Troubleshooting
© 2016 Hirschmann Automation and Control GmbH · Mobile Machine Control Solutions · www.beldensolutions.com 53/161
qSCALE i2 Cranes (Tool Version 3.0.34) Service Manual / Issue B / 11-2017 / ac.
The CAN Bus requires that 120 Ohm resistors be at each end of the CAN BUS. The resistors in parallel
yield 60 Ohms of resistance between the CAN High and CAN Low cables.
The signals are generated by nodes on the CAN BUS. The nodes generate and consume data over the
CAN Bus. The CAN High and CAN Low signals are equal and opposite of each other in amplitude and
have the same duration (refer to image above for visual).
Adequate voltage supply is required for all nodes on a CAN Bus. A common source of issues is Voltage
drop due to added resistance from a corroded connection. As resistance increases, a corresponding
voltage drop occurs corrupting the signal generated. The CAN signal will begin to lose the top of the
high signal and no longer mirror the reflection (parity) of the CAN low signal.
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