ABB PRO-33.0-TL Series - Block Diagram

Hardware description 27
 Block diagram
No. Component Description
1 Input terminals DC cabling from the PV arrays with PV quick connectors (-SX)
or with screw terminals (standard & -S)
2 Input board with string
fuses (-SX)
Circuit board with optional string fuses for both poles (positive
and negative) and string measurement functions.
3 String current
monitoring (-SX)
Measures the string current.
4 Monitored surge
protection (-SX)
Protects the inverter from induced voltage spikes caused by
lighting or electrostatic induction. The inverter monitors the SPD
and informs the user when it must be replaced.
5 DC switch (-S & -SX) On/Off switch to isolate the PV array from the electrical grid.
6 Input varistors Inverter overvoltage protection components. (standard & -S)
7 Reverse polarity
protection diode
Protects the inverter from reverse connected inputs.
8 Inverter DC to AC conversion and maximum power point tracker (MPPT)
9 Line filter Three-phase output current filter.
10 AC relays AC disconnecting relays.
11 AC output varistors Protects the inverter from overvoltage peaks.
12 AC terminals AC cabling connection.
13 Control board Controls and interfaces to the inverter.
14 Control and monitoring Control and monitoring circuits.
15 Extension modules Extension module slots for optional modules.
16 Monitoring interface Remote monitoring interface.
17 Control unit Removable control unit and remote control unit interface.
18 Status LEDs Inverter status LEDs on the control board.
DC1(+)
DC3(+)
DC4(+)
DC5(+)
DC2(+)
DC6(+)
DC7(+)
DC8(+)
DC1(-)
DC3(-)
DC4(-)
DC5(-)
DC2(-)
DC6(-)
DC7(-)
DC8(-)
DC+
DC-
DC+
DC-
L1
L2
L3
N
PE
1
4
2
5
6
12
13
8
15
14
3
16
17
18
9
1
1
7
3
4
10
-SX
-S
Standard
11