SMA SC 500HE-20 Maintenance Manua - Manual (Page 45)

SMA Solar Technology AG 7 Maintaining the Accessories
Maintenance Manual SC500-800HE20-WH-en-10 45
7.1.16 Checking the LEDs on the Measurement PCB
2. If the red LED of the operating status indicator is on, contact the SMA Service Line.
7.2 Maintaining the Sunny Main Box
7.2.1 Disconnecting the Sunny Main Box
1. If there are DC circuit-breakers in the DC sub-distributor, for example Sunny String-Monitors,
these are to be disconnected. This ensures that there is no current flowing through the
Sunny String-Monitor.
2. If there are no DC circuit-breakers in the DC sub-distributor, for example Sunny String-Monitors,
remove the fuses in the DC sub-distributor (see the DC sub-distributor installation manual).
3. If there are fuses in the Sunny Central, remove them (see the Sunny Central installation manual).
4. If there are no fuses in the Sunny Central, the maintenance can only be performed when it is
dark.
7.2.2 Maintenance Interval
Maintenance is to be performed on the Sunny String-Monitor every 24 months.
1. %"/(&3
Danger to life from electric shock or electric arc when touching live components.
• Disconnect the Sunny String-Monitor (see Section 7.1.1).
%"/(&3
Danger to life from electric shock when live components of the Sunny Main Box are
touched.
• Observe the safety rules:
– Disconnect.
– Ensure that the device cannot be reconnected.
– Ensure that no voltage or current is present.
– Cover or safeguard any adjacent live components.
• Maintenance must only be carried out when the device has been turned off and is dead.