The Gateway features an integrated Modbus TCP Server, enabling dynamic control of the maximum cluster current during runtime.
How to enable the Modbus TCP Service:
For security reasons, the Modbus TCP service is disabled by default. To enable this service, please contact us via support@flexecharge.com. We will activate it for you.
How to use the Modbus Dynamic Cluster Limit Register:
The dynamic cluster limit register is an unsigned 16-bit register that can be modified using Modbus Function Code 6 (Write Single Holding Register).
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Unit ID: 255
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Register Address: 0x0
How to set the Dynamic Maximum Cluster Limit:
The load management engine operates with two cluster limits:
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Configured Maximum Cluster Limit (Hard Limit)
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This is a static limit set during system configuration.
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The load management engine will never exceed this limit.
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Represents the maximum current rating of the electrical supply infrastructure.
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Must be configured via HARMON-E as outlined in the configuration guide.
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Dynamic Cluster Limit
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This can be modified in real-time via the Modbus TCP register.
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If the dynamic cluster limit is set higher than the configured maximum cluster limit, the system will default to the hard limit and will never exceed it.
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Load Management Engine Behavior
In specific scenarios, the load management engine may automatically adjust or override the dynamic cluster limit. For example:
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If Unbalanced Load Prevention is active, the engine may reduce the limit to maintain phase balance. If a higher limit is later set via Modbus, the system will respect the lower limit enforced by the engine.
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Once the phase imbalance is resolved, the system will revert to the last Modbus-set cluster limit.
Suspending Charging via Modbus
Setting the dynamic cluster current to 0 A will suspend all charging, ensuring that no charge current is allocated.
For further details, refer to HARMON-E configuration guide or contact our technical support via support@flexecharge.com
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