Generator & Alternator Education Resources | CrestGen Power Solutions

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Understand Your
Equipment Better

Facilities managers and engineers who understand how their alternators work make better decisions — about maintenance schedules, part replacements, and when to call for service.

Below is a curated library of Application Guidance Notes (AGNs) — technical reference documents published by Stamford / AvK, the manufacturer of the alternator systems we service most. We've organized the most useful guides for commercial facility operators by topic.

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If you have a specific question about your alternator, AVR, or generator system that isn't covered here, reach out — our team is happy to point you to the right resource or walk you through it directly.

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Maintenance & Service AVR & Excitation Operation & Parallel Running Troubleshooting & Protection Installation & Setup Technical Reference

For Facilities Teams

Maintenance & Service

Practical guidance for keeping your alternator running reliably — the topics most relevant to planned maintenance programs.

Service and Maintenance

Core maintenance practices to maximize alternator lifespan and reliability.

Customer Training

Overview of training resources available for operators and maintenance staff.

Expected service life of alternator bearings and factors that affect it.

Alternator Bearings

Detailed guidance on bearing types, lubrication, and replacement intervals.

Alternator Life Expectancy

What determines how long an alternator lasts, and how to extend it.

Anti-Condensation Heaters

Why standby units need heaters, and how they prevent moisture damage.

Alternator Storage

Best practices for storing alternators or spare units long-term.

Air Inlet Filters

Filter selection and maintenance to protect alternator cooling systems.

Our Specialty

AVR & Excitation Systems

The heart of voltage regulation — these guides cover how AVRs work, how to select the right one, and how excitation systems are designed.

How to choose the correct AVR module for your alternator and application.

Breakdown of the features and settings found on modern AVR modules.

Excitation System

How alternator excitation systems are designed and how they operate.

AVR Power Supplies

How AVR modules are powered and what can go wrong with supply circuits.

Residual Voltage and Residual Magnetism

Why alternators sometimes fail to build voltage, and how to fix it.

Fault Currents and Short Circuit Decrement Curves

How alternators respond to short circuits and fault conditions.

For Multi-Unit Sites

Operation & Parallel Running

For facilities running multiple generators in parallel, or connected to the utility grid — covers load sharing, synchronization, and operating conditions.

Conditions for Parallel Operation

Requirements for safely running multiple alternators together.

Alternators for Parallel Operation

Design considerations for alternators intended for parallel use.

Load Sharing with Quadrature Droop

How droop CTs and reactive load sharing keep parallel units balanced.

Alternator Operating Voltages

Standard voltage configurations and reconnection options.

Alternator Operating Speed

How engine speed and alternator frequency relate to each other.

Alternator Reactance

Understanding reactance values and their effect on performance.

Alternator Ratings and Overload

How ratings are determined and what happens during overload conditions.

Operating Charts

Reading and interpreting alternator operating charts and curves.

Diagnose With Confidence

Troubleshooting & Protection

Understand common fault conditions, power quality issues, and the protection systems designed to handle them.

Overload and Fault Protection

Protection schemes that guard against overload and fault conditions.

Unbalanced Loads

Effects of unbalanced loading and how alternators tolerate it.

Negative Phase Sequence Currents

What causes these currents and how they affect rotor heating.

Non Linear Loads

How modern electronic loads (UPS, VFDs, IT equipment) affect alternators.

Harmonic Voltage Distortion

Sources of harmonic distortion and how to mitigate them — critical for data centers.

Regenerative Loads and Reverse Power

Understanding reverse power conditions and protective relay settings.

Pole Slipping and Reverse Power

Causes and consequences of pole slipping in synchronous alternators.

Shaft Bearing Currents

How induced shaft currents can damage bearings, and how to prevent it.

For New Installations

Installation & Setup

Reference material for commissioning new generator sets — mounting, alignment, vibration, and terminal arrangements.

Terminal Arrangements

Standard terminal box layouts and connection configurations.

Proper earthing/grounding practices for alternator installations.

Generating Set Assembly — Coupling Arrangements

How alternators couple to engines, and common coupling types.

Generating Set Assembly — Mounting Arrangements

Mounting configurations for generator set assemblies.

Generating Set Assembly — Alignment

Alignment tolerances and procedures during assembly.

Acceptable vibration levels and causes of excessive vibration.

Generating Set Assembly — Torsional Vibration Analysis

How torsional vibration is analyzed for new generator set designs.

Winding and Bearing Temperature Sensors

Sensor types used for monitoring winding and bearing temperatures.

Deep Dive

Technical Reference

Standards, environmental conditions, and broader engineering topics for those who want to go further.

Codes, Standards and Directives

Overview of the international codes and standards alternators are designed to.

Standard factory and field testing procedures for alternators.

Testing Winding Insulation Systems

Insulation resistance and polarization index testing methods.

Environmental Conditions

How temperature, altitude, and humidity affect alternator ratings.

Environmental Rating Factors

Derating factors for non-standard operating environments.

Electromagnetic Compatibility (EMC)

EMC requirements and how AVRs are designed to meet them.

Air Flow and Cooling

Cooling requirements and airflow design for alternator enclosures.

Alternator IP Protection

IP rating system explained and how it applies to alternator enclosures.

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All Application Guidance Notes are published by Stamford / AvK (Cummins Generator Technologies) and are provided here as a free reference for our customers. CrestGen Power Solutions is an independent parts and service provider and is not affiliated with or endorsed by Cummins Inc. or Stamford / AvK. For the complete and most current library of guidance notes, visit the official Stamford / AvK downloads page.

Have a Question About
Your Specific Setup?

Our team can walk you through any of these topics as they apply to your equipment.

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