SMA PPM-10 - Connecting the Control System of the Gensets Via CAN Network

6 Electrical Connection
SMA Solar Technology AG
Installation ManualPPM-10-IA-en-1650
6.6 Connecting the Control System of the Gensets via CAN Network
You can connect the product to a CAN network using a D-sub connector. The product can communicate with the
genset controllers via the CAN network.
D-sub plug assignment:
A
B
C
D E
F
G
H
I
Figure 23: D-sub plug assignment
Position Pin Signal
A 1 –
B 2 CAN_L
C 3 CAN_GND
D 4 –
E 5 –
F 6 –
G 7 CAN_H
H 8 ‒
I 9 –
Interference of network data transmission due to AC cables
When AC cables are in operation, they generate an electromagnetic field which may induce leading or lagging
interference in network cables during data transmission.
• Lay the network cables using suitable fastening material while observing a minimum clearance of 50m
(164ft) to the AC cables.
Interference of network data transmission due to missing terminator
The CAN network must be terminated at both ends of the network bus with 1 terminator of 120Ω per end. If the
terminators are missing, disturbances in the data transmission can occur.
• Insert the terminator between pinB (CAN_L) and pin7 (CAN_H) at both ends of the network bus,
respectively.
Cable requirements:
☐ Conductor cross-section: at least 2 x 2 x 0.25 mm² (2 x 2 x 24 AWG)
☐ Twisted pair conductors
☐ Cable with shielding: Yes
☐ Plug type: D-sub 9 (female, with holes)
☐ The maximum cable length in the network bus depends on the baud rate set and may not be exceeded. Example:
For a baud rate of 250kbit/s, the maximum cable length is 50m (164ft).