Eltek Valere Theia He-t User Manual page 72

AC Side
• No alarms are raised regarding the condition of the varistors on the AC side. Therefore, they
need to be checked regularly (at least once per year) or after lightning strikes.
• Replace the damaged varistor with DC Varistor Kit ordered from Eltek Valere, part number
263574.
Figure 8.2.6: Varistors on the AC side
Figure 8.2.7: Checking the AC varistors
Figure 8.2.8: Service tool to open the terminals
72
User Manual THEIA HE-t String Inverters
The three varistors on the
AC side are located in the
right side of the
connection area above the
AC terminal area.
Note the orientation of
the varistors if they need
to be replaced.
Measure the ohms
between the terminal and
the bended pin on each
varistor:
1– 2
GND - Left VDR: 0 Ω
3 – 4
N – Middle VDR: 0 Ω
5 – 6
L –Right VDR: 0 Ω
If a measurement is high-
ohmic the varistor is
damaged.
Use the service tool
delivered in the packaging
with the new varistors
from Eltek Valere to open
the terminal clamps and
remove the damaged
varistor(s).
Also use the service tool
to open the clamps when
inserting the new
varistor(s).
357115.013, Issue 1.0, 2011 March