Fault Finding - Grundfos CIM 2 series Montage- Und Betriebsanleitung

5. Fault finding

Faults in a CIM 2XX Modbus module can be detected by observing the status of the two communication LEDs.
See the table below.
CIM 2XX fitted in a Grundfos product
Fault (LED status)
1. Both LEDs (LED1 and LED2)
remain off when the power
supply is connected.
2. The LED for internal
communication (LED2)
is flashing red.
3. The LED for internal
communication (LED2)
is permanently red.
4. The Modbus LED (LED1)
is permanently red.
5. The Modbus LED (LED1)
is flashing red.
10
Possible cause
a) The CIM 2XX is fitted
incorrectly in the Grundfos
product.
b) The CIM 2XX is defective.
a) No internal communication
between the CIM 2XX and the
Grundfos product.
a) The CIM 2XX does not support
the Grundfos product
connected.
a) Fault in the CIM 2XX Modbus
configuration.
a) Fault in the Modbus
communication (fault in parity
or cyclic redundancy check).
Remedy
Check that the CIM 2XX is fitted /
connected correctly.
Replace the CIM 2XX.
Check that the CIM 2XX is fitted
correctly in the Grundfos product.
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, e.g.
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 3.5.
• Check the parity setting (switch
SW3). See section 3.4.
• Check the cable connection
between the CIM 2XX and the
Modbus network.
• Check the termination resistor
settings (switches SW1 and
SW2).
See section 3.3.