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EN / SunMaster CS15TL RP / CS20TL RP / CS30TL RP
10.6.2 PV array earthing
If the PV array is not grounded and local regulations require
this, it is allowed to ground the neutral at the transformer
side (TN network)
If the PV array is functionally earthed it is recommended
to use a separate transformer for each inverter, or to use a
transformer with multiple isolated windings.
10.6.3 CS-IT20 transformers
The CS-IT20 isolation transformer is designed to provide
the necessary isolation for one CS20 inverter. It features a
MasterBus controlled relay to switch off during the night,
reducing night-time losses to a minimum
Figure 10-13 shows how the MasterBus network can be in-
stalled to a CS-IT20 transformer. MasterBus supports cable
lengths up to 100m.
When installed, the CS inverter will automatically detect the
transformer relay and load all appropriate settings. No user
configuration is necessary to set up the transformer control.
If desired, the transformer control can be switched off in the
display menu. Refer to section 8.9.2.2 for instructions.
10.6.4 MasterBus connections
The CS-IT20 transformer is equipped with a MasterBus relay
for MasterBus controlled switching. Network A is used for
this purpose. Refer to figure 5-7 and chapter 5.
Figure 10-13: MasterBus network A: CS-IT20, CS20TL, CS30TL,
StringMaster Pro
485
485
A B
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