# Yard motor-drive supply-failure input

Canonical URL: https://eloragrid.ai/symbols/yard-motor-drive-supply-failure-input
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: YMSI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchyards
Input: Motor-drive supply supervision
Output: Drive supply alarm

Reports loss of the electrical supply serving the assigned primary-device motor operator.

## In plain English

### What this block does

Reports loss of the electrical supply serving the assigned primary-device motor operator.

### A simple example

In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Motor-drive supply supervision” at the input and “Drive supply alarm” at the output. Manual operating capability is equipment-specific.

### What the drawings help you do

Start at the named input: Motor-drive supply supervision. Identify its source device or document and the state represented on the drawing. Follow the named output: Drive supply alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Motor-drive supply supervision
- Output: Drive supply alarm
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Motor-drive supply supervision → YMSI → Drive supply alarm
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm)


## What it represents

Reports loss of the electrical supply serving the assigned primary-device motor operator. Yard equipment supervision carries the condition and support-system information of primary equipment into station alarms. A monitor's declared alarm, measurement and self-fault output need separate point names.
In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Motor-drive supply supervision” at the input and “Drive supply alarm” at the output. Manual operating capability is equipment-specific.
Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life. 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: Motor-drive supply supervision. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Drive supply alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Manual operating capability is equipment-specific.
- Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life.

## Information to show or reference

- Label the source and connection reference for motor-drive supply supervision.
- Identify the destination and defined state of drive supply alarm.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Manual operating capability is equipment-specific.

## Important distinction

Manual operating capability is equipment-specific. 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: Switchyards
- Input / boundary: Motor-drive supply supervision
- Output / connection: Drive supply alarm
- Lookup label: YMSI is a library lookup label, not a standard device designation.

## Public references

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm) — Hitachi Energy. Public technical context for switchyard equipment condition interfaces. Gas, operating mechanism and circuit-breaker condition monitoring. 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.