Led Indicator Panel; Circuit Diagram - CanadianSolar CSI-75K-T40001-E User Manual

2 Product Introduction

2.2.2 LED Indicator Panel

As an HMI, the LED indicator panel on the front of the inverter can indicate the present working state of the inverter.
LED indicator
PV connection indicator
Grid connection indicator
Communications/Maintenance
indicator
Alarm indicator
Turn the DC switches to the ON position before restarting the inverter.

2.3 Circuit Diagram

The MPPT is utilized for DC input to ensure the maximum power from the PV array at different PV input conditions.
The inversion circuit converts the DC power into AC power and feeds the AC power into the utility grid through the AC
terminal. The protection circuit is equipped to ensure the safe operation of the device and personal safety.
The following figure shows the main circuit of the inverter.
+
DC1
-
+
DC9
-
DC
DC SPD
Current
Switch
Monitoring
LED state
Steady green
Off
Steady green
Blinking green
Off
Blinking green
Off
Steady green
Steady red
Blinking red
Off
MPPT1
（Boost1）
DC EMI
Filter
MPPT9
（Boost9）
DC BUS
FIG 2-4 Product topological diagram
Definition
At least one PV string is properly connected, and the
DC input voltage of the corresponding MPPT circuit is
at least 200V.
The solar inverter disconnects from all PV strings, or
the DC input voltage of all MPPT circuits is less than
200V.
The solar inverter is in grid-tied mode.
The solar inverter is in self-test mode or wait mode.
The solar inverter is not in grid-tied mode.
The solar inverter receives communication data
normally
The solar inverter has not receives communication data
for 10 seconds.
The solar inverter is in maintenance status
A major alarm is generated.
A minor or warning alarm is generated.
No alarm
AC Filter
Inverter Circuit
(DC/AC)
AC EMI
Filter
AC SPD
AC Relays
L1
L2
L3
N
PE
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