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Symbols used to alert readers to specific situations.
Information is subject to change; users must verify applicability.
Details revisions made to the document.
Lists related manuals and their form numbers for reference.
Data-driven maintenance program for optimal operation and lifecycle assurance.
Explains the nomenclature and part number breakdown for VSD models.
Lists VSD part numbers and their corresponding descriptions.
Explains the nomenclature and part number breakdown for LVD models.
Lists OptiSpeed LVD part numbers and their descriptions.
Overview of OptiSpeed drive and harmonic filter components and operation.
Details the optional harmonic filter, its purpose, and components.
Compares G and W designs, focusing on cooling system variations.
Compares VSD and LVD drives regarding harmonic filter integration.
Overview of OSCD control system connection to Microcomputer or OptiView Control Center.
Details Microboard and ACC board functions in older control systems.
Describes control system changes including new components and ports.
Explains interconnection and function of OSCD and Harmonic Filter logic boards.
Refers to keypad functions and display changes for VSD models.
Describes YORK OSCD's adaptive speed reduction and surge avoidance.
Conditions for speed reduction based on leaving chilled liquid temperature.
Conditions for speed reduction requiring stable temperature.
Describes operation when vanes are fully open and load increases.
Explains surge detection and storage of surge points.
Discusses reasons for speed reduction failure, including instability.
Adjustment for temperature instability; consult YORK Service.
Increases drive speed for surge points; rarely used.
Illustrates the VSD 351 system architecture without harmonic filter.
Image and location of the VSD logic board on the panel door.
Image of the SCR trigger board.
Image of the optional harmonic filter logic board on the panel door.
Image of the gate driver board and power module.
Explains the organization and event sequence of safety shutdowns.
Details VSD shutdown messages, causes, and reset procedures.
Explains the organization and event sequence of cycling shutdowns.
Details VSD cycling shutdown messages, causes, and procedures.
Indicates affected OSCD/filter operation, but functionality remains.
Details harmonic filter warning messages and their implications.
Answers common questions about OSCD operation, such as input amps and anti-recycle.
Provides conversion factors for English to SI units for various measurements.
General
