Hanna Instruments HI520 - Page 28

Installation & Controller Start-Up 28
Terminal 2
PROBE 2
A
+
B
-
5V
100mA
+
-
PROBE 1
A
+
B
-
5V
100mA
+
-
DIGITAL
INPUTS
IN1
IN2
-
5-30V
IN2
+
+
-
-
5-30V
IN1
+
+
-
COMM
A
B
-
5V
100mA
+
-
+
ANALOG
OUTPUTS
AO 1
AO 2
0 - 20 mA OUT /
4 - 20 mA OUT
0 - 20 mA OUT /
4 - 20 mA OUT
AO 3
0 - 20 mA OUT /
4 - 20 mA OUT
AO 4
+
-
+
-
+
-
+
-
0 - 20 mA OUT /
4 - 20 mA OUT
Terminal 1
RELAY 1
RELAY 2
C
NC
NO
L
POWER
INPUT
PE
N
Line
Protective Earth
Neutral
ALARM
RELAY
NO ALARM
C
NC
NO
ALARM CONDITION OR METER OFF
C
NO
NC
RELAY 3
RELAY 4
RELAY 5
C
NO
Figure 19: Input Values
4.2.4.1. Terminal 1 Wiring
Control Relay Wiring
Up to five control relays are supplied with the controller.
1.
Follow the printed lead markings to ensure that the relay leads on each of the relays are wired to the
correct position on the power supply board.
` NO i.e. Normally Open
` NC i.e. Normally Closed
` C i.e. Common
2. Run the connection cables through conduit openings 3 and 4.
3.
Use a screwdriver to connect the cable leads to the appropriate jack connectors and plug them in the
corresponding sockets.
Note: Wire gauge is load dependent. Do not exceed relay contact’s rating of
5 A / 250 Vac or 5 A / 30 Vdc, resistive load.
Alarm Relay Wiring
The alarm relay provides a contact closure which can be used as a switch to turn an external device on or off.
Note: Alarm contacts are form C rated 5 A / 250 Vac, 2 A / 30 Vdc, resistive load.
Fuse protected: 5 A / 250 V slow blow fuse.