SolarMax SM30HT4 - Page 32

32
Contact Description
NA21 Control line terminal / external shutdown of MPP trackers 1 and 2
NA22 Control line terminal / external shutdown of MPP trackers 3 and 4
NA1 Neutral conductor terminal
For as long as the signal (phase voltage) of the external grid monitoring system is live
on the NA21 / NA22 contacts, the respective MPP trackers can feed into the mains grid.
When the signal stops, the K1/K3 or K3/K4 (see Section 3.6) grid relays of the inverter are
opened. This immediately disconnects the inverter from the grid.
The control line of the external grid monitoring system should be connected to the two
contacts, NA21 and NA22, using a bridge. When only one contact is connected, only that
one MPP tracker will feed into the grid. When the status signaling contacts are in use (see
Section 5.6) the external shutdown function cannot be used.
Connection conditions
 Connection type: 3-pole connector (included in the delivery)
 Permissible conductor cross sections: 0.25 to 2.5 mm
2
 Multiple cable gland; permissible cable Ø: 5.5 to 7.0 mm
 Nominal input voltage 230 VAC
Procedure
1. Remove the cover of the inverter as described in Section 5.1.
WARNING!
Fatal electric shock hazard!
The control line of the thermal grid monitoring system may be live with mains
voltage.
 Ensure that the control line is not live during connection work.
2. Thread the cable through the multiple cable gland.
3. Connect the control line to the 3-pole connector (Figure 23/No. 2) as follows:
– Wire stripping length: 7 mm
– Tightening torque: 0.5 to 0.6 Nm