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Introduction
The MicroTech II
TM
Remote I/O Panel consists of a sheet metal enclosure housing a transformer, and remote I/O modules.
These modules provide additional input/output for use with a Chiller System Manager (CSM) supervisory controller. These
modules communicate with the supervisory controller via a two wire L
ON
W
ORKS
communications network. The panel can
be mounted at strategic locations around the building, near the controlled devices to avoid long runs of control wires back to
the supervisory controller.
A CSM can control pumps, fans, valves, boilers, etc. The supervisory controllers use remote I/O modules as an expandable
platform of inputs and outputs to control different size pump stations, cooling towers, etc. For example, a large chiller plant
may have more secondary pumps to control than a smaller plant and fewer remote I/O modules are required to control the
smaller plant.
Remote I/O modules are not application specific. All the application software resides in the CSM supervisory controller. This
means that the same remote I/O modules are used on a CSM. Remote I/O modules may be purchased separately (McQuay
part number 112024401) and mounted in the field. They can also be purchased pre-mounted in a remote I/O panel ready for
wall mounting.
A remote I/O panel may have from one to four remote I/O modules. The number of modules per panel is determined by job
requirements. See the installation manual of the supervisory controller to determine specific uses for the modules. Each
module provides the following input/outputs:
•
4 Universal Inputs
•
4 Digital Inputs
•
4 Relay Outputs (normally-open contacts rated for 6 Amps @ 230 Volts)
•
2 Analog Outputs (0-10 Volts DC)
Remote I/O panels come with either 120Volt or a 240 Volt power supplies. See the part number designation table below:
Table 1. Remote I/O Panel part numbers
Number of Modules per Panel
120 Volt
240 Volt
1
112028701
112029401
2
112029101
112029501
3
112029201
112029601
4
112029301
112029701
!
WARNING
Electric shock hazard.
Can cause personal injury or equipment damage.
This equipment must be properly grounded to the MicroTech II control panel. Connections and service must
be performed by trained personnel with experience with the equipment being controlled.
!
CAUTION
Static sensitive components.
Can cause equipment damage.
Discharge any static electrical charge by touching the bare metal inside the control panel before performing
any service work. Never unplug cables, circuit board terminal blocks, or power plugs while power is applied
to the panel.
