Emerson Site Supervisor, Руководство пользователя

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Site Supervisor Controller User Guide 2.0 026-1800 Rev 3 02-AUG-2016
5.19 RLDS (Refrigerant
Leak Detector System)
The RLDS device detects the presence of gas leaks and
provides for the continuous monitoring of refrigerant gas
levels in up to 16 separate test zones or channels. The
system is programmed to monitor a variety of gases and
independent leak (small), spill (medium), and evacuation
(large) levels may be designated for each zone. The RLDS
also retains a log of previous readings that can be accessed
for analysis. For more information on the RLDS, refer to
the RLDS user manual
(P/N 026-1309)
.
5.19.1 Communication
The RLDS features full two-way communications via
the RS485 interface. MODBUS RTU is the
communication protocol standard and can be connected
directly to Site Supervisor.
The device default serial setup values are:
•
Baud rate
- 19200
•
Data size
- 8
•
Parity
- N
•
Stop bits
- 1
5.19.2 Supported Gases
The RLDS gas software library allows each zone to be
independently selected to monitor any commonly used
refrigerant including, but not limited to, the following:
R22, R134a, R404A, R407A, R407C, R410A, R422A,
R422D, R427A, R507, CO2, and Ammonia.
5.20 MRLDS (Modular
Refrigerant Leak
Detector Sensor)
The MRLDS continuously monitors for low levels of
refrigerants most commonly used in commercial refrigera-
tion systems.
The MRLDS communicates with the Site Supervisor
or analog input via MODBUS. Site Supervisor provides an
interface while the MRLDS provides the leak monitoring
functionality. For more information on MRLDS, refer to
the MRLDS user manual
(P/N 026- 1307)
.
5.21 Control Link Anti-
Condensate Controller
(CL ACC)
CL ACC can be added, deleted, and commissioned,
can take actions on alarm instances, and support data
handling.
The Serial Connection Manager can create the
MODBUS Master process based on the settings in System
Settings. If no MODBUS connections are defined, no
MODBUS processes can be created. Also, if a connection
is changed, the previous connection will stop, and the new
connection is created. In the case of MODBUS, Serial
Connection Manager will stop the associated MODBUS
process.
5.21.1 Alarm Handling Logic
If any alarm condition exists, the General Alarm
Output is set to ON. The individual alarm outputs is set
according to which is alarm is present. If the condition
clears, the alarm is reset automatically.
5.21.2 Alarms Configuration
The alarms can be individually set to their advisory
type (Notice, Non-Critical, Critical), Category, Display
Message, Repeat Rate, and Monitoring. (The device will
generate the alarm and does not have any way to
externally disable it).
5.22 HVAC Zone
An
HVAC Zone
is a collection of up to sixteen rooftop
units or air handling units that work together to maintain
the same temperature and humidity throughout a particular
volume of space. The primary function of an HVAC Zone
is to “manage” the operation of each individual HVAC
unit by providing the temperature setpoints that will be
used in Temperature Control. Zones are also responsible
for ordering HVAC units to dehumidify and determining
when outside air conditions are favorable to economize.
HVAC Zones can be edited, deleted, and associated
with other applications and devices and copy built-in
properties of an instance of an HVAC Zone.
5.22.1 How It Works
An HVAC Zone is built by creating an HVAC Zone
application in the Site Supervisor device. All HVAC unit
applications that are part of the HVAC Zone must be
connected with the HVAC Zone application. This
connection process is known as “association.”