RU , GSE, FOTO CONTROL, QUATROFREM v.2.53x
15. apríla 2019
Page 36 from 97
7.1.1 STRING CHECK
Group of parameters number [804]
Settings of parameters for DC leakage current evaluation and avaluation of unbalances and measurement
error of string currents sum.
MENU \ SETTINGS \ FOTOCONTROL / PEG \ STRING CHECK
Name [ID]
Description
Def.
String
check
[747]
This parameter determines the method of string current [735] (page 15) check, and
relevant warnings or faults.
□
Sum
of
strings
Turns on the check of comparison of string current sum to the total DC current. This test
generates warning W25-Sum of string currents (page 30).
□
String
balance
Turns on the check of string balance. If the maximum difference of two string exceeds the
value of String balance [749] (page 36), warning W26-String balance (page 30) is
generated.
□ DC leakage
test
Enables check of the maximum permissible total DC current when not in operation and at
disconnected AC contactor. This test generates the fault E48-DC leakage (page 34).
String
sum
[748]
It determines, what the value of difference between string current sum (see [735]
(page 15)) from the Sum DC currents [634] (page 15) can be. 100% represents
maximum range of string current measurement.
10.0
%
1.0 % ÷ 100.0
%
String balance
[749]
It determines, what the value of difference between individual string currents (see
[735] (page 15)) can be. 100% represents maximum range of string current
measurement.
30.0
%
1.0 % ÷ 100.0
%
Unbalance on
time [929]
This parameter determines the time how long the unbalance has to be higher than
the value of String balance [749] (page 36), to display warning W26-String balance
(page 30).
30.00
s
0.00
s
÷
7200.00 s
Unbalance off
time [930]
This parameter determines the time how long the unbalance has to be higher than
the value of String balance [749] (page 36), to cancel warning W26-String balance
(page 30).
30.00
s
0.00
s
÷
7200.00 s
Max.
DC
current
in
STOP [854]
Specifies the maximum current value Sum DC currents [634] (page 15) that can flow
to the DC side while not in operation and AC contactor switched off. If the threshold is
exceeded for more than Filter I_DC leakage [869] (page 36) and "DC leakage test" is
turned on, a fault E48-DC leakage (page 34) is generated.
30.00
A
0.01
A
÷
1000.00 A
This is a criterion for leaking DC current test, which can be caused by the fault of DC current
sensors or by the damage of passive elements of the inverter.
Filter
I_DC
leakage [869]
Response time of the inverter to the exceeding of the leakage current and E48-DC
leakage (page 34) fault generation.
2.0 s
0.0 s ÷ 3000.0 s It serves to filter short-term transients.
7.1.2 EFFICIENCY CHECK
Group of parameters number [864]
Parameters for turning on/off and configuration of efficiency decrease evaluation during energy production.
MENU \ SETTINGS \ FOTOCONTROL / PEG \ EFFICIENCY CHECK
Name [ID]
Description
Def.
Efficiency
decrease [865]
Turning on the check of the inverter efficiency.
Decrease in efficiency of the converter may indicate an error in the measurement
of electrical quantities or may be a sign of damage to the hardware components of
the inverter.
not
tested
not tested
Efficiency decrease is not tested.
warning
If Inv. efficiency [859] (page 15) drops below Min. efficiency [866] (page 37) for the time
