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Figure 7. Danfoss MCX primary controller
Figure 8. Schneider 7-inch HMI Touchscreen
Operating the Microprocessor
The touchscreen interface panel is ready to use when it is
connected to the Ethernet switch and chiller powered is
ON.
Microprocessor Functions
For practical purposes, all essential control information and
operator actions are read and responded to using the
touchscreen interface panel. The touchscreen interface
panel is connected to the primary and companion
controllers.
NOTICE
Component Damage!
Failure to follow instructions could damage sensitive
electronic components beyond repair.
To prevent arcing or surges of electrical current, do
not use wires or cables to jump components or
bypass the manufacturer's safety systems.
Operator Control
A touchscreen interface panel is the primary means for the
operator or maintainer to monitor and modify a host of
functions involving temperatures, pressures, set points
alarms, elapsed operating hours, etc.
The touchscreen interface is connected to and
communicates with all module controllers via the Ethernet
and RS485 switch. It accesses overall chiller functions and
settings as well as individual module settings.
Touchscreen Interface Tutorial
This section consists of a tutorial that first-time personnel
can use to navigate through the various functions and
features that are available in the interface.
Control System
This document section provides user details for the user
interface of the Thermafit™ Modular TACW Chiller. The
following is a typical About screen that provides you exact
HMI software version and HMI Runtime version or firmware
version.
Figure 9. Revision Screen
This HMI software is designed to meet the needs of all
chillers with 1-6 compressors and in either air-cooled or
water-cooled configurations. In addition, this software
provides visibility into external special controls and optional
functionalities.
Control Architecture
The control architecture is broken down in the following
categories:
• Basic Controls – considers both standard water-cooled
and air-cooled chillers
– Menus
– Data Displays
• Special Functions:
– Hand/Off/Auto
– Chiller Setpoint Control
– Enhanced EXV Control
– Condenser/Fan/Cooling Tower Control/Bypass
Valve
– Tonnage and Power Calculations
Operating Procedures
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