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Version: 5.32

Load throw-off management

What you'll find here

  • What is the Load throw-off function?
  • What can it be used for?
  • What are the Limitations to the Load throw-off function?

Intro

Given the following context:

  • Multiple consumers
  • Some consumers require constant electrical supply
  • Others have a variable need for electrical supply

The load throw-off feature helps manage the electrical supply distribution in that context.
Following are some example scenarios to help introduce the feature in more detail.

Example scenario 1

A factory operates a staff canteen and provides 10 EV chargers for company fleet cars. Both facilities operate with the same contract, encouraging load limits of 3 x 250A. During service hours, the kitchen consumes up to

150A on L1
100A on L2 and
100A on L3.

A signal is provided when the kitchen is not busy, and consumption falls below 10A.

  • The EV charging infrastructure may consume 240A when the kitchen is not busy (=250A – 10A)
  • As soon as the kitchen is not used, the control electronics provides a 12V DC signal and the full 3 x 240A may be used by the DLM system.
  • When the kitchen is in use, the load of 140A ‖ 90A ‖ 90A needs to be thrown off to not exceed the 3 x 250A limit. In that case the DLM may only consume 100A ‖ 150A ‖ 150A.

Configuring the Master Charge Controller

  1. Apply the following configuration:

Location in DashboardParameterValue
Load Management >
Dynamic Load Management
Dynamic Load Managemen - DLM Master/SlaveDLM Master (With internal DLM-Slave)
Load Management >
Dynamic Load Management
EVSE Sub Distribution (L1/L27L3)[A]240240240
Load Management >
Dynamic Load Management
External Input 1 ConfigEnable Opto 1 in
Load Management >
Dynamic Load Management
External Input 1 PolarityActive low
Load Management >
Dynamic Load Management
External Input 1 Current Offset-140-90-90
  1. At the bottom of the window, click , then click to apply the changes

Configuring the Slave Charge Controller

  1. Apply the following configuration:

Location in DashboardParameterValue
Load Management >
Dynamic Load Management
Disconnected Limit [A]10
  1. At the bottom of the window, click , then click to apply the changes

Example scenario 2

A grid operator uses ripple control to throw-off loads. In this example, one (or multiple) 22kW wall-box must reduce load to 3 x 7A (5kW), when a control signal is low.

Configuring the Master Charge Controller

  1. Apply the following configuration:

Location in DashboardSet Parameterto
Load Management >
Dynamic Load Management
Dynamic Load Managemen - DLM Master/SlaveDLM Master (With internal DLM-Slave)
Load Management >
Dynamic Load Management
EVSE Sub Distribution Limit (L1/L27L3)[A]323232
Load Management >
Dynamic Load Management
External Input 1 ConfigEnable Opto 1 in
Load Management >
Dynamic Load Management
External Input 1 PolarityActive low
Load Management >
Dynamic Load Management
External Input 1 Current Offset-25-25-25
Load Management >
Dynamic Load Management
Disconnected Limit [A]7
  1. At the bottom of the window, click , then click to apply the changes

Configuring the Slave Charge Controller

  1. Apply the following configuration:

Location in DashboardParameterValue
Load Management >
Dynamic Load Management
Disconnected Limit [A]7
  1. At the bottom of the window, click , then click to apply the changes

Limitations of the Load throw-off function

  • The load can not be reduced over time but only instantly
  • With DLM, only current can be reduced, not power (reduction 32A 🡒 7A, but not 22kW 🡒 5kW)