Wiring - Hanna Instruments BL120 Instruction Manual

5.3. WIRING

Ethernet connector
Note: The analog outputs – AO1, AO2, AO3 – are available only for
The Ethernet connector is available only for
Warning! Always disconnect the Pool Controller from power when making electrical connections. Do not access
the larger rear panel. User-serviceable terminals are found in the small sub panel only.
There are four openings for wiring:
• The left rear openings, for power and digital input wiring
• The left front opening, for alarm relay wiring
• The larger right opening, for analog output wiring (BL121& BL123) and the ethernet cable
• Sensor wiring is made using the connector with threaded seal
Note: Do not run power cabling through the same opening as other cables.
All unused openings must be sealed with conduit plugs.
Power cable Alarm relay cable
ANALOG OUTPUTS
(BL121 & BL123)
ETHERNET
(BL122 & BL123)
DIGITAL INPUTS
ALARM RELAY
POWER INPUT
BL121
BL122 & BL123.
Gland seals for Sensor input
inputs cable
Ethernet cable
(BL122
+
A01 4 - 20 mA OUT
–
+
A02 4 - 20 mA OUT
–
+
A03 4 - 20 mA OUT
–
RJ-45 connector
L Line
Protective Earth
N Neutral
& BL123.
(BL122 & BL123)
Analog outputs cable
& BL123) (BL121 & BL123)
13