80
en
NOTE
When selecting an additional external earth leakage circuit breaker (ELCB), you must
remember that during operation the leakage currents can be as high as several 10mA
per inverter. That is why the rated differential current of an external ELCB must be at
least 100mA, for very large PV power plants with several MT series inverters it may
also be necessary to use a 300mA ELCB. Since the MT series inverters are designed
not to cause direct current leakage currents on the AC end, an external type A ELCB
can be used.
5 Commissioning
5.1
Switching on and off
All SolarMax inverters work completely automatically. When the PV generator supplies
enough power, the inverter switches on and then starts mains feed operation. At night,
or when the DC end is shut down, the inverter is disconnected from the grid. Operating
the inverter and the ability to communicate via the interfaces are only possible when the
inverter is switched on.
Switching on
1. Switch on the DC disconnector Q1
The inverter switches on; after a couple of seconds, the graphics display is activated
(assuming there is enough power coming from the PV generator)
2. Switch on the external AC disconnector
The inverter switches to mains feed operation after roughly 30 seconds
Switching off
DANGER
The DC-end MC connectors may only be disconnected from the inverter if the DC
disconnector (Q1) is open. If the disconnector is not open, disconnecting the DC feed
lines during operation can result in dangerous arcs.
1. Switch off external AC disconnector (optional)
The inverter is disconnected from the grid
2. Switch off the DC disconnector Q1
The inverter shuts off after a few seconds
Summary of Contents for 10MT2
Page 59: ...118 en ...