Ingecon Sun 250 M220 Indoor Installation Manual page 82

Ingeteam
If the problem occurs frequently, you should check the ventilation (fans and air intake grills) of the inverter and the
enclosure in which it is installed.
• If the temperature shown is less than 60 °c and the alarm persists, the problem could be in the thermal
switch built into the inverter in the electronics block heat sink.
• If the displayed temperature is abnormally low (compared to room temperature), the root of the problem
could be with the nTc built into the inverter.
checking the nTc
To check the nTc of the unit you will need to access the J18 terminal of the intake board. This terminal is located
under the control board and the intake board as shown in the following pictures.
In terminal J18, do not connect wires coming into J18.1 and J18.2, and
use a multimeter to measure resistance between them. The resistance
measured should be approximately 5 kOhm at around 25 °c ambient
temperature.
Rewire the nTc on the J18.1 and J18.2 connector and measure resist-
ance between connector pins themselves with the multimeter. The resist-
ance measured should be approximately 1 kOmh.
In case any anomaly in the inverter's nTc is found, contact technical
support.
82
Control board
Intake board
Location of the control board and the intake board
Installation manual
A
J18
J13
J14
A
J18
J20
J11 J10
J15
J17
J31
J16
J12
J3
J4
J21
J5
J32
J6
J7
J1
J27 J28
J19
AAV2000IKI01