SMA SC 500CP XT - Manual (Page 45)

Procedure:
1. Select the desired Sunny String‑Monitor from the device list.
2. Select the tab Parameters.
3. Select the parameters Group String 1 to Group String 8 and assign them to a group . Each group must include
at least four measuring channels.
4. Select the button [Save].
4.6.10.11 Setting the Tripping Time
You can use the tripping time to set the sensitivity of the string-current monitoring, since the tripping time is a factor in
the calculation of the error sum. By default, the tripping time is set to 180 minutes.
Procedure:
1. Select the desired Sunny Central String-Monitor Controller from the device list.
2. Select the tab Parameters.
3. Enter the tripping time in minutes in the parameter field SMU_T_Ausl.
4. Select the button [Save].
4.6.10.12 Setting the Tolerance
You can use the tolerance to set the sensitivity of the string-current monitoring. The tolerance is a factor in the
calculation of the error sum.
Since only a significant deviation of a measuring channel from the mean value is an indication of a faulty string, the
tolerance value should be set correspondingly high. Minor deviations are considered normal.
Procedure:
1. Select the desired Sunny Central String-Monitor Controller from the device list.
2. Select the tab Parameters.
3. Enter the tolerance value in percent for the groups in the parameter fields SMU_tolerance grp1 to
SMU_tolerance grp3.
4. Select the button [Save].
4.6.11 Configuring the Zone Monitoring
For configuring the Zone Monitoring, enter the maximum input currents for each input and set the tolerance (see
Section 10.6, page 115). A tolerance value of 4% or more is recommended.
For activating the error analysis, the parameter AlarmEna has to be set to On. In this case, an error message is
generated, if the input current is lower or higher than the set tolerance value. If the error analysis is deactivated, the
communication interface sends the measured value without analysing them. You can activate the alarm under fault
conditions in order to receive an e-mail with the error message (see Section 7.2, page 65).
Requirement:
☐ At least two inputs have to be configured in order to activate the Zone Monitoring.
Procedure:
1. Call up the parameter overview (see Section 9.3.1, page 81).
2. In the parameters DcCfg.AmpMax[1] to DcCfg.AmpMax[8], enter the maximum input currents in ampere.
3. In parameter MaxTol, enter the tolerance value in percent.
4. Set the parameter AlarmEna to On. Thus, you activate the error analysis.
5. Save the parameter changes (see Section 9.3.2, page 81).
4 Commissioning SMA Solar Technology AG
User Manual 45 SCCPXT-BA-E4-en-54