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Appendix
CAN Bus Termination
USB A-B cable
(standard)
1
End-of-Line
Resistor
120Ω
Minipack
DC Power System
CAN Bus Addressing
All rectifiers, Smartpack controllers and other control units connected to the Eltek Valere's CAN
bus must have a unique address or ID number. The control system's master controller assigns
automatically the rectifiers' addresses (software assignment). The controller registers the
rectifiers' ID numbers – or CAN bus address (01, 02 ...) – together with their Serial Numbers.
The control system's controllers and control units use DIP switches for configuring their unique
CAN bus ID number (hardware assignment).
You can address a maximum of 14 control units of each type – Smartpack controllers, Smartnode
units, Battery Monitors, Load Monitors, etc. – to the control system's CAN bus. See table below:
Number of nodes
Smartpack controllers
Smartnodes
Battery Monitor CAN nodes
Load Monitor CAN nodes
I/O Monitor CAN nodes
Mains Monitor nodes
ID numbers formatted in italics (column 15 and 16 and range 65-78) are not available due to
software constraints. For DIP switch configuration, refer to chapter "CAN Bus Nodes", page 24.
The figure shows a Minipack DC power system expanded with 3 CAN nodes to implement
additional digital inputs, relay outputs or similar functionality.
CAN bus
(twisted-pair CAT5 cable)
ID Number
Battery
Monitor
Battery string #1
Minipack
DC Power System
14
CAN bus
(twisted-pair internal
CAT5 cable)
120Ω
End-of-Line
Resistor
01
02
n
1
2
3
4
5
6
1
2
3
4
5
6
17
18
19
20
21
22
33
34
35
36
37
38
49
50
51
52
53
54
65
66
67
68
69
70
81
82
83
84
85
86
97
98
99
100
101
102
Alarm Outputs
NC-C-NO
Digital Inputs
Smartpack
1
controller, Master
CAN bus
01
02
33
81
Temp, Fan Speed Mon & Ctrl
Config. Inputs
Quick Start Guide Minipack PS System
Minipack systems are shipped from factory
with the CAN bus already terminated with
120Ω resistors.
To ensure a correct bus communication and
avoid data reflection, you must always
terminate the CAN bus with two 120Ω
resistors, one at each end of the line (60Ω
bus impedance). The figure shows a
Minipack
system
communicating with the rectifiers via the
CAN bus.
7
8
9
10
11
7
8
9
10
11
23
24
25
26
27
39
40
41
42
43
55
56
57
58
59
71
72
73
74
75
87
88
89
90
91
103
104
105
106
107
USB A-B cable (standard)
120Ω
Minipack Rectifiers
n
49
CAN bus
I/O Monitor
Load Monitor
Alarm Outputs NC-C-NO
Communication
with
its
controller
12
13
14
15
16
12
13
14
15
16
28
29
30
31
32
44
45
46
47
48
63
64
60
61
62
76
77
78
79
80
92
93
94
95
96
108
109
110
111
112
120Ω
End-of-Line
Resistor
Shunts
Current Monitoring
Sense Inputs
Fuses
Fuse Monitoring
Configurable Inputs
356808.103, 1v2-2008-10
<-- ID #
<-- ID #
<-- ID #
<-- ID #
<-- ID #
<-- ID #
<-- ID #
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