User Manual THEIA HE-t String Inverters 357115.013
,
Issue 1.0, 2011 April
69
8.2.5. DC Fuses
If a DC fuse blows, a message will appear in the display (See 7.2. Table of Events).
DANGER: Never work with live wires!
Always disconnect both the DC and AC side before opening the inverter lower
cover, due to the risk of electrocution.
DANGER: Be aware of power feeding modules!
The PV modules feed power when exposed to light and produce hazardous voltages,
which are still present at the terminal blocks and fuse holders after switch OFF.
Always replace the DC fuses when the PV modules are not exposed to light, or
when the PV modules are not in circuit!
Replacement Procedure
• Turn OFF both the AC circuit breaker(s) and DC switch(es).
• Remove the inverter lower cover (See 2.4.5. Inverter Structure).
• Check that the terminals are voltage free.
• Always check the cause of the defective fuse prior to replacement.
- Measure the voltage and current: If the voltage is close to or 0 V
DC
or there is a
measurable current do not remove the fuse holder. Recheck wiring for dead shorts or
reversed polarity.
• If the voltage and current measurement are correct, remove and replace the fuse(s).
• Always exchange the fuses with the same type and rating.
Figure 8.2.1: Dimensions of the DC fuses
• Make sure that the replaced fuse(s) is correctly inserted in the fuse holder.
• Fasten the inverter lower cover firmly (See 2.4.5. Inverter Structure).
• Turn on the AC circuit breaker(s) and the DC switch(es).
8.2.6. DC Disconnector Switch
To prevent welding of the contacts and hence a longer service life, the DC switch(es) must be
operated at least once per year, preferably at night or when the AC is off.
8.2.7. Inverter
It is recommended that the inside of the inverter is checked by the system installer for
humidity and dust every 3 – 4 years.
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