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Operating Procedures
Modules Overview Screens
Each module controlled by the microprocessor controller
has its own module screen within which the operator can
monitor and maintain conditions affecting that module.
Primary module access is made through the system
control screen containing multiple controls and indicators:
Table 5.
The overview screens
Master Overview 1 Screen
Module Indicators
The overview screen for each module contains a wealth of
controls and indicators specific to that module:
Module En/Dis
Press this button to enable or disable the module. If the
module is disabled, it is excluded from the master
controller compressor sequence.
Module Status
Possible states indicating the module's status include:
•
Module ON - The module is ready to run
•
OFF by Schedule - The module operates according to
predefined schedule and is currently off as scheduled
•
OFF by Digital Input - The module is turned off by the
opened state of microprocessor controller DI1
•
OFF by Keypad - The module is turned off by module
EN/DIS button
•
OFF by Alarm - The module is locked out by one of the
major alarms.
•
OFF by Master - The module is switching between
control states master, slave, and stand-alone
•
OFF by System - The module is turned off by one of
the system off conditions.
•
Man Mode - The module is in manual mode
36
On the home screen, pressing the M1 button displays the
Module #1 (master module) overview 1 screen.
Use the left and right scrolling buttons to scroll through the
overview screens.
Slave Overview 1 Screen
•
Safety Mode - This display indicates the module is
running in one of the Safety Modes.
Module Cntrl Status
Possible options for each module include:
•
Master Module
The module is acting as the master module and performs
temperature control function for both heating and cooling
loads. It also acts as a supervisor when communicating
with the slave modules and defines how many modules
need to run compressors in order to satisfy heating and
cooling loads.
Note: Master Module is defined by its PLC IP address. So
in the chiller Master PLC IP address is always
192.168.1.11. All Slaves IP addresses go from
192.168.1.12 to 192 to 192.168.1.20 which amounts
to nine Slaves. Each IP address has to be unique for
all the chiller devices to communicate properly
including HMI which IP address is 192.168.1.10
Master Status
This applies to the master microprocessor controller only.
Possible options:
•
Master ON - All master module conditions are
satisfied by this module
•
Waiting ... - All master module conditions are
satisfied and the module is counting down the
MASTER EN DELAY before attaining MASTER ON
status.
•
OFF by Cool Sensor - The chiller/heater cooling
temperature sensor has failed
ARTC-SVX005A-EN
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