Electrical connection
Operating Instructions for Powador .-. TL_EN Page
EN
Authorised electrician
Checking the PV generator for a ground fault
DANGER
Danger to life from electric shock!
› Only touch the PV generator cables on the insulation.
› Do not connect any strings with a ground fault to the unit.
Ensure that there is no ground fault
. Determine the DC voltage between the
– protective earth (PE) and the positive cable of the PV generator, and between the
– protective earth (PE) and the negative cable of the PV generator.
If stable voltages can be measured, there is a ground fault in the DC generator or its wiring. The ratio between the
measured voltages gives an indication as to the location of this fault.
. Rectify any faults before taking further measurements.
. Determine the electrical resistance between the
– protective earth (PE) and the positive cable of the PV generator, and between the
– protective earth (PE) and the negative cable of the PV generator.
In addition, ensure that the PV generator has a total insulation resistance of more than . MOhm, since the
inverter will not feed in if the insulation resistance is too low.
. Rectify any faults before connecting the DC generator.
NOTE
The threshold value from which the insulation monitor reports a fault can be set in the "Parameter"
menu.
Insert string fuses (only for XL version)
When delivered, there are short circuit bridges inserted into the fuse holder of each of the DC positive inputs per
MPP tracker. Nothing is tted into the remaining fuse holders when delivered.
For the tting of the fuse holders with string fuses, these items are with the inverter.
CAUTION
Damage to PV generator in case of faulty design of string fuses.
If the string fuses are too large, the PV generator can be damaged by excessive current.
Select suitable string fuses depending on possible short-circuit currents and the cable cross-sections
used. Refer to this when using the string fuses supplied.
Delivery state as well as the type and number of the string fuses supplied:
Equipment types Delivery state Fuses supplied
Powador 30.0 - 48.0 TL3 XL
Short circuit bridge in string fuse 1 of
MPP trackers 1, 2 and 3
12x PV fuse x mm, A, V/DC
Powador 60.0 - 72.0 TL3 XL 15x PV fuse x mm, A, V/DC
Insert string fuses
ඣ Device switched OFF from DC isolator switch
. Open fuse holder.
. Remove and store short-circuit bridges.
. Insert suitable string fuses into the DC positive fuse holders.
. Close the fuse holders.
» Continue connecting the PV generator.
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