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8. Fault finding
Fault (LED status)
1.
LED "PWR" is on
and LED "HDD1" is
off.
2.
The LED of the
power supply unit
remains off when the
power has been
switched on.
3.
The status LEDs
show that the CIU
850 has never
connected to GRM.
See sections
6.1 Communication
and
status LEDs
6.2 Ethernet status
LEDs.
4.
The status LEDs
show that the CIU
850 is not connected
to Modbus RTU.
See section
6.1 Communication
status
LEDs.
5.
The status LEDs
show that the CIU
850 is not connected
to Modbus TCP. See
section
6.1 Communication
status
LEDs.
6
Possible cause
a)
The microSD card is not
inserted correctly in slot 1.
b)
There is no microSD card in
slot 1, or the card is
defective.
a)
The power supply unit is
defective.
b)
No power supply present.
a)
No GRM commissioning has
taken place.
b)
The CIU 850 cannot connect
to the Internet.
c)
The Ethernet cable is
defective or not connected
correctly.
a)
The serial cable or 9-pin to
15-pin serial adapter is
defective or not connected
correctly.
b)
The wires of the 9-pin to 15-
pin serial adapter are
defective.
c)
Wrong configuration of the
GRM account.
a)
The Ethernet cable to the
Modbus TCP slaves is not
proper connected.
b)
The Ethernet cable to the 3G/
4G router is not proper
connected.
Remedy
Turn off the CIU 850, press on the microSD
card and remove it from the slot. Re-insert
the card in slot 1 and click it home. Turn on
the CIU 850.
Check if the microSD card has been inserted
in slot 2 by mistake.
For card replacement, find the product
number in the parts list and contact the
nearest Grundfos service centre.
Connect another 24 V power supply unit to
the PLC CPU.
Contact the nearest supplier service centre.
Check the main power supply and the fuse.
Configure the GRM server according to
section
5.4 GRM
commissioning.
Check that ports 80 and 443 of the Ethernet
router, firewall and network are open for
outbound traffic.
Check that both ends of the Ethernet cable
are correctly inserted in the ports, and that
LED5 is on. Replace the cable if necessary.
Check that both ends of the serial cable are
correctly inserted in the ports or adapter. If a
radio modem is used, check the external 24 V
power supply of the radio modem.
Replace the cable or adapter if necessary.
Replace the adapter.
Check that the configuration of GRM is
correct.
Check the Ethernet cable connection to the
Modbus TCP slaves.
Check the Ethernet cable connecting to the
router and that the router is switched on and
correctly set. Verify that the SIM card fit to the
router and uses the correct closed APN.
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