
4. Transformer
5. PLC
6. Relays
7. Timers
8. Alarm logic modules
9. TIME & DP, and DP ONLY modes of operation with two position selector switch.
10. Indicating lights
C. Depending on mode of operation, control
Auto-EC-3-E-PLC
panel will be responsible for opening the electric exhaust ball valve and starting the motor to
rotate the cleaning element. After the cleaning
interval is complete, control panel shall stop the
motor, close the exhaust valve, and reset the
cleaning cycle for the next operation.
D. With the selector switch in the TIME&DP
position, timers shall intermittently initiate the
cleaning cycle at preset adjustable intervals
ranging from 0 to 24 hours for the length of
time necessary to complete one cleaning cycle.
E. A dierential pressure switch shall be
arranged on the lter or across the inlet and
outlet piping of the lter to override the timer
in the TIME&DP mode or acting alone in the
DP ONLY mode to initiate the cleaning cycle
whenever a dierential pressure across the lter
exceeds a preset value. The dierential pressure
switch shall continue to operate the cleaning
cycle until the dierential pressure across the
lter returns to normal or an adjustable timer
inside the control panel elapses. If the cleaning
cycle continues until this preset timer elapses,
then the control panel shall shut down the
cleaning operation completely causing the red
alarm FAULT light to glow on the cover of the
control panel and send a 24 volt AC alarm signal
to terminals 17 and 18 inside the control panel.
F. A “TEST” button shall be located on the control panel door that will initiate a cleaning cycle
upon demand.
G. A “RESET” button shall be located on the
control panel door.
H. Control panel and all components of each
control panel shall be Underwriter’s Laboratory
listed.
I. Additional features
1. Flush in progress - relay contact closure
output
2. System fault alarm - relay contact closure
output
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