19
Signal Block Diagram
The following block diagram illustrates the interrelationship
of the interprocessor communications (IPC) link. These
connections allow the individual microprocessors to
communicate. All standard control modules are mounted
in the chiller control panel with the exception of the burner
module, which is mounted in the burner control panel. The
option modules (shaded box) are present only when
specified. The Tracer, printer, and remote CLD are optional
components that provide communications outside of the
unit control panel. The remote CLD is the only
communication device that is installed outside of the
machine control panels.
pumps are electrically controlled and interlocked to the unit
control panel. This interlocking arrangement provides
protection from improper system water pump control or
loss of flow conditions, which can damage the machine.
This module communicates with the stepper module to
control machine energy input, the starter module to start or
stop solution pumps, control solution flow, and the
operator interface to display operation status information to
the operator.
Setpoint Communication and Storage
The machine setup information selected at the operator
interface is stored in the chiller module memory. This
module contains non-volatile memory that is retained when
the panel is not powered. The
Note: The Tracer and Printer are not expected to exist
together in an installation.
The Chiller Module (1U3) serves as the master control for
the unit. It is responsible for implementing the Leaving
Water Temperature control algorithms that control chiller
capacity. The chiller module manages machine safety,
operating limits, and chilled water temperature by
monitoring unit-mounted sensors and information from
other modules on the interprocessor communications (IPC)
link.
When machine-operating conditions change, the chiller
module initiates communications to the other panel
modules to manage that change. The input or output ports
on the chiller module monitor and/or control-chilled water
and cooling water pump operation. The evaporator and
condenser water
module is responsible for verifying that the setup
memory is not corrupted, and for substituting default
settings if the stored settings become corrupted.
1U1 Starter Module
The starter module controls pump operation and provide
an interface to the adjustable frequency variable speed
drives for lithium bromide solution flow control.
1U2- Circuit Module (standard)
The circuit module is located in the lower portion of the
control panel beneath the Chiller module. The main
purpose of the circuit module is to control and manage the
Lithium Bromide. The circuit module is responsible for
implementing the concentration control algorithm. Also,
the circuit module collects input data from unit temperature
and pressure sensors, and switch inputs, and makes this
information
Burner
Panel
Options
Module
(Optional)
IPC
Remote CLD
(Optional)
IPCB
(Optional)
Tracer
(Optional)
TCI IV
(Optional)
Comm 4
Comm 3
To Other UCMs
ICS Proprietory
Unit Proprietory
To Other Tracer
or Other BAS
Printer
(Optional)
Printer Interface
Module (Optional)
Burner
Module
Unit Control Panel with Modules Burner
Purge Module
ABDA Only
Local CLD
Chiller
Module
Circuit
Module
Stepper
Module
Starter
Module
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