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LORENTZ S

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Checking the voltage of the pump system

To protect your LORENTZ S1 controller from damage, it’s essential to ensure that the total open-circuit voltage (Voc) of your PV array does not exceed the maximum allowed. This value depends on the specific controller model.

Use the table below to confirm the maximum permissible Voc for your system. Always check this before installation, and whenever changing or adding PV modules.

Important: Exceeding the maximum input voltage can result in permanent damage to the controller. Always calculate the total Voc of your PV array based on the module specifications and the number of panels connected in serie.

Maximum Voltage Limits (Voc)

Model	S1-200	S1-700
Maximum Open-Circuit Voltage (Voc)	55 V DC	220 V DC

Troubleshooting

WARNING - Disconnect power from the controller before performing any installation, inspection, maintenance or cleaning activities on the motor or pump.

Event in the app	Behavior of the LEDs in the controller	What is happening?	How do I troubleshoot the event?	What happens next?
Input voltage is too high Message in the app: "Check the voltage limit on the controller and compare to solar module output"	No light	Light on	The controller has stopped the pump because it has detected that the input voltage is too high.	Check that the total output voltage (Voc) of the connected PV modules does not exceed the maximum input voltage allowed by the controller: For S1-200, the limit is 55 V For S1-700, the limit is 220 V If the voltage is too high, you will need to reconfigure the PV array (e.g., reduce the number of panels in series) to ensure the output voltage stays within the acceptable range. See the corresponding articles at the bottom of the page.	If the overvoltage condition persists, the controller may be permanently damaged. If this happens, the controller must be replaced. Please contact your distributor.

Event in the app

Behavior of the LEDs in the controller

What is happening?

How do I troubleshoot the event?

What happens next?

LED Green

LED Red

Input voltage is too high

Message in the app:
"Check the voltage limit on the controller and compare to solar module output"

No light

Light on

The controller has stopped the pump because it has detected that the input voltage is too high.

Check that the total output voltage (Voc) of the connected PV modules does not exceed the maximum input voltage allowed by the controller:
- For S1-200, the limit is 55 V
- For S1-700, the limit is 220 V
If the voltage is too high, you will need to reconfigure the PV array (e.g., reduce the number of panels in series) to ensure the output voltage stays within the acceptable range. See the corresponding articles at the bottom of the page.

If the overvoltage condition persists, the controller may be permanently damaged. If this happens, the controller must be replaced. Please contact your distributor.

Important information about correct connection can be found here: