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16. Fault finding
16.1 CIM 200
Faults in a CIM/ 200 can be detected by observing the status of
the two communication LEDs. See the table below and section
.
16.1.1 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 200 is defective.
Replace the CIM 200.
2. The LED for internal communication
(LED2) is flashing red.
a) No internal communication between the
CIM 200 and the Grundfos product.
Ensure that the CIM 200 is fitted correctly in
the Grundfos CU36X.
3. The LED for internal communication
(LED2) is constantly red.
a) The CIM 200 does not support the
Grundfos product connected.
Contact the nearest Grundfos company.
4. The Modbus LED (LED1) is constantly
red.
a) Fault in the CIM 200 Modbus
configuration.
• Check the transmission speed (switches
SW4 and SW5). If the switches are set to
"software-defined", an invalid value may
have been set via Modbus. Try one of the
preselected transmission speeds, e.g.
19200 bits/s.
• Check that the Modbus address
(switches SW6 and SW7) has a valid
value [1-247].
5. The Modbus LED (LED1) is flashing red. a) Fault in the Modbus communication
(fault in parity or cyclic redundancy
check).
• Check the transmission speed (switches
SW4 and SW5).
See section
• Check the parity setting (switch SW3).
.
• Check the cable connection between the
CIM 200 and the Modbus network.
• Check the termination resistor settings
(switches SW1 and SW2).
See section
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