SMA Wireless-Set485-01 - Manual (Page 28)

Troubleshooting SMA Solar Technology AG
28 WirelessSet485-IEN091511 Installation Guide
9 Troubleshooting
9.1 RS485 communication unit is not working
If the LED on the radio module shows no activity, carry out the following checks in sequence.
Radio Module
1. Check whether the radio modules are switched on (see 7 "Commissioning" (page 27)).
2. Check the correspondence of the radio module pair and the radio channel of the Wireless Set.
See chapter 3.4 "Identification" (page 10). The "pair" and the "channel" must correspond for
both radio modules in a set.
RS485 Power Injector
3. Check the power supply to the RS485 Power Injector (see 7 "Commissioning" (page 27)).
4. Check whether the RS485 Power Injector is installed on the correct side (communication device
or inverter side) - see chapter 3.4 "Identification" (page 10).
5. Check the length of the cable connecting the RS485 Power Injector to the radio module. The
cable length must not exceed 30 m. This also applies to all the cabling of the Wireless-Set485-
01 and 485-02 on the communication device side.
Electrical Connection
6. Check the plug connections and cable connections of all devices, see chapter 5 "Electrical
Connection" (page 16).
7. Check the termination of the communication bus, see chapter 5 "Electrical Connection"
(page 16).
Antenna
8. Check that the opposing antenna is visible and remove any objects which may be causing
disturbance (e.g. vehicles). Change the position of the antenna if necessary.
If the measures described here are insufficient to solve the problem, contact our Service Line
(see chapter 12 "Contact" (page 32)).