65
Troubleshooting - hardware
If the cause of the error is clearly defective hardware, please send the equipment to your retailer or
manufacturer for repairs. Please do not forget to describe the error when sending back the device
(simply saying "the device does not work, please repair" is insufficient). Only then can the control
system be repaired quickly and inexpensively.
Troubleshooting - programming
The manufacturer can help you find a remedy if the proper documentation and data are provided. The
following are indispensable:
A hydraulic diagram by fax (best option) or e-mail (WMF, JPG, ENG)
Complete programming by means of TAPPS files or, at least, the function data by e-mail
Operating system version for the control system
All existing LOG files or at least the (temperature) values of the inputs at the time the system
malfunctioned
A telephone call to describe the problem - a written description of the error does often not suf-
fice, and the manufacturer cannot accept it.
Troubleshooting in the CAN network
To localize the error, switching off of a part of the network at a time in order to see when the error
disappears is recommended.
General tests:
Node numbers - no node number may be allocated twice
Power supply to the bus members (if necessary use the power pack CAN-NT)
Setting of the baud rate (only if using the CAN bus converter CAN-BC/C)
Cabling tests:
For these tests all nodes must be switched off!
Resistance between CAH-H and CAN-L
o
If this is above 70
Ω
, it indicates a missing terminating resistor.
o
If the resistance is below 60
Ω
, then search for extra terminating resistors or short cir-
cuits between wires.
Check for a short circuit between GND or the shielding and the signal wires.
Checking for earth loops - to do this the shielding is disconnected at the relevant node
point and the connecting current measured. If a current exists, then an earth loop exists
courtesy of an unwanted earth connection.
