Operation; Operating Sequence - ABB C1900 series User Manual

5 OPERATION

5.1 Operating Sequence – Fig. 5.1
Relay RL3 is de-energised
All other relays shown energised
(forward flow)
Customer's Wiring
Instrument Wiring
Ground
Main Stud
Neutral
3
Milk Pump
3
Leak (On) Flow
Detector Diversion
Valve
4
3
7
6
2
Divert
Relay
1
When the hot product reaches the correct
pasteurization temperature, divert relay RL1.1 on
the C1900 main board is energized and power is
applied to RL1 on the dairy relay board.
2
RL1 is energized: contacts are switched from pins
4 to 3 on RL1a and 5 to 6 on RL1b. Power is fed
to the milk pump via TB1 pin 5 and to the flow
diversion valve TB1 pin 6.
3
The milk pump is switched on and the flow
diversion valve is switched into the forward flow
position. The flow diversion valve contacts are
switched from pin 4 to 7 and power is then fed to
RL2 (via TB1 pin 7).
FDA Dairy Relay Board
TB3
Divert
Forward
TB6
Power
L
to
C1900
N
TB1
E
L1
Line
N/L2
N/L2
N/L2
3
4
5
6
7
Fig. 5.1 Operating Sequence
4
(On)
RL2b
1
RL2a
8
FS1
Fuse
4A
2
7
2
(On)
4
RL1a
3
5
RL1b
6
4
RL2 is energized. RL2a volt free contacts switch
from pin 5 to 6 which moves the event marker
pen to the forward flow position (see Fig. 2.2) and
illuminates the forward flow LEDs – see Fig. 2.1.
Relay RL3 (Leak Divert) is de-energized.
5 TB3 can be used for remote indication of this
event.
TB2
Logic
4
Input
3
5
6
TB4
RL2
(Off)
1
8
2
7
1
1
8
TB5
2
7
RL1
C
Event
marker
L1
C
Leak
Divert
L2
4
3
5
6
RL3
C
From
Divert
Relay
RL1.1
N/O
7