SMA SC 500HE-20 - Manual (Page 38)

5 SC-COM Communication SMA Solar Technology AG
38 SCxxxHE-20-BE-BEN111210 Operating Manual
5.4.3 Assigning PV Strings to Various Measuring Channels
You can assign the strings to the 8 measuring channels in order to simplify monitoring.
The number of strings per channel for the eight measuring channels can be selected from 1 to 4. The
default setting is "1".
With the parameter "No.of Strings" you can assign all the measuring channels of the
Sunny String-Monitor to a string number of 1 to 4. This avoids having to set the number of strings for
each of the individual channels, since this is automatically set for the grouped channels.
1. Select a Sunny String-Monitor from the list of devices.
2. Select the "Parameters" tab.
3. In parameter fields "No.of Strings 1" to "No.of Strings 8" enter the number of PV strings per
measuring channel or in the field "No.of Strings" the number of PV strings for all the measuring
channels.
4. Confirm entry with [Save].
5.4.4 Assigning PV strings to Different Groups
PV string data is monitored continuously and analyzed in terms of groups so that potential errors can
be detected immediately. It is hence advisable to split the PV strings into various groups if some strings
are shaded, aligned differently or equipped with different modules.
All PV strings are placed in Group 1 by default.
Group 0 is not monitored. Group 0 is not monitored, which means only PV strings excluded from
monitoring should be assigned to this group.
1. Select a Sunny String-Monitor from the list of devices.
2. Select the "Parameters" tab.
3. Select the parameters "Group String 1" to "Group String 8" and assign them to a group
(see section 5.2 "Changing Parameters", page 34). Each group must include at least
4 measuring channels.
4. Confirm entry with [Save].
5.4.5 Setting the Tripping Time
You can use the tripping time to set the sensitivity of the string current monitoring given that the tripping
time is included in the calculation of the error sum. The tripping time is set to 180 minutes as default.
1. Select a Sunny Central String-Monitor Controller from the device list.
2. Select the "Parameters" tab.
3. In the parameter field "SMU_T_Ausl." enter the tripping time in minutes.
4. Confirm entry with [Save].