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OPERATING INSTRUCTIONS

MILLENNIUM

VARIABLE SPEED DRIVE

Supersedes: 160.00-O1 (702)

Form 160.00-O1 (1020)

This Instruction is to be used in conjunction with the standard

Operating Instructions for YORK Model YT & YK chillers

furnished with an optional Variable Speed Drive (VSD).

TABLE OF CONTENTS

VSD Style Variations .......................................................................................... 2
VSD Unit and Harmonic Filter Component Overview ......................................... 2
VSD Control System Overview........................................................................... 7
Control Panel VSD Related Keypad Functions ................................................ 10
VSD Adaptive Capacity Control ........................................................................ 12
VSD Display Messages .................................................................................... 13

YORK MODEL YK CHILLER WITH OPTIONAL VARIABLE SPEED DRIVE

VSD SIZE (HP)

60 HZ

50 HZ

351

292

503

419

790

658

1100

900

1
2
3
...
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Содержание MILLENIUM 1100-46D

Страница 1: ...YT YK chillers furnished with an optional Variable Speed Drive VSD TABLE OF CONTENTS VSD Style Variations 2 VSD Unit and Harmonic Filter Component Overview 2 VSD Control System Overview 7 Control Panel VSD Related Keypad Functions 10 VSD Adaptive Capacity Control 12 VSD Display Messages 13 YORK MODEL YK CHILLER WITH OPTIONAL VARIABLE SPEED DRIVE VSD SIZE HP 60 HZ 50 HZ 351 292 503 419 790 658 1100...

Страница 2: ...ocument and any referenced materials This in dividual shall also be familiar with and comply with all applicable industry and governmental standards and regulations pertaining to the task in question SAFETY SYMBOLS The following symbols are used in this document to alert the reader to specific situations Indicates a possible hazardous situation which will result in death or serious injury if prope...

Страница 3: ...g any work on the chiller REVISION NOTES Revisions made to this document are indicated in the following table These revisions are to technical information and any other changes in spelling grammar or formatting are not included AFFECTED PAGES DESCRIPTION 3 Conditioned Based Maintenance program information added CONDITIONED BASED MAINTENANCE Traditional chiller maintenance is based upon assumed and...

Страница 4: ...ter section a three phase DC to AC inverter section and an output suppression network The AC to DC rectifier utilizes a semi converter formed by the connection of three SCR diode modules 1SCR 3SCR in a three phase bridge configuration See Fig 1 The modules are mounted on a liquid cooled heatsink Use of the semi converter configura tion permits implementation of a separate pre charge circuit to lim...

Страница 5: ...FORM 160 00 O1 1020 JOHNSON CONTROLS 5 THIS PAGE INTENTIONALLY LEFT BLANK ...

Страница 6: ...JOHNSON CONTROLS 6 FORM 160 00 O1 1020 ...

Страница 7: ...FORM 160 00 O1 1020 JOHNSON CONTROLS 7 ...

Страница 8: ...tsink temperature is also monitored using thermistor temperature sensor RT4 The Bus Isolator board 031 01624 utilizes three resistors on the board to provide a safe impedance between the DC link filter capac itors located on the output phase bank assemblies and the VSD logic board It provides the means to sense the positive midpoint and negative connection points of the VSD s DC link A Current Tra...

Страница 9: ...FORM 160 00 O1 1020 JOHNSON CONTROLS 9 FIG 3A VSD INPUT CURRENT WITHOUT FILTER FIG 3B VSD INPUT CURRENT WITH FILTER LD02727 LD02726 ...

Страница 10: ... capacitors located on the phase bank assembly and the Filter logic board It provides the means to sense the positive midpoint and negative connection points of the filter s DC link VSD CONTROL SYSTEM OVERVIEW The VSD control system is composed of various com ponents located within both the Microcomputer Control Center and the VSD thus integrating the Control Center with the VSD Drive The VSD syst...

Страница 11: ...FORM 160 00 O1 1020 JOHNSON CONTROLS 11 THIS PAGE INTENTIONALLY LEFT BLANK ...

