SMA PPM-10 - Connecting the I;O Systems; Connecting RS485 Devices

6 Electrical Connection
SMA Solar Technology AG
Installation Manual 51PPM-10-IA-en-16
☐ Cables to be laid outdoors must be UV-resistant or routed in a UV-resistant cable channel.
☐ D-Sub9 plugs used for installation cables must have a metal enclosure.
☐ The cable shield of the installation cable must be connected at one spot on the outside of the product.
Procedure:
1. Insert the cable into the product (see Section6.10.1, page55).
2. Connect the cable at the programmable logic controller K100 to the jack CAN (X7).
6.7 Connecting the I/O Systems
The product uses I/O systems to measure and control system components. The digital inputs of the I/O systems are
supplied with a power of 24VDC and fused with 2 miniature fuses (5x20 1A, time-lag).
Cable requirements:
☐ Conductor cross-section: 0.14mm² to 1.5mm² (26AWG to 16AWG)
☐ Maximum conductor cross-section with bootlace ferrule: 1mm² (18 AWG)
Procedure:
1. Insert the cable into the product (see Section6.10.1, page55).
2. Connect the insulated conductors to the terminals X680 to X690 in accordance with the customer-specific system
circuitry. Pretension the springs of the spring-cage terminals with a screwdriver if stranded wires are used (see
Section6.10.2, page56).
3. Ensure that the insulated conductors are firmly in place.
4. Connect the cables to the I/O system and configure the channels (see manufacturer's manual).
6.8 Connecting RS485 Devices
Cable requirements:
The cable length and quality affect the quality of the signal. Observe the following cable requirements.
☐ Number of insulated conductor pairs and insulated conductor cross-section: at least 2 x 2 x 0.22 mm² (2 x 2 x
24 AWG)
☐ Maximum cable length across the entire RS485 bus: 1200m (3937ft)
☐ Twisted pair conductors
☐ Cable with shielding: Yes
☐ UV-resistant for outdoor use.
Procedure:
1. Insert the cable into the product (see Section6.10.1, page55).