Pv Input Configuration; Dc Input Terminals Configuration - CanadianSolar CSI-75K-T40001-E User Manual

5 Electrical Connection
When the solar inverter operates in grid-tied mode,
• do not perform maintenance or operations on the DC circuit, such as connecting or
disconnecting a PV string or a PV module in the PV string. Failing to do so may cause
electric shocks or arcing, which may also cause fire.
Make sure the PV array is well insulated to ground before connecting it to the inverter.
During the installation of PV strings and the solar inverter, the positive or negative
terminals of PV strings may be short-sircuited to ground if the power cable is not proprely
CAUTION
installed or routed. In this case, an AC or DC short circuit may occur and damage the
solar inverter. The caused device is not covered under any warranty.
There is a risk of inverter damage! The following requirements should be met.
Failure to do so will void guarantee and warranty claims.
• Make sure the maximum voltage of each string is always less than 1100 V.
• The inverter enters the standby state when the input voltage ranges between 1,000V and 1,10
0V. The inverter returns to the running state once the voltage returns to the MPPT
operating voltage range, namely, 200 to 1,000V.
NOTICE
Make sure the maximum short circuit current on the DC side is within the permissible
range.
• The polarities of electric connections are correct on the DC input side. The positive and
negative terminals of a PV module connect to corresponding positive and negative DC
input terminals of the solar inverter.

5.8.1 PV Input Configuration

1) The inverter is provided with multiple PV inputs: PV inputs 1~n; and each PV input is designed with an MPP tracker.
Each PV input operates independently and has its own MPPT. In this way, string structures of each PV input may differ
from each other, including PV module type, number of PV modules in each string, angle of tilt, and installation orientation.
2) Each PV input includes two DC input strings.
The two input PV strings should be the same in PV string structure, including the type, number, tilt, and orientation of
the PV modules.
3) The solar inverter does not support full parallel connection for PV strings (full parallel connection: PV strings connect
to one another in parallel outside the solar inverter and then connect to the solar inverter separately).
Use the connectors delivered with the solar inverter. If the PV connnectors are lost or damaged,
purchase the connectors of the same model. The device damage caused by incompativle PV
CAUTION
connecotrs is beyond the warranty scope.

5.8.2 DC input Terminals Configuration

When the DC input is not fully configured, the DC input terminals must meet the following requirements:
1. Evenly distribute the DC input power cables on the DC input terminals controlled by the three DC switches.
DC SWITCH 1 is preferred.
2. Maximize the number of connected MPPT circuits.
When the DC input is not fully configured, recommend the connection as follows
Table 5-1，For inverter model types, CSI-75K-T4001-E，CSI-100K-T4001A-E , CSI-110K-T4001A-E，CSI-120K-T4001A-E
PV Input string No.
1 PV-1
2 PV-1
3 PV-1
4 PV-1
5 PV-1
DC input terminal positions of the inverter
DC switch-1
x x x x
x x x x
x x x PV-5
x x x PV-5
x PV-3 x PV-5
x x x
x PV-7 x
x PV-7 x
x PV-7 x
x PV-7 x
DC switch-2
x x x
x x
x x x
x x PV-11
x x PV-11
x
x
x
x
x
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