Device Concept; System Limitations; Maximum Distance Between The Rapid Shutdown Box And The Pv Array - Fronius Rapid Shutdown Box - Duo Installation Instructions Manual

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Industry Canada RSS
The device corresponds to the license-free Industry Canada RSS standards. Op-
eration is subject to the following conditions:
(1) The device may not cause harmful interference
(2) The device must accept any interference received, including interference that
may cause undesired operation.

Device concept

The Rapid Shutdown Box provides a convenient and safe way to comply with Art-
icle 690.12 in the 2014 Edition of the National Electrical Code. The device is
powered directly by the PV array and is controlled depending on the state of the
signal port. This signal port can be controlled by a relay terminal in the SnapIN-
verter Series. The use of a DC relay, which also functions as a switch-disconnect-
or, ensures that the PV array is galvanically isolated in the case of a Rapid Shut-
down.
The Rapid Shutdown Box ensures that residual energy in the capacitors of the in-
verter is discharged within the required time period. To ensure that the entire
system functions correctly, the signal ports of all Rapid Shutdown Boxes must be
serially connected (see section "Connecting the Rapid Shutdown Box"). For this
purpose, Duo and Quattro variants of the device and also the discontinued ver-
sions RSB Single and RSB Multi can be mixed randomly.
The Rapid Shutdown can be initialized by means of AC failure if the signal lines
are connected to the inverter. Alternatively or additionally, an emergency stop
button that interrupts the signal wires can be used.
System Limita-
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tions -
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Maximum Dis-
tance Between
the Rapid Shut-
down Box and
the PV Array
6
adjust or reposition the receiving antenna
increase the distance between the device and the receiver
connect the device to another circuit, which does not include the receiver
for further support, please contact the retailer or an experienced radio/TV
technician.
Maximum number of Rapid Shutdown Boxes per inverter: 5
Maximum line resistance permitted in the signal loop: 300 W
Maximum permissible wire length for signal loop using AWG 14, 16, 18 or 20:
3200ft (1000m)