Skip to main content
Version: 5.32

Load throw-off management

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.

1. 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
    L 1L 2L 3
    140A90A90A
     needs to be thrown off to not exceed the 3 x 250A limit. In that case the DLM may only consume
    L 1L 2L 3
    100A150A150A
    .

1.1. Configuring the Master Charge Controller​

  1. Apply the following configuration:

Location in Config UIParameterValue
Load Management >
Dynamic Load Management		Dynamic Load Management - DLM Master/Slave DLM Master (With internal DLM-Slave)
EVSE Sub Distribution (L1/L2/L3)[A]
L 1L 2L 3
240240240
External Input 1 Config Enable Opto 1 in
External Input 1 Polarity Active low
External Input 1 Current Offset
L 1L 2L 3
-140-90-90
  1. At the bottom of the Config UI, click , then click to apply the changes

1.2. Configuring the Slave Charge Controller​

  1. Apply the following configuration:

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

2. 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.

2.1. Configuring the Master Charge Controller​

  1. Apply the following configuration:

Location in Config UISet Parameterto
Load Management >
Dynamic Load Management		Dynamic Load Managemen - DLM Master/SlaveDLM Master (With internal DLM-Slave)
EVSE Sub Distribution Limit (L1/L2/L3)[A]
L 1L 2L 3
323232
External Input 1 Config Enable Opto 1 in
External Input 1 Polarity Active low
External Input 1 Current Offset
L 1L 2L 3
-25-25-25
Disconnected Limit [A]7
  1. At the bottom of the Config UI, click , then click to apply the changes

2.2. Configuring the Slave Charge Controller​

  1. Apply the following configuration:

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

3. Limitations of the Load throw-off function​

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