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CLASSIC
®
800 Product Manual
Glossary
Section
8
Thermal Dispersion
CLASSIC
™
800
1
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Active RTD
The active RTD detects and outputs a signal to the Electronics Module which is
proportionate to the process media temperature plus the heat added by the heater.
Analog Output
The CLASSIC provides a standard 4-20 mA current loop analog output. The output can be
configured for Forward or Reverse operation (either rises as thermal signal increases or
falls as thermal signal increases). The output value in the case of hardware failure (either
Fault Mode, or offline during configuration) can be configured to 3 mA or 21 mA as per
NAMUR NE 43.
Brownout
Supply power voltage has descended below the specified minimum requirement and
recovered without being considered a power failure (or a power cycle). Correct operation
is not guaranteed.
Bypass
Indicates the unit is in “Start-up Bypass Mode”, which forces both relays to be energized
for the duration of the Start-up Bypass Timer.
Current
Refers to the presence or absence of current flow in the 4-20 mA current loop analog
output. RCMS provides a loop “Current” indicator showing if there is current flowing in the
loop, or if the loop circuit is broken (also available for reading via a Modbus register, refer
to the CLASSIC Modbus specification for details).
Cycle Power
The CLASSIC re-starts operation, the state (e.g. Fault State) is reset, the CLASSIC
performs a self-test and enters RUN mode if no fault conditions are present.
Delay
The CLASSIC includes a number of delay timers to fine-tune operation and relay
actuation. These options are configurable using RCMS or by accessing Modbus registers
(refer to the CLASSIC Modbus specification for details).
The Bypass Delay Timer sets an initial period to energize the relays before using the
configured set points. Setting a bypass delay can be useful in applications such as a low
flow alarm pump control when there is no process flow present when the CLASSIC starts
up. Setting a Bypass Delay time allows the CLASSIC to start the pump and establish
process flow before monitoring the process flow.
OFF to ON and ON to OFF Delay Timers allow fine-tuning of relay actuation for situations
where there is process surge.
Factory Re-Set
Restores default configuration (refer to Configuration Menu tree diagram for default
configuration parameter values) and clears the Fault log. The CLASSIC re-starts operation
as if power was cycled (see Cycle Power).
Fault
Indicates a self-test error (call Technical Support for further information).
Fault Log
The CLASSIC maintains a list of recent fault events. The fault events can be displayed
using RCMS or by accessing Modbus registers (refer to the CLASSIC Modbus
specification for details).
Firmware
The internal software of a CLASSIC and is associated with a version identifier.
