Siemens LMV5 Series Technical Instructions page 38

Technical Instructions
Document No. LV5-1000
CANbus (continued)
The shield of the CANbus cable must be connected on each cable segment (between the LMV5 and the
actuators or PLL52 module) so that the entire shield has continuity with terminal X51.1 which is the
shield connection on the LMV5. This is achieved by clamping the shield on both cable segments with the
metal clamps provided on the cable entry of each actuator. Clamps for the CANbus shield are also
provided on the PLL52 module.
The current provided by one AGG5.210 transformer is usually sufficient to meet the demands of the
LMV5 base unit, AZL5 and actuators on a typical burner / boiler without a PLL52 module. However,
situations occur when one AGG5.210 transformer is not sufficient, and a second transformer must be
used. The figure below outlines the number of transformers that should be used for different situations.
Number and type of actuators
wired on the CANbus
moving concurrently.
2 SQM45
3 SQM45
0 SQM48
4 SQM45
5 SQM45
1 SQM45
2 SQM45
1 SQM48
3 SQM45
4 SQM45
1 SQM45
2 SQM45 2 SQM48
3 SQM45
1 SQM45
3 SQM48
2 SQM45
1 SQM45 4 SQM48
2 SQM48
3 SQM48
0 SQM45
4 SQM48
5 SQM48
Notes:
When two transformers are used, the loading should be divided between the two
•
transformers as equally as possible.
The second transformer should be placed as close as possible to the actuators / PLL52
•
module that it powers due to voltage drop considerations.
When adding a PLL52 module, subtract 20 ft from the cable length on the chart.
•
Absolute maximum cable length is 300 ft (CANbus communication limitation).
•
Never connect the 12VAC1 / 12VAC2 from one transformer to 12VAC1 / 12VAC2 on
•
any other transformer.
Section 2
Permissible total CANbus cable length including AZL5 (feet).
Single Transformer
Actuators at 100% rated torque.
115
85
70
2nd Transformer Req.
85
70
2nd Transformer Req.
2nd Transformer Req.
2nd Transformer Req.
2nd & 3rd Transformer Req.
58
2nd Transformer Req.
2nd & 3rd Transformer Req.
Figure 2-1.4: CANbus Loading
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LMV Series
Actuators at 80% rated torque.
125
95
80
2nd Transformer Req.
95
80
30
2nd Transformer Req.
30
2nd Transformer Req.
2nd Transformer Req.
2nd Transformer Req.
70
2nd Transformer Req.
2nd & 3rd Transformer Req.
SCC Inc.