Reading out status and error messages: Modbus and LED

The oil level switch state can be read out from the system controller via Modbus. This is a digital input parameter. As an alternative, the signal can also be taken directly from terminals 3 and 4 on terminal strip CN17 which is part of the extension board. (see Schematic wiring diagrams).

Output signal:

• 24 V: The oil level is below the oil level switch
• 0 V: The oil level is too high (above the oil level switch)

Status and error messages of the LED

• LED does not light: Oil level is o. k., it is below the sensor.
• LED lights: Oil level is too high, it is above the sensor.
• LED blinks: Failure within the sensor. Voltage supply is too low or opto-electronic unit installed incorrectly.