English (GB)
7
6. Fault finding
Problem
Possible cause
Remedy
1
Communication has been established. The green
LED goes out after a long time without
communication.
• The PC has suspended PC Tool
Link for power saving.
• The PC is in standby mode.
• Resume normal PC mode.
2
None of the yellow LEDs are on. The product-
specific cable is connected.
• The product-specific cable is
defective.
• PC Tool Link is defective.
• The 5-volt output from the Grundfos
product is missing.
• Check that the product-specific
cable has been connected to the
product and that the product has
been switched on.
• Send PC Tool Link with cables to
Grundfos for service.
3
Communication has not been established. None of
the red LEDs are flashing.
• The PC is not transmitting.
• Check the COM port settings for
PC Tool Link.
4
Communication has not been established. The red
LED (pos. 1) is off, and the red LED (pos. 2) is
flashing.
• PC Tool Link is defective.
• Send PC Tool Link to Grundfos for
service.
5
Communication has not been established. Two red
LEDs (pos. 1 and 2) are off, and two red LEDs (pos.
3 and 4) are flashing.
• The Grundfos product is not
responding.
• Check that the product has been
switched on.
• Check the product-specific cable.
• Check the configuration of the
product-specific PC Tool.
6
Communication has not been established. One red
LED (pos. 1) is flashing, and one red LED (pos. 2) is
off.
• PC Tool Link is defective.
• Send PC Tool Link to Grundfos for
service.
Data
PC Tool Link
Data
RS232
TTL
GENIbus
(RS485)
Power
3 kV Galvanic Isolation
Grundfos Unit
USB
PC
Data
PC Tool Link
Data
RS232
TTL
GENIbus
(RS485)
Power
3 kV Galvanic Isolation
Grundfos Unit
USB
PC
Data
PC Tool Link
Data
RS232
TTL
GENIbus
(RS485)
Power
3 kV Galvanic Isolation
Grundfos Unit
USB
PC
Data
PC Tool Link
Data
RS232
TTL
GENIbus
(RS485)
Power
3 kV Galvanic Isolation
Grundfos Unit
USB
PC
1
2
Data
PC Tool Link
Data
RS232
TTL
GENIbus
(RS485)
Power
3 kV Galvanic Isolation
Grundfos Unit
USB
PC
1
2
3
4
Data
PC Tool Link
Data
RS232
TTL
GENIbus
(RS485)
Power
3 kV Galvanic Isolation
Grundfos Unit
USB
PC
1
2
