# Station charger AC-failure indication

Canonical URL: https://eloragrid.ai/symbols/station-charger-ac-failure-indication
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: SCAI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: substations
Input: Charger AC input health
Output: Charger AC-failure alarm

Reports loss of the assigned charger input supply while distinguishing the available battery path.

## In plain English

### What this block does

Reports loss of the assigned charger input supply while distinguishing the available battery path.

### A simple example

In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “Charger AC input health” at the input and “Charger AC-failure alarm” at the output. Battery support may remain available.

### What the drawings help you do

Start at the named input: Charger AC input health. Identify its source device or document and the state represented on the drawing. Follow the named output: Charger AC-failure alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Charger AC input health
- Output: Charger AC-failure alarm
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Charger AC input health → SCAI → Charger AC-failure alarm
A reading guide. The entry's original illustration and input/output facts describe this application.

- [MicroGenius S2/S4 battery charger technical manual](https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf)


## What it represents

Reports loss of the assigned charger input supply while distinguishing the available battery path. A station battery system supplies protection, control and other assigned DC loads through a documented charger and distribution arrangement. Charger output, battery contribution and load distribution are related but separately monitored paths.
In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “Charger AC input health” at the input and “Charger AC-failure alarm” at the output. Battery support may remain available.
Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy. 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: Charger AC input health. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Charger AC-failure alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Battery support may remain available.
- Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy.

## Information to show or reference

- Label the source and connection reference for charger ac input health.
- Identify the destination and defined state of charger ac-failure alarm.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Battery support may remain available.

## Important distinction

Battery support may remain available. 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: Substations
- Input / boundary: Charger AC input health
- Output / connection: Charger AC-failure alarm
- Lookup label: SCAI is a library lookup label, not a standard device designation.

## Public references

- [MicroGenius S2/S4 battery charger technical manual](https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf) — SENS. Public technical context for station battery and charger distribution. Battery charging modes, DC distribution interfaces and charger alarms. 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.