Grundfos CIU 501 User Manual

14.3 CIM 500
You can detect faults in CIM 500 by observing the status of the two communication LEDs.
Related information
4.4 CIM 500 Modbus TCP
14.3.1 LED status
CIU 500 connected to an E-pump
Fault (LED status) Possible cause Remedy
Both LED1 and LED2 remain off when the power
supply is connected.
CIM 500 is fitted incorrectly in the Grundfos product. Check that CIM 500 is fitted and connected correctly.
CIM 500 is defective. Replace CIM 500.
LED2 for internal communication is flashing red.
No internal communication between CIM 500 and
the Grundfos product.
Check that CIM 500 is fitted correctly in the
Grundfos product.
LED2 for internal communication is permanently red.
CIM 500 does not support the Grundfos product
connected.
Contact the nearest Grundfos company.
The Modbus LED1 is permanently red. 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.
LED1 is permanently red and green at the same
time.
Error in the firmware download. Use the webserver to download the firmware again.
LED2 is permanently red and green at the same
time.
Memory fault. Replace CIM 500.
CIM 500 fitted in CIU 500
Fault (LED status)
Possible cause Remedy
Both LED1 and LED2 remain off when the power
supply is connected.
CIU 500 is defective. Replace CIU 500.
LED2 for internal communication is flashing red.
No internal communication between CIU 500 and
the Grundfos product.
• Check the cable connection between the
Grundfos product and CIU 500.
• Check that the individual conductors have been
fitted correctly, for example not reversed.
• Check the power supply to the Grundfos product.
LED2 for internal communication is permanently red.
CIM 500 does not support the Grundfos product
connected.
Contact the nearest Grundfos company.
The Ethernet LED1 is permanently red. 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.
LED1 is permanently red and green at the same
time.
Error in the firmware download. Use the webserver to download the firmware again.
LED2 is permanently red and green at the same
time.
Memory fault. Replace CIM 500.
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English (GB)

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English