McQuay MicroTech II Service Manual

MCQUAY MicroTech II Control
pLAN+Driver
for Modular Chillers
McQuay ALS / WHS / PFS
With screw compressors, 1 to 4 circuits
Release of the Manual: 1.0 - 01/05/2001

Contents
APPLICATIONS AND FUNCTIONS CARRIED OUT BY THE SYSTEM
MASTER/SLAVE SYSTEM ARCHITECTURE
INPUT/OUTPUT LIST
AIR/WATER UNIT WITH MAX. 4 SCREW COMPRESSORS MCQUAY ALS / WHS
WATER/WATER UNIT WITH MAX. 2 SCREW COMPRESSORS, MCQUAY PFS
REGULATION
OUTLET TEMPERATURE REGULATION
CONTINUOUS UNLOADING
Principles of working:
Forced Unloading
START-UP OF A SINGLE COMPRESSOR
Description of the logic :
START OF THE COMPRESSOR MOTOR
Description of the Logic:
LIMITATIONS AT COMPRESSOR START
PUMPDOWN
COMPRESSOR ROTATION
CONDENSATION REGULATION
CONDENSATION CONTROL WITH CUT ENABLING
MicroTech II Reference
Description
ANTIFREEZE REGULATION
ELECTRO-VALVE MANAGEMENT
Working Description
WATER PRESSURE CONTROL FOR PFS UNITS
CONTROL LOGIC OF THE COOLING TOWER FOR PFS
PFS with single compressor
PFS with two Compressors
CONTROL LOGIC OF THE 3-WAY VALVE FOR PFS UNITS
ALARMS
GENERAL DESCRIPTION
ALARM HISTORICAL
ALARM TABLE
DRIVER ALARMS
PLAN NETWORK
I/O card address
Terminal address
TERMINAL MANAGEMENT
Terminal configuration procedure
Display of the terminal connection state
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