"Measures against RCD/RCMU false trips"
(when using a 30 mA residual current circuit breaker)
NOTE!
The national regulations of the grid operator or other factors may require a re-
sidual current circuit breaker in the AC connection lead.
For this situation, a type A residual-current circuit breaker is generally adequate.
Nevertheless, false alarms can be triggered for the type A residual-current cir-
cuit breaker in individual cases and depending on local conditions. For this reas-
on, in accordance with national legislation, Fronius recommends that a residual-
current circuit breaker with a tripping current of at least 100 mA suitable for fre-
quency converters be used.
Parameter Value range Description
"Inverter shut-
down before
30 mA RCD
trips"
0 No measures to prevent false tripping.
1 The inverter switches off at 15 mA before
the residual current circuit breaker trips.
"Leakage cur-
rent factor to
reduce
RCMU/RCD
false trips"
(only for Symo
GEN24)
0 ‑ 0.25
(default: 0.16)
Reducing the setting value reduces the
leakage current and raises the intermedi-
ate circuit voltage, which slightly reduces
the efficiency. Setting value 0.16 enables
optimum efficiency.
"Iso Warning"
Parameter Value range Description
"Iso Warning" Off The isolation warning is deactivated.
On The isolation warning is activated.
A warning is issued in the event of an isola-
tion fault.
"Iso Alternative
Mode"
Accurate Isolation monitoring is performed with the
highest accuracy and the measured insula-
tion resistance is displayed on the user in-
terface of the inverter.
Fast Isolation monitoring is performed with
lower accuracy, which shortens the dura-
tion of the isolation measurement, and the
isolation value is not displayed on the user
interface of the inverter.
"Isolation
Warning
Threshold"
100,000 ‑
10,000,000 Ω
If this threshold is undershot, status code
1083 is displayed on the user interface of
the inverter.
"Backup Power"
Parameter Value range Description
"Backup Nom-
inal Voltage"
220 ‑ 240 V Is the nominal phase voltage output in
backup power mode.
87
EN
To Next Page
Loading...
