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14. Fault finding
14.1 CIU 202
You can detect faults in a CIU 202 by observing the status of the
two communication LEDs. See the table below and section
4.
Specifications.
14.1.1 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. The LED2 for internal communication is
permanently red.
4. The Modbus LED1 is permanently red.
5. The Modbus LED1 is flashing red.
Possible cause
a) CIM 200 is fitted incorrectly in CIU 202.
b) CIU 202 is defective.
a) No internal communication between
CIM 200 and CIU 202.
a) CIM 200 does not support the in which it
is installed.
a) Fault in the CIM 200 Modbus
configuration.
a) Fault in the Modbus communication
(fault in parity or cyclic redundancy
check).
Remedy
Ensure that CIM 200 is fitted correctly.
Replace CIU 202.
Ensure that CIM 200 is fitted correctly in
CIU 202.
Contact the nearest Grundfos company.
• 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, for
example 19200 bits/s.
• Check that the Modbus address
(switches SW6 and SW7) has a valid
value [1-247].
• Check the transmission speed, switches
SW4 and SW5.
See section
5.1 Setting the Modbus
transmission
speed.
• Check the parity settings, switch SW3.
See section
5.2 Setting the
parity.
• Check the cable connection between CIM
200 and the Modbus network.
• Check the termination resistor settings,
switches SW1 and SW2.
See section
5.4 Termination
resistor.
47
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