WCS-10 User manual
14
Copyright © TK Engineering Oy 2009 - 2017
2.5 Termination
ﾧ
CAN H
CAN L
Resistor 120
Ω 1W
External
Jump wire
Inside WCS-10
Outside WCS-10
CAN transceiver
Connector
Term
CAN L
CAN H
Figure 4: Internal termination
The WCS-10 has internal termination resistors. By installing a “jump” wire from CAN term to
CAN L the CAN bus can be terminated. CAN 4 is always terminated at the WCS-10.
2.6 Power supply
The WCS-10 must be powered by DC voltage from 10 to 40 Volt. The WCS-10 has dual power
inputs and can be powered on both simultaneous or on only one of the two. The max power
consumption when stress tested was 3,5W. In normal operation the power consumption is about
3W.
Table 1: Power supply characteristics
Info
Max
Min
Recommended/Normal
Voltage supply
40VDC
10VDC
12VDC or 24VDC
Power usage
3,5W
2W
3W
2.7 Transceivers
The WCS-10 uses Philips TJA1050 CAN transceivers
2.8 Isolation
Four of the five CAN ports on the WCS-10 are galvanic isolated. The ports that are isolated are
CAN 1, CAN 2, CAN 3 and CAN 4. The CAN A port is not isolated. The data lines are isolated
with ADuM 1201. DC/DC isolations are done with C&D NTE0505.
2.9 PE Grounding
The WCS-10 X14 ground strip need to be connected to a high quality ground point for WCS-10 to
fulfill EMC requirements.