Страница 12: ...JOHNSON CONTROLS 12 FORM 160 00 O1 1020 FIG 4 IEEE 519 FILTER OPTION ...

Страница 13: ...FORM 160 00 O1 1020 JOHNSON CONTROLS 13 LD02725 ...

Страница 14: ...of the VSD s cooling fans and pumps control of the pre charge contactor control of the semi converter gating and generation of the PWM firing pulses which are sent to the VSD gate driver and ultimately gate the IGBT s on and off The VSD Logic board also gathers data from the Cur rent Transformers which monitor the three phases of motor current the heatsink temperatures the internal ambient tempera...

Страница 15: ...rtz When the Filter is present these additional lines are available by scrolling INPUT KVA ___ TOTAL PWR FACTOR ____ INPUT V AB ___V BC ___V CA ___V INPUT CURR A ___A B ___A C ___A INPUT V THD A ___ B ___ C ___ INPUT CURR TDD A ___ B ___ C ___ Display Data Key This key functions as normal but offers two additional lines of display with VSD opera tion After scrolling through the normal displays the...

Страница 16: ...n the vanes hit 100 If there is an increase in load while at this point the ACC will increase speed until the vanes are at 95 The ACC will then be allowed to continue to optimize the speed and vanes Surge is Detected If in the process of dropping speed and opening vanes the compressor should surge theACC will boost the speed back up enough to get the chiller out of surge and will store in memory t...

Страница 17: ...r cur rent exceeds a given limit The motor current is sensed by the Current Transformers on the VSD output pole assemblies and the signals are sent to the VSD logic board for processing Maximum instantaneous permis sible currents are 351 292 HP 771 Amps 503 419 HP 1200 Amps 790 658 HP 1890 Amps 1100 900 HP 3093 Amps If an overcurrent trip occurs but the chiller restarts and runs without a problem ...

Страница 18: ...capacitors are wired in series to achieve a 900 VDC capability for the DC link It is important that the voltage be shared equally from the junction of the center or series capacitor con nection to the negative bus and to the positive bus This center point should be approximately of the total DC link voltage Most actual bus voltage imbalance conditions are caused by a shorted capacitor or a leaky o...

Страница 19: ...e two microprocessors on the VSD logic board Message RUN RELAY FAULT Redundant run signals are generated by the Micropanel one via wire 24 and the second via the serial communica tions link Upon receipt of either of the two run commands by the VSD logic board a 5 second timer shall commence timing If the missing run command is not asserted within the 5 second window the unit will shut down and the...

Страница 20: ... particular shutdown and its accompany ing message is generated if the filter s DC link voltage drops to a level less than 60 VDC below the filter DC link voltage setpoint The filter DC link voltage setpoint is determined by the filter logic board via the sensing of the three phase input line to line voltage This setpoint is set to the peak of the sensed input line to line voltage plus 32 volts no...

Страница 21: ...TDD level of 8 or less for the VSD system Astandard VSD less the optional filter typically has an input current TDD level on the order of 28 30 Message WARNING FILTER DATA LOSS This message is displayed if the communications link between the VSD logic board and the filter logic board or the communications link between the filter logic board and the ACC board is interrupted This message can also oc...

Страница 22: ...sage was intended as a check of the 519 logic board s internal triangle waveform generator However the accuracy of the measuring circuit on the board can have as much error as the generator it is trying to mea sure resulting in nuisance shutdowns If this message occurs repeatedly it can be corrected by installing a special EPROM Message FLTR SERIAL RECEIVE FAULT is a message which would occur on s...

Страница 23: ...FORM 160 00 O1 1020 JOHNSON CONTROLS 23 NOTES ...

Страница 24: ...Pennsylvania USA 17349 1 800 524 1330 Subject to change without notice Printed in USA Copyright by Johnson Controls 2020 www johnsoncontrols com ALL RIGHTS RESERVED Form 160 00 O1 1020 Issue Date October 23 2020 Supersedes 160 00 O1 702 ...

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