Proper Commissioning of VEICHI Solar Drives with External Switching (Cam Switch)
Proper Commissioning of VEICHI Solar Drives with External Switching (Cam Switch)
Solar drives used in solar-powered irrigation systems are responsible not only for energy management but also for system control. One of the most common control methods used in field applications is external switching.
In this episode of the System Solar Power Energy Systems technical content series, our Technical Office Engineer, Kübra Aslan, explains step by step how to connect and commission external switching devices such as cam switches and relays on VEICHI SI23 and SI21 solar drives.
What Are the X1 and COM Terminals Used For?
VEICHI solar drives include X1 and COM terminals within the control terminal block.
By factory default, the X1 terminal is assigned as the digital input for the Forward Run command.
The COM terminal serves as the common reference terminal and acts as a key interface for communication between external control devices and the drive.
These terminals enable applications such as:
* Cam switch control
* External relay control
* Remote start-stop commands
* External operating controls
Why Are Parameter Settings Required?
Making the physical wiring connection alone is not sufficient. To activate external switching functions, the corresponding drive parameters must also be configured correctly.
After completing the wiring, the relevant input function must be enabled through the drive parameter menu.
External Switching Configuration on SI23 Models
In VEICHI SI23 solar drives, parameter F00.02 is used to activate the external switching function.
After accessing parameter F00.02, the value should be set to 1 and saved.
Once this setting is completed, the switching connection between X1 and COM becomes active and ready for operation.
External Switching Configuration on SI21 Models
In VEICHI SI21 solar drives, external switching is enabled through parameter F01.01.
After configuring this parameter, the drive can respond to commands received from the external switching circuit.
GND Terminal Usage on SI21 Models
On certain SI21 models rated up to 5.5 kW, a COM terminal is not available.
In these models, the GND terminal is used as the common connection point instead of COM.
When connecting a cam switch or external relay, this difference must be considered to ensure proper system operation.
Conclusion
External switching applications provide greater flexibility and simplify system control in field installations.
However, proper parameter configuration is just as important as correct wiring. Accurate use of X1, COM, and GND terminals, together with the appropriate parameter settings, ensures safe, reliable, and efficient system operation.
At System Solar Power, we continue to provide not only products but also accurate technical knowledge and sustainable energy solutions for our business partners.
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