ABB PRO-33.0-TL Series, Service Manual

Page: 29 / 122

Program features 29
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
174.31 Reverse input current limit
so that the inverter recognizes the reverse current. Reverse input current detection is
enabled/disabled with parameter
174.30 Reverse input current detection . Reverse current
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
174.13 Reverse string current limit , so that it
recognizes the reverse current direction. Reverse current detection is enabled with
parameter
174.12 Reverse string current detection .
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] -- 174.57 Current: [8]

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
174.22 Blown fuse detection . Blown fuse is detected if
the string current is around 0.0 A in an activated string and the average string current is
greater than
174.22 Blown fuse detection .
Settings
174.11 Input connection status