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RTAC-SVX01F-EN 91
Controls Interface
CH530 Communications Overview
The Trane CH530 control system that runs the chiller consists of several elements:
• The main processor collects data, status, and diagnostic information and commu-
nicates commands to the starter module and the LLID (for Low Level Intelligent
Device) bus. The main processor has an integral display (DynaView).
• Higher level modules (e.g. starter) exist only as necessary to support system level
control and communications. The starter module provides control of the starter
when starting, running, and stopping the chiller motor. It also processes its own
diagnostics and provides motor and compressor protection.
• Low level intelligent device (LLID) bus. The main processor communicates to
each input and output device (e.g. temperature and pressure sensors, low voltage
binary inputs, analog input/output) all connected to a four-wire bus, rather than
the conventional control architecture of signal wires for each device.
• The communication interface to a building automation system (BAS).
• A service tool to provide all service/maintenance capabilities.
Main processor and service tool (TechView) software is downloadable from
www.Trane.com. The process is discussed later in this section under TechView Inter-
face.
DynaView provides bus management. It has the task of restarting the link, or filling in
for what it sees as “missing” devices when normal communications has been
degraded. Use of TechView may be required.
The CH530 uses the IPC3 protocol based on RS485 signal technology and communi-
cating at 19.2 Kbaud to allow 3 rounds of data per second on a 64-device network. A
typical four-compressor RTAC will have around 50 devices.
Most diagnostics are handled by the DynaView. If a temperature or pressure is
reported out of range by a LLID, the DynaView processes this information and calls
out the diagnostic. The individual LLIDs are not responsible for any diagnostic func
-
tions. The only exception to this is the Starter module.
NOTE: It is imperative that the CH530 Service Tool (TechView) be used to facilitate
the replacement of any LLID or reconfigure any chiller component. TechView is
discussed later in this section.
Controls Interface
Each chiller is equipped with a DynaView interface. The DynaView has the capability
to display information to the operator including the ability to adjust settings. Multiple
screens are available and text is presented in multiple languages as factory-ordered or
can be easily downloaded from www.trane.com.
TechView can be connected to either the DynaView module and provides further data,
adjustment capabilities, diagnostics information using downloadable software.
DynaView Interface
The DynaView share the same enclosure design: weatherproof and durable plastic for
use as a stand-alone device on the outside of the unit or mounted nearby.
The display on DynaView is a 1/4 VGA display with a resistive touch screen and an
LED backlight. The display area is approximately 4 inches wide by 3 inches high
(102mm x 60mm).