Setting The Tolerance; Configuring The Remote Shutdown; Deactivating The "Fully Hermetic" Transformer Protection - SMA SUNNY CENTRAL 500CP-JP User Manual

6 Communication with the Inverter
6.4.6

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 Parameters tab.
3. Enter the tolerance value in percent for the groups in the parameter fields SMU_tolerance grp1 to
SMU_tolerance grp3.
4. Confirm the entry with [Save].

6.5 Configuring the Remote Shutdown

The Sunny Central can be shut down and switched off via an external signal. To do this, two terminals of the customer
terminal plate are switched with 24 V (see Sunny Central installation manual).
To use this function, the associated parameter must be activated.
Procedure:
1. Ensure that the Sunny Central is in the operating state "Stop".
2. Log into the user interface.
3. Enter the password in the appropriate field on the homepage and confirm with [Login].
4. Set the parameter ExlStrStpEna on the user interface to On (see Section 6.2, page 40).
5. Confirm the parameter entry with [Save].

6.6 Deactivating the "Fully Hermetic" Transformer Protection

A fully hermetic protector can be connected to the Sunny Central. This fully hermetic protector is integrated in the
MV transformer.
If an error occurs in the MV transformer, the Sunny Central immediately shuts down. Two 230 V/50 Hz terminals are
connected to the customer terminal plate (see Sunny Central installation manual).
To deactivate this function, the associated parameter must be disabled.
Procedure:
1. Ensure that the Sunny Central is in the operating state "Stop".
2. Log into the user interface.
3. On the user interface, set the parameter ExlTrfErrEna to Off (see Section 6.2, page 40).
4. Confirm the parameter entry with [Save].
44 SCCP-JP-BA-A4-en-12
SMA Solar Technology AG
User Manual