Table of Contents
Advertisement
5 Electrical Connection
1. Plug the jumper on the measuring board in the last
Sunny Central of each string.
2. Remove the remaining jumpers from the measuring
boards of the remaining Sunny String-Monitor.
3. Make sure that the terminating resistor at the hub in the Sunny Central is plugged into the "485
Out" RJ45 socket.
5.8 Connecting the Remote Tripping for the DC Circuit Breaker
5.8.1 Dimensioning the Connection Cable for the Operating
Current Release
Depending on the order, the Sunny String-Monitor includes a DC circuit breaker with a remote trigger.
In this case, the DC circuit breaker is equipped with a shunt release. Depending on the order, the
Sunny String-Monitor includes as a shunt release an operating current release or an undervoltage
release.
By means of the shunt release it is possible to disconnect the PV array from the inverter through the
DC switch.
The shunt release is used to switch off the DC switch in an electrically-controlled fashion. Action of the
operating current release is guaranteed at a voltage between 70 % and 110 % of the nominal
voltage of the operating current release U
release, the DC switch is triggered. This is controlled via a normally make contact. In the event of wire
breakage, loose connection, undervoltage or loss of voltage supply, the function of the operating
current release is not guaranteed. We recommend the use of an uninterrupted voltage supply. The
activation time for secure tripping of the operating current release is at least 3 seconds.
1. Determine the number of DC switches.
2. Determine the greatest distance between the Sunny String-Monitor or voltage supply and the
first Sunny String-Monitor.
3. Determine the minimum cable cross section according to figure 12.
32
SSM-TEN103132
. If there is voltage present at the operating current
N
SMA Solar Technology AG
1 2 3
L +
4 5 6
L +
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
Technical Description
L -
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
Advertisement
Table of Contents
