14 Safety
Isolating the inverter from external power sources
Notes:
WARNING! Do not use excessive force to remove or replace the front or
bottom covers. The DC switch must be turned OFF before the covers can be
removed. Covers must be replaced before the DC switch can be turned ON.
• The DC connection terminals (DC+ and DC-) carry dangerous voltages (up to
900 V). Even in dim conditions, the solar array supplies voltage to the inverter.
• Do not disconnect DC connectors while they are under load. Protect disconnected
DC connectors from the ingress of water and dirt by using DC connector sealing
caps.
• The DC power switch on the front panel only turns the inverter on and off. It does
not completely isolate the inverter from the solar arrays or the electrical grid.
• Dangerous voltages can be present at the terminals of the AC and DC cables
when they are not connected to the inverter. Handle disconnected cables
carefully.
Grounding safety (PE)
WARNING! Ignoring the following instructions can cause injury or death,
increased electromagnetic interference and equipment malfunction.
Isolating the inverter from external power sources
1 Turn off the main disconnector and circuit breaker(s) at the AC distribution board.
2 Turn the DC switch on the front of the inverter to the OFF position. The DC switch does
not completely isolate the DC input connectors from the solar array.
3 If applicable, turn off disconnecting switches and circuit breakers between the inverter
and solar array(s).
4 Disconnect the DC cables from the inverter to ensure complete isolation from the solar
array(s).
5 Disconnect the AC cable from the inverter to ensure complete isolation from the electrical
grid.
Note: Although the inverter’s automatic disconnection switches isolate the inverter
electronics and solar array(s) from the electrical grid, they do not completely isolate the
inverter from the electrical grid. High AC voltage can still be present inside the inverter
and at the AC cable terminations.
6 Disconnect any external power sources connected to the control connectors (for
example, to the relay output).
7 Use a multimeter (impedance >1 M
Ω) to check that there is no voltage between ground
and the inverter input and output terminals.
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