SMA Solar Technology AG
12. Use an appropriate measuring device to ensure that
no voltage is present at the AC terminal block
between L1 and PE, L2 and PE, and L3 and PE.
13. Ensure that no voltage is present between any terminal of the multifunction relay and PE of the
AC terminal block.
14. Discharge the AC power controller assembly at the contact points using a voltage detector
without intrinsic voltage source:
• DC+/DC-
• DC+/PE
Replacement Manual
5 Disconnecting the Inverter from Voltage Sources
STPTL-20-Display-RM-de-10
15