Vacon 20 User Manual

Fault tracing vacon • 23
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
7
7.3 Other fault conditions
The following fault tracing diagram will help you to locate and fix some of the most usual problems.
If the problem persists contact your local distributor.
Figure 3. Fault tracing diagram for Modbus RTU
.
Check cabling
Check grounding
9330A.emf
No communication
Counter OK
Poor communication
Check communi- cation status (par.
Counter does not run
Counter for bad frames
increases
Check fieldbus parameters
bus parameters in menu
Check other field-
Check selected
protocol
Check termination resistors
Check that both ends of the fieldbus line hav termi- nation resistors (chapter 4) Check parameters
e
Is the device in READY state?
Check Master’s parameters
Is fieldbus selected as control place?
Does Master give RUN command?
Check cabling
Check termination resistors
Other bus devices
Check connections
Check the led on keypad
Check external interlockings (I/O)
Check configura- tions (Sla e add- ress, baudrate etc.)
v
Check distances between cables, see chapter 4.
Check cable types, see chapter 3.
Check grounding, see chapter 4. Re- member to make grounding for each device!
Check terminals for loose connections
Check stripping of cables and conductors, see chapter 4.
Use keypad to monitor variable
Check that both ends of th fieldbus line have t rmina- tion resistors (chapter 4)
e
e
Check cable for cuts Check correct place- ment of conductors in terminals
Check other necessary devices
Drive does not start from the bus
Check control place parameter setting
V2.1)

Vacon 20 Specifications

General

Communication Options	Modbus, CANopen, PROFIBUS, Ethernet
Protection Class	IP20
Power Range	0.25 to 18.5 kW
Control Method	Scalar control, Vector control
Ambient Temperature	-10°C to +50°C