# Microgrid generator start-demand allocator

Canonical URL: https://eloragrid.ai/symbols/microgrid-generator-start-demand-allocator
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MGSA
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Power demand and generator availability
Output: Selected start requests

Selects available generating sets to satisfy the defined start demand and priority rules.

## In plain English

### What this block does

Selects available generating sets to satisfy the defined start demand and priority rules.

### A simple example

In a microgrid power station, the controller can request an additional generator when available reserve falls and later unload a selected machine before its documented stop sequence. For this reference, the drawing identifies “Power demand and generator availability” at the input and “Selected start requests” at the output. A start request does not guarantee an available source.

### What the drawings help you do

Start at the named input: Power demand and generator availability. Identify its source device or document and the state represented on the drawing. Follow the named output: Selected start requests. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Power demand and generator availability
- Output: Selected start requests
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Power demand and generator availability → MGSA → Selected start requests
A reading guide. The entry's original illustration and input/output facts describe this application.

- [AGC power management options G4, G5 and G8](https://www.deif.com/media/5a4bx0xv/agc-3-option-g4-g5-and-g8-power-management-4189340696-uk.pdf)


## What it represents

Selects available generating sets to satisfy the defined start demand and priority rules. Generating-set coordination decides which available machines should operate and how their power contribution is shared. Engine starting, breaker connection, load acceptance and stopping are separate stages with their own feedback.
In a microgrid power station, the controller can request an additional generator when available reserve falls and later unload a selected machine before its documented stop sequence. For this reference, the drawing identifies “Power demand and generator availability” at the input and “Selected start requests” at the output. A start request does not guarantee an available source.
Preserve the engine and generator electrical boundaries, command authority and source readiness. Starting duty, minimum loading, synchronising, fuel systems and cooling behavior require the selected generator documentation. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

## How to read it

- Start at the named input: Power demand and generator availability. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Selected start requests. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- A start request does not guarantee an available source.
- Preserve the engine and generator electrical boundaries, command authority and source readiness. Starting duty, minimum loading, synchronising, fuel systems and cooling behavior require the selected generator documentation.

## Information to show or reference

- Label the source and connection reference for power demand and generator availability.
- Identify the destination and defined state of selected start requests.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: A start request does not guarantee an available source.

## Important distinction

A start request does not guarantee an available source. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

## Facts

- Representation: Functional block
- Installation focus: Microgrids
- Input / boundary: Power demand and generator availability
- Output / connection: Selected start requests
- Lookup label: MGSA is a library lookup label, not a standard device designation.

## Public references

- [AGC power management options G4, G5 and G8](https://www.deif.com/media/5a4bx0xv/agc-3-option-g4-g5-and-g8-power-management-4189340696-uk.pdf) — DEIF. Public technical context for microgrid generating-set coordination. Generator start/stop, load sharing, reserve and power management. The application text and educational graphic are independently authored; the publisher does not certify this representation.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.