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14.2 CIM/CIU 260
You can detect faults in CIU 260 by observing the status of the
two communication LEDs. See the table below and section
3.3 CIM 260 3G/4G cellular Modbus.
14.2.1 LED status
CIU 260 fitted in a Grundfos booster system
CIM 260 fitted in CIU 260
5. The slave does not change
Modbus transmission speed
with register 00004.
a) Configuration error. Set the transmission speed switches to software-
defined. Otherwise, the value in register 00004 is
ignored by the slave.
b) An invalid value may be set in register 00004. See section 5.1 Setting the Modbus transmission
speed for invalid values, and set correct value in
register 00004.
Fault Possible cause Remedy
Fault (LED status) Possible cause Remedy
1. LED1 and LED2 remain off when the
power supply is connected.
a) CIU 260 is defective. Replace CIU 260.
2. LED2 for internal communication is
flashing red.
a) No internal communication between CIU
260 and the Grundfos product.
• Check the cable connection between the
booster system and CIU 260.
• Check that the individual conductors have
been fitted correctly.
• Check the power supply to the booster
system.
3. LED2 for internal communication is
permanently red.
a) CIU 260 does not support the Grundfos
product connected.
Contact the nearest Grundfos company.
4. LED1 for cellular communication is
flashing yellow. See signal 1 in fig. 22
on page 12.
a) The SIM card has not been inserted. Insert the SIM card.
See section 6.1.2 Inserting the SIM card.
b) The SIM card has not been inserted
correctly.
Insert the SIM card.
See section 6.1.2 Inserting the SIM card.
c) The SIM card PIN code is not correct. Enter the correct PIN code.
See section 6.1.2 Inserting the SIM card.
d) No connection to the cellular network. • Check the connection to the antenna.
• Check the cellular coverage of the area
using for example a mobile phone.
• Use an external antenna and experiment
with the position.
5. The LED1 for cellular communication is
pulsating yellow with single pulse, but
CIM 260 cannot send or receive SMS
messages.
a) CIM 260 has not been initialised. Follow the configuration procedure in "CIM
260 SMS commands", which you can
download from Grundfos Product Center.
Fault (LED status) Possible cause Remedy
1. LED1 and LED2 remain off when the
power supply is connected.
a) CIM 260 is fitted incorrectly in the
Grundfos product.
Ensure that CIM 260 is fitted and connected
correctly.
b) CIM 260 is defective. Replace CIM 260.
2. LED2 for internal communication is
flashing red.
a) No internal communication between
CIM 260 and the Grundfos product.
Ensure that CIM 260 is fitted correctly in the
Grundfos product.
3. The LED2 for internal communication is
permanently red.
a) The 250 does not support the Grundfos
product.
Contact the nearest Grundfos company.
4. LED1 for cellular communication is
flashing yellow. See signal 1 in fig. 22 on
page 12.
a) The SIM card has not been inserted. Insert the SIM card.
See section 6.1.2 Inserting the SIM card.
b) The SIM card has not been inserted
correctly.
Insert the SIM card.
See section 6.1.2 Inserting the SIM card.
c) The SIM card PIN code is not correct. Enter the correct PIN code.
See section 6.1.2 Inserting the SIM card
.
d) No connection to the cellular network. • Check the connection to the antenna.
• Check the cellular coverage of the area
using for example a mobile phone.
• Use an external antenna and experiment
with the position.
5. LED1 for cellular communication is
pulsating yellow with single pulse, but
CIM 260 cannot send or receive SMS
messages.
a) CIM 260 has not been initialised. Follow the configuration procedure in "CIM
260 SMS commands", which you can
download from Grundfos Product Center.
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