ABB PVS-175-TL-US, Quick Installation Manual, Page: 29 / 44

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EN
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Checking the correct polarity of the strings and Input connection (DC)
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Do not place objects of any kind on the inverter during operation!
Do not touch the heatsink while the inverter is operating!Some parts may be very hot and cause burns.
To avoid risks of electrical shock, all wiring operations must be carried out with the DC disconnect switch internal
and external (applying LOTO procedures on it) to OFF position and with the external AC disconnect switch to OFF
position (applying LOTO procedures on it).
The DC disconnect switch disconnects the DC current from the PV panels in the “OFF” position. The inverter will
stop producing power, but DOES NOT disconnect the AC from the grid.
In case of presence of internal DC disconnect switch only, there will be live parts internal to the inverter with a con-
sequent risk of electrical shock.
Confirm the PV array’s input polarity is correct.
Confirm the PV array has no ground leakage current.
The transformerless design of the inverter requires that the PV array to be floating with respect to ground per NEC 690.35.
Per NEC 690.35, wires from the PV array must be UL-listed, 1500V minimum rating, 90°C minimum temperature rating.
For the string connections it is necessary to use the DC input quick fit connectors
(17)
located on the left side of the wiring box
(02)
.
Type Manufacturer Model P/N Conductor cross section Ø cable gland
Male Stäubli PV-KBT4-EVO 2
32.0087P0001-UR
32.0089P0001-UR
32.0093P0001-UR
4mm² (11AWG) - 6mm² (9AWG)
4mm² (11AWG) - 6mm² (9AWG)
10mm² (7AWG)
4.7-6.4 mm / 0,18-0.25"
6.4 - 8.4 mm / 0.25-0.33"
6.4 - 8.4 mm / 0.25-0.33"
Female Stäubli PV-KST4-EVO 2
32.0086P0001-UR
32.0088P0001-UR
32.0092P0001-UR
4mm² (11AWG) - 6mm² (9AWG)
4mm² (11AWG) - 6mm² (9AWG)
10mm² (7AWG)
4.7-6.4 mm / 0,18-0.25"
6.4 - 8.4 mm / 0.25-0.33"
6.4 - 8.4 mm / 0.25-0.33"
Using mating parts that are not compliant with the quick fit connector models on the inverter could cause serious
damage to the unit and lead to invalidation of the warranty.
16
17
The input connectors are divided into 12 MPPTs concistsing of 2 pairs of quick fit connectors (17) .
Each DC disconnect switch
(16)
disconnects a group of 3 MPPTs.
• Attach the DC side ground cable(s) to the equipment grounding conductor con-
nection point
(10)
(this is the same thread for handles) using the washers and M8
bolt provided in the wiring box installation kit:
1 = cable lug
2 = flat washer
3 = spring washer
4 = M8 bolt
1 2
3 4
• Torque to 15.2 Nm (11.2ft-lb).
Before connecting the inverter to AC or DC sources use a suitable mul-
timeter to test the conductivity of the earth connections between the
equipment grounding conductor connection point (10) and a handles
thread (04) on the housing of power module (01).
10