SMA SB 4200TL Multi-String - Manual (Page 18)

Device Description SMA Technologie AG
Page 18 SB4200-12:FE4804 Operating Instructions
Derating
The operating state „Derating“ can have several causes:
• The temperature monitoring of the Sunny Boy 4200TL Multi-String has reduced
the output power to prevent the device from overheating. If this happens often,
heat dissipation might be insufficient.
• To avoid unnecessary yield losses, it should be checked in this case whether the
Sunny Boy 4200TL Multi-String can be mounted at a more appropriate place with
better ventilation.
• The input power is too high and the Sunny Boy 4200TL Multi-String is operating
at its operating limits.
• The current from one of the strings is about to exceed 7.5 A and the Sunny Boy
4200TL Multi-String is reducing this current to 7.5 A in order to prevent any da-
mage.
• The input power from the different strings is being internally reconfigured. In this
case the message should dissapear within a few moments.
Insulation Failure
The red LED on the Sunny Boy
4200TL Multi-String is on, which indi-
cates an earth fault.
Please contact a qualified electrician who will remove the fai-
lure following the instructions in the „Installation Guide“.
1 s
Green LED is shortly
off once per second
Green LED is blinking
once per second
Red LED is
permanently on