Emerson E2 - Manual (Page 71)

ECT MODBUS The RS485 Network and Hardware Setup • 6 - 11
6.3.9 Refrigerant Leak Detection
System (RLDS)
The RLDS provides for the continuous monitoring of
refrigerant gas levels in up to 16 separate test zones or
channels. The instrument is programmed to monitor a
variety of gases and independent leak (small), spill
(medium), and evacuation (large) levels may be desig-
nated for each zone. The instrument also retains a log of
previous readings that can be accessed for analysis.
The RLDS has alarm level configuration parameters
that are synchronized. These will be read first from the
device. The E2 will be master of all other parameters. An
audible alarm and front panel indicators are provided to
signal alarm and fault conditions, and relay contacts are
provided that can be used to trigger external alarm devices
in the event of a system fault, or if a leak (small), spill
(medium), or evacuation (large) level of gas is detected.
The system also may be fitted with an optional two-chan-
nel 4-20mA current loop board for connection to remote
monitoring equipment.
The RLDS features full two-way communications via
an RS485 interface. MODBUS RTU is the communication
protocol standard and can be connected directly to an E2
controller version 3.02 and above. The RLDS is dynami-
cally licensed for 15 devices for RX/BX/CX 300-500 and
1 for RX100 and CX100 (same as IRLDS).
6.3.9.1 Diagnostic Alarms
6.3.10 Copeland Scroll – K5 Refrig-
eration Compressor
The Copeland Scroll — K5 Refrigeration Compressor
(Lrg Ref Scroll) application can monitor large type com-
pressors using the MODBUS network on E2 versions 3.02
and above. The Copeland Scroll — K5 Refrigeration is
supported on E2 CX-400, CX-100 and above. The E2
monitors and records compressor information, configura-
tion setup, status display, and alarm handling. The Cope-
land Scroll — K5 Refrigeration will be associated with the
suction group from the Compressor Association screen.
The scroll can be associated by pressing
 -
Controller Associations then  - Compressor.
Figure 6-8 - RLDS
Diagnostic Alarm Descriptions
Box Temp Fault Chassis temperature is out of range
Bench Temp Fault Sensor temperature is out of range
Manifold Pressure Fault Pressure readings out of range
RS-485 Fault Communication Error
Loop Fault Current loop is open
Config. Fault No zones are enabled
Zero Filter Fault Charcoal filter needs repl.
Gain Set Fault Gain setting is out of range
A2D Fault A/D converter is not working
Zone Flow Fault No flow during sample cycle
Purge Flow Fault No flow during purge cycle
Over Range Fault Conc. above measurable range
Zero Range Fault Sensor voltage outside limits
Clipping Fault Sensor output voltage too high
Table 6-7 -Diagnostic Alarm Outputs
Figure 6-9 - Compressor Association Screen