SMA SC 500HE-20 Installation - Manual (Page 50)

10 Cable Connection in the Connection Cabinet SMA Solar Technology AG
50 SCxxxHE-20-IA-IEN111210 Installation Manual
10.4.5 Connecting the External Target Value Specification
1. Lead the external target value specification cable into the connection cabinet (see section
10.3).
2. Connect the cable according to the circuit diagram (see section 10.4.1).
3. Remove the shield clamp from the busbar.
4. Attach the shield clamp until it clicks into place,
and fasten hand-tight.
5. Fasten the cable to the cable anchoring rail using a cable tie. This secures the cable from being
pulled off.
Signal Transmission
External target values for reactive and active power are normally specified by the distribution
grid operator, and e.g. distributed via a radio ripple control receiver. The Power Reducer Box
receives the target values from the radio ripple control receiver and sends these to the inverter
via the SC-COM. The inverter then implements the distribution grid operator specification and
feeds, for example, a specified reactive power into the power distribution grid. Ask your
distribution grid operator which signal transmission is used.
If these target values are not transmitted via the SC-COM and Power Reducer Box, there are
terminals located in the inverter for connecting the external target value specifications.
The inverter processes standard signals from 4 mA ... 20 mA.
How the external target value specification works
You will find further information on how the external target value specification works in the
inverter's operating manual.
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