Ciu - Grundfos CIU 202 Functional Profile And User Manual

14.3 CIU 502

You can detect faults in CIU 502 by observing the status of the
two communication LEDs. See the table below and section
4.4 CIU 502 Modbus TCP.
14.3.1 LED status
Fault (LED status)
1. LED1 and LED2 remain off when the
power supply is connected.
2. LED2 for internal communication is
flashing red.
3. LED2 for internal communication is
permanently red.
4. The ethernet LED1 is permanently red.
5. LED1 is permanently red and green at
the same time.
6. LED2 is permanently red and green at
the same time.
Possible cause
a) CIM 500 is fitted incorrectly in the
Grundfos product.
a) No internal communication between
CIU 502 and the Grundfos product.
a) CIM 500 does not support the Grundfos
product connected.
a) Fault in CIM 500 Modbus TCP
configuration.
a) Error in firmware download.
a) Memory fault.
Remedy
Ensure that CIM 500 is fitted and connected
correctly.
• Check the cable connection between the
Grundfos product and CIU 502.
• Check that the individual conductors have
been fitted correctly, for example not
reversed.
• Check the power supply to the Grundfos
product.
Contact the nearest Grundfos company.
• Check that the rotary switch SW1 is set to
1.
• Check that Modbus TCP IP address
configuration is correct. See section
A.4 Modbus TCP configuration
58.
Use the webserver to download the
firmware again.
Replace CIM 500.
on page
51