String Monitoring; Reverse Input Current Detection; Reverse String Current Detection (-Sx Model); Blown Fuse Detection (-Sx Model) - ABB PRO-33.0-TL Service Manual

Settings
130.92 Active power ramping
130.93 Active power ramp
130.94 Shut down ramp
189.01 Inverter operation

String monitoring

In the -SX inverter model each individual string current is measured. The measurements
are is used to detect reverse string current, blown fuses and deviation in the measured
string currents. In the -S inverter model only the total reverse string current can be
detected.

Reverse input current detection


If reverse current is detected in the total input current, a fault is activated after a short
delay. The threshold value is initially set with parameter
so that the inverter recognizes the reverse current. Reverse input current detection is
enabled/disabled with parameter
detection is enabled by default.
Settings
174.30 Reverse input current detection
174.31 Reverse input current limit
174.32 Reverse input current delay
101.30 Input current

Reverse string current detection (-SX model)


If reverse current is detected in one of the connected strings, a warning is indicated. The
threshold value is initially set in parameter
recognizes the reverse current direction. Reverse current detection is enabled with
parameter 174.12 Reverse string current
Settings
174.12 Reverse string current detection
174.13 Reverse string current limit
174.35 Reverse string current threshold
174.36 Reverse string current delay
174.50 Current: [1]

Blown fuse detection (-SX model)


In the -SX model a warning is indicated to the user in case of a blown fuse. The blown fuse
detection is enabled with parameter
the string current is around 0.0 A in an activated string and the average string current is
greater than 174.22 Blown fuse
Settings
174.11 Input connection status
174.30 Reverse input current
-- 174.57 Current: [8]
174.22 Blown fuse
detection.
174.31 Reverse input current limit
174.13 Reverse string current
detection.
detection. Blown fuse is detected if
Program features 29
detection. Reverse current
limit, so that it