Grundfos LC 231 - Page 9

2.3.4 Connecting a level sensor
You can either connect an analog level sensor, such
as a pressure sensor, or a digital level sensor, such
as a float switch.
1. Loosen the screws and remove the front cover.
Be careful not to damage the cable between the
front cover and the back cover.
2. Lead the wires through one of the cable glands.
3. Depending on the type of wire, take one of the
following actions:
• For a shielded wire, lead it through the cable
clamp.
CIO1
GND
TM070571
• For a not shielded wire, attach it to the
protection cover with a cable tie.
DIO1
GND DIO2
GND DI1 GND DI2
GND
CIO1
GND
CIO2 GND 24V
GND
24V GND
TM070760
4. Depending on the type and function of the
sensor, connect the wires to the following
terminals. When using an analog sensor, level
switches can be used to add redundance or
security by adding an extra dry-run sensor or
high-level sensor or both.
Sensor
type
Sensor
function
Terminals
Analog All levels
CIO1 - GND - 24
V
Digital
Dry-running
level
CIO2 - GND
Stop level DIO1 - GND
Start level,
pump 1
DIO2 - GND
Not in use DI1 - GND
High level DI2 - GND
Related information
2.2.1 Removing the front cover
3.6 Configuring the IO terminals using Grundfos GO
Remote
2.3.5 Connecting an alarm device
You can connect an alarm device, such as a buzzer
or a lamp, to the output relays Alarm 1 and Alarm 2.
The control unit triggers the alarm device when it
detects an alarm or a warning. You can change the
behaviour of the outputs with Grundfos GO Remote
under Relay output 1 and Relay output 2.
Default settings of the terminal blocks
Terminal block
Default function
Alarm 1 All alarms
Alarm 2 High level
1. Loosen the screws and remove the front cover.
Be careful not to damage the cable between the
front cover and the back cover.
2. Lead the wires through one of the cable glands.
9
English (GB)