"Measure against RCD false triggers"
(when using a 30 mA residual current circuit breaker)
NOTE!
National regulations, the grid operator's specifications or other factors may re-
quire a residual current circuit breaker in the AC connection lead.
For this situation, a type A residual current circuit breaker is generally adequate. Never-
theless, false alarms can be triggered for the type A residual current circuit breaker in in-
dividual cases and depending on local conditions. For this reason, in accordance with
national legislation, Fronius recommends that a residual current circuit breaker with a
tripping current of at least 100 mA suitable for frequency converters be used.
Parameter Range of val-
ues
Description
"Switch-Off be-
fore 30mA RCD
Trip" (only for
Primo GEN24)
0 No measures to prevent false tripping.
1 The inverter switches off at 15 mA before the
residual current circuit breaker trips.
"Leakage Current
Factor" (only for
Symo GEN24)
0 ‑ 0.25
(default: 0.16)
Reducing the setting value reduces the leak-
age current and raises the intermediate circuit
voltage, which slightly reduces the efficiency.
Setting value 0.16 enables optimum efficiency.
"Iso Warning"
Parameter Range of val-
ues
Description
"Iso Warning" Off The isolation warning is deactivated.
On The isolation warning is activated.
A warning is issued in the event of an isolation
fault.
"Iso Alternative
Mode"
Accurate Isolation monitoring is performed with the
highest accuracy and the measured insulation
resistance is displayed on the user interface of
the inverter.
Fast Isolation monitoring is performed with lower
accuracy, which shortens the duration of the
isolation measurement, and the isolation value
is not displayed on the user interface of the in-
verter.
"Isolation Warn-
ing Threshold"
100,000 ‑
10,000,000 Ω
If this threshold is undershot, status code 1083
is displayed on the user interface of the invert-
er.
"Backup Power"
Parameter Range of val-
ues
Description
"Backup Nominal
Voltage"
220 ‑ 240 V Is the nominal phase voltage output in backup
power mode.
99
EN
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