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16.3 CIM 500
Faults in the CIM 500 can be detected by observing the status of
the two communication LEDs. See the table below and section
4.4 CIM 500 Modbus TCP.
16.3.1 LED status
Fault (LED status) Possible cause Remedy
1. Both LEDs (LED1 and LED2) remain off
when the power supply is connected.
a) The CIM 250 is fitted incorrectly in the
CU 36X.
Ensure that the CIM 250 is fitted/connected
correctly.
b) The CIM 500 is defective. Replace the CIM 500.
2. The LED for internal communication
(LED2) is flashing red.
a) No internal communication between the
CIM 500 and the Grundfos product.
Check that the CIM 500 is fitted correctly in
the Grundfos product.
3. The LED for internal communication
(LED2) is permanently red.
a) The CIM 500 does not support the
Grundfos product connected.
Contact the nearest Grundfos company.
4. The Ethernet LED (LED1) is
permanently red.
a) Fault in the CIM 500 Modbus TCP
configuration.
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" on page
91.
5. LED1 is permanently red and green at
the same time.
a) Error in firmware download. Use the Web server to download the
firmware again.
6. LED2 is permanently red and green at
the same time.
a) Memory fault.
Replace the CIM 500.
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