Grundfos CIU 501 User Manual

14. Fault finding the product
14.1 CIM 200
You can detect faults in CIM 200 by observing the status of the two communication LEDs.
Related information
3.2 CIM 200 Modbus RTU
14.1.1 LED status
CIM 200 fitted in a Grundfos E-pump
Fault (LED status) Possible cause Remedy
Both LED1 and LED2 remain off when
the power supply is connected.
CIM 200 is fitted incorrectly in the Grundfos E-
pump.
Ensure that CIM 200 is fitted and connected correctly.
CIM 200 is defective. Replace CIM 200.
LED2 for internal communication is
flashing red.
No internal communication between CIM 200
and the Grundfos E-pump.
Ensure that CIM 200 is fitted correctly in the Grundfos E-pump.
LED2 for internal communication is
permanently red.
CIM 200 does not support the Grundfos E-pump
connected.
Contact the nearest Grundfos company.
The Modbus LED1 is permanently
red.
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, for example 19200 bit/s.
• Check that the Modbus address, switches SW6 and SW7, has a
valid value [1-247].
The Modbus LED1 is flashing red.
Fault in the Modbus communication (fault in
parity or cyclic redundancy check).
• Check the transmission speed, switches SW4 and SW5.
• Check the parity setting, switch SW3.
• Check the cable connection between CIM 200 and the Modbus
network.
• Check the termination resistor settings, switches SW1 and SW2.
CIM 200 fitted in CIU 200
Fault (LED status)
Possible cause Remedy
Both LED1 and LED2 remain off when
the power supply is connected.
CIU 200 is defective. Replace CIU 200.
The LED2 for internal communication
is flashing red.
No internal communication between CIU 200
and the E-pump
• Check the cable connection between the E-pump and CIU 200.
• Check that the individual conductors have been fitted correctly.
• Check the power supply to the E-pump.
The LED2 for internal communication
is permanently red.
CIU 200 does not support the E pump which is
connected.
Contact the nearest Grundfos company.
The Modbus LED1 is permanently
red.
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, for example 19200 bit/s.
• Check that the Modbus address, switches SW6 and SW7 has a
valid value [1-247].
The Modbus LED1 is flashing red.
Fault in the Modbus communication (fault in
parity or cyclic redundancy check).
• Check the transmission speed, switches SW4 and SW5.
• Check the parity setting, switch SW3.
• Check the cable connection between CIM 200 and the Modbus
network.
• Check the termination resistor settings, switches SW1 and SW2.
Related information
5.1 Setting the Modbus transmission speed
5.2 Setting the stop bits and the parity bit
5.4 Termination resistor
42
English (GB)

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English