Potential free contact

Potential-free contact

This terminal is found on the interface board. It enables the following features, which are configurable in the app:

Option 1: Emergency stop

This option allows the charging process to be stopped immediately when the input circuit is opened or closed.

• If charging is in progress and the input state changes to trigger an emergency stop, the session is put ON HOLD.

• If the charger is idle and the input state changes to trigger an emergency stop, a new session can be started but will immediately be put ON HOLD.

• The ON HOLD status is visible in the app when the charger is in this state.

• When an emergency stop is active, the blue LEDs will light up in sequence from top to bottom.

• The charger will immediately stop charging.

Option 2: Block or allow charging

This option allows charging to be blocked or allowed when the input circuit is opened or closed.

• If charging is in progress and the input state changes to block charging, the session will be put ON HOLD.

• If the charger is idle and the input state changes to block charging, a new session can be started but will immediately be put ON HOLD.

• The ON HOLD status is visible in the app when the charger is in this state.

• When charging is blocked, the blue LEDs will light up in sequence from top to bottom.

• The charger will wait 2 seconds to check for false positive signals before stopping or restarting the charge.

Option 3: Reduce charging rate

This option reduces the charging rate when the input circuit is opened or closed.

• If power reduction mode is selected, the user can configure the new, lower charging rate (from 6 A to the maximum allowed by the charger).

• The charger will wait 2 seconds to check for false positive signals.

• If power is reduced by the potential-free contact, the LED light sequence will not change.

• The user can see the cause of the power reduction in the app's diagnostic screen.

• If the rotary switch is set to a value lower than the one configured in the app, the charging amperage will decrease to match the switch's setting. If the switch is set to a higher value, the amperage will remain at the app-defined limit. If the rotary switch is in an invalid position, the amperage will default to 6 A.

By default this setting must be set to allow charging when circuit is open (Option 2).

Potential-free contact can work with or without DLM/SOLAR/OCPP integration.

If charging was blocked by potential-free contact and later unblocked, charger will apply randomized delay before starting charging (if it's enabled)

If charging was blocked by either Option 1 or Option 2 and later unblocked, or its charging power was reduced by Option 3 but was allowed to return to normal rate - charger will start charging from lowest possible power and later ramp up gradually (at a rate of 10% of the rated power per minute).

Charger is able to send information to OCPP server informing it why charging is not allowed or why power is decreased.

Potential-free contact examples