SMA WB 3000-21 Installation - Manual (Page 21)

SMA Solar Technology AG 4 Product Description
Installation Manual WB3-5TL-21-IA-en-10 21
4.7 Slot for Multi-Function Interface
The inverter has a slot for a multi-function interface. This slot is designed to connect a simple
multi-function relay, an SMA Power Control Module, or a fan retrofit kit. The multi-function interface
can be retrofitted or installed by default with the respective order.
Multi-Function Relay
You can configure the multi-function relay for various operating modes. The multi-function relay is
used, for example, to switch error indicators on or off (for information on installation and
configuration, see installation manual of the multi-function relay).
SMA Power Control Module
The SMA Power Control Module enables the inverter to implement grid management and is equipped
with an additional multi-function relay (for information on installation and configuration, see the
SMA Power Control Module installation manual).
Fan Retrofit Kit
The fan retrofit kit is used for additional inverter cooling at high ambient temperatures and also has a
multi-function relay (for information on installation and configuration, see the fan retrofit kit installation
manual). The fan retrofit kit and the SMA Power Control Module cannot be operated in parallel.
4.8 Grid Management
The inverter is equipped with grid management functions.
Depending on the requirements of the grid operator, you can activate and configure the functions
(e.g. provision of reactive power, active power limitation) via operating parameters (for information
on the functions and operating parameters, see the Technical Description "Measured Values and
Parameters" at www.SMA-Solar.com).
4.9 Varistors
Varistors are voltage-dependent resistors that protect the inverters against overvoltage. The inverter is
equipped with thermally monitored varistors.
Varistors can become worn and lose their protective function with age or repeated strain as a result
of overvoltage. The inverter detects if one of the varistors is defective and displays an error message.
The varistors are specially manufactured for use in the inverter and are not commercially available.
You must order new varistors directly from SMA Solar Technology AG.