ABB C1900 Series User Guide

7
5 OPERATION
5.1 Operating Sequence – Fig. 5.1
Fig. 5.1 Operating Sequence
1
4
3
3
Line
Neutral
Milk Pump
TB1
E
L1
N/L2
3
4
5
6
7
N/L2
N/L2
RL2a
RL2b
From
Divert
Relay
RL1.1
RL1a
RL1b
2
7
1
8
TB5
6
5
3
4
7
2
8
1
TB2
Event
marker
4
3
5
6
RL1
RL2
Customer's Wiring
Instrument Wiring
Relay RL3 is de-energised
All other relays shown energised
(forward flow)
C
L1
C
N/O
Logic
Input
TB6
L
N
TB3
Divert
Forward
RL3
TB4
C
L2
Leak
Divert
Power
to
C1900
(On)
(On)
(Off)
FS1
Fuse
4A
1
4
3
5
6
8
2
7
FDA Dairy Relay Board
Ground
Main Stud
6
3
2
4
7
Leak
Detector
Flow
Diversion
Valve
(On)
Divert
Relay
2
1
2
3
4
5
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.
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.
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).
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.
TB3 can be used for remote indication of this
event.

ABB C1900 Series Specifications

General

Brand	ABB
Model	C1900 Series
Category	Measuring Instruments
Language	English