Kaco blueplanet 15.0 TL3, Руководство пользователя, Страница: 30 / 96

7.8.4 Connecting the RS485 Bus
NOTE
Ensure that the DATA+ and DATA- wires are properly connected. Communication is not possible if the wires are
reversed! Different manufacturers do not always interpret the standard on which the RS485 protocol is based
in the same way. Note that the wire designations (DATA- and DATA+) for wires A and B may vary from one
manufacturer to another.
A B
GND
A B
GND
A B
GND
A B
GND
A B
GND
A B
GND
4 1 2 2 3
5
Fig. 30: RS485 interface wiring diagram
1 Inverter, terminal unit 4 Communication
2 Inverter 5 Power supply
3 Data monitoring unit
Properties of the RS485 data line
Maximum length of the RS485 bus line Max. 1200 m
This length can be reached only under optimum conditions.
Cable lengths exceeding 500 m generally require a repeater
or a hub.
Maximum number of connected bus devices 99 d 1 data monitoring unit
Data line Twisted, shielded.
Recommendation Li2YCYv (twisted pair) black for laying cable outside and in
the ground, 2 x 2 x 0.5 mm²
Li2YCY (twisted pair) grey for dry and damp indoor spaces, 2
x 2 x 0.5 mm²
↻ To prevent interference during data transmission:
- Observe the wire pairing when connecting DATA+ and DATA-.
Do not lay RS485 bus lines in the vicinity of live DC/AC cables.
1. Loosen the cable fitting [ W_20]
2. Thread the connection cables through the cable fitting.
3. Open and close the door completely to check that the connection cable is not
subject to tensile or compressive forces.
4. Connect the connection cable to the corresponding connection terminals.
5. The following must be connected to all inverters and to the data monitor unit in
the same way:
- Wire A (-) to wire A (-) and wire B (+) to wire B (+)
- GND to GND
6. Secure cable ties.
7. Tighten the cable fittings [ W_20 / 1.5 Nm]
Fig. 31: Assignment of twisted-pair
wires
NOTE
When using the RS485 bus system, assign a unique address to every bus device (inverter, sensor) and terminate
the terminal units (see the “Settings” menu) .
↻ Check whether one of the devices represents the terminal unit.
F Only activate the terminating resistor on the communication circuit board of the terminal unit using the DIP switch.
7 | Installation Manual
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