4 Product Description
SMA Solar Technology America LLC
Installation Manual
RSS-US-IA-xx-14
11
4
Product Description
4.1
Rapid Shutdown System
The Rapid Shutdown System consists of one or more Rapid Shutdown Boxes and one Rapid
Shutdown Controller. PV systems equipped with the Rapid Shutdown System satisfy the
requirements of UL 1741, Second Edition 2015 and Canadian Electrical Code 2015. The Rapid
Shutdown Controller activates and deactivates the Rapid Shutdown System and signals the status
of the Rapid Shutdown System via the green and red LEDs. The Rapid Shutdown Box electrically
discharges the PV array conductors from the Rapid Shutdown Box to the inverter within ten seconds
of activation of the emergency switch on the Rapid Shutdown Controller to ≤ 30 V. This is done by
the disconnection of the PV array on the input side of the Rapid Shutdown Box while the stored
leading energy of the inverters is discharged simultaneously. When the irradiation on the PV array
is sufficient and the voltages have been electrically discharged in accordance with specification, the
green LED on the Rapid Shutdown Controller glows green constantly. When none of the LEDs of the
Rapid Shutdown Controllers are glowing after actuating the emergency switch, either the irradiation
on the PV array is too low and, thus, the supply voltage of the Rapid Shutdown System insufficient
or the installation of the Rapid Shutdown System is faulty or the Rapid Shutdown Box is defective.
A
D
E
1 ... 16
B
C
Figure 2 : Schematic diagram of a Rapid Shutdown system
Position
Designation
A
Rapid Shutdown Controller
B
PV modules
C
Rapid Shutdown Box
D
Inverter
E
Utility grid
ENGLISH
Summary of Contents for RSB-2S-US-10
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