Grundfos CIU 501 Instructions

English (GB)
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14.3 Fault finding CIM/CIU 500
Faults in the CIU 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.
14.3.1 LED status
CIU 500 connected to an E-pump
CIM 500 fitted in the CIU 500
Fault (LED status) Possible cause Remedy
1. Both LEDs (LED1 and LED2) remain off
when the power supply is connected.
a) The CIM 500 is fitted incorrectly in the
Grundfos product.
Check that the CIM 500 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 Modbus 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 49.
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.
Fault (LED status) Possible cause Remedy
1. Both LEDs (LED1 and LED2) remain off
when the power supply is connected.
a) The CIU 500 is defective. Replace the CIU 500.
2. The LED for internal communication
(LED2) is flashing red.
a) No internal communication between the
CIU 500 and the Grundfos product.
• Check the cable connection between the
Grundfos product and the CIU 500.
• Check that the individual conductors
have been fitted correctly. e.g. not
reversed.
• Check the power supply to 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 49.
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.

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English