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E² Controller
General
The advanced microprocessor based, E² Series controller is a
highly versatile and flexible A/C system controller. It is
designed primarily for vendor Precision Air Conditioners. The
controller is equipped with flexible software capable of meeting
the specific needs of the application. The controller is
completely programmed at the factory and therefore, most
applications will require no field set up. However, the default
setpoints and their ranges are easily viewed and adjusted from
the user interface display. The program and operating
parameters are permanently stored on FLASH-MEMORY in
case of power failure.
The E² Series controller is designed to manage temperature
and humidity levels to user defined setpoints via control output
signals to the A/C system. Control parameters have variable
outputs from 0 to 100% of the full rated capacity. The controller
continually receives inputs for the measurable control
conditions (temperature and relative humidity) via sensors
installed in the cabinet. The internal logic determines if the
conditions require cooling or dehumidification. Control
setpoints are established to maintain the rooms designed
conditions. The controller responds accordingly to changes
and controls the output(s) to the air conditioning system so
temperature/humidity conditions reach the user defined
control setpoints.
Features
Field Configurable
The program for the E² Series controller is field configurable,
allowing the operator the capability of selecting control
parameters and setpoints specific to the application. Operator
interface for the E² controller is provided via an attractive, door
mounted user interface display panel. The display panel has a
backlit LCD graphical display and function keys giving the user
complete control and monitoring capability of the precision
cooling system. The menu driven interface provides users the
ability to scroll through and enter various menu loops.
Monitoring of room conditions and A/C system operation is
allowed without entering a password. Modifications to the
control setpoints require the use of a password.
Password Protection
Access to the Info menu and Alarms log is allowed without the
use of a password. The controller is programmed to recognize
predetermined security levels before allowing access to
display screens containing critical variables.
Three secured menu levels (Control, Service and Factory)
support unique passwords that must be entered to access the
menu screens so only authorized personnel may perform
modifications to the settings.
AH-SVX015A-EN
Restorable Setpoint Parameters
Upon initial start-up the A/C system operates using the
setpoints programmed by the factory. The customer may enter
new operating parameters in the Control and Service menus
and the system will then operate accordingly.
The new setpoints may be stored as Customer Default
setpoints. The primary setpoints entered by the factory still
remain stored in the controllers memory as Factory setpoints.
The setpoints for the system may be re-adjusted in the Control
menu at any time. If it becomes necessary, the customer may
restore the setpoints back to the Customer Default setpoint
values or to the original Factory (primary) setpoint values in the
Service menu (see
"Save Configuration," p.
A/C Grouping pLAN Operation
Multiple A/C system controllers can be connected (grouped) to
a pLAN local network, allowing the communication of data and
information from each controller to a central control terminal or
Lead controller. The Lead controller display screens can be
used to monitor and adjust group control variables for the
individual system controllers. Each E² controller connected to
the pLAN network is to be identified with its own unique
address.
Multiple A/C units consisting of up to eight (8) vendor precision
air conditioners equipped with like controllers may be
controlled and monitored via the E² series controller. With
multiple A/C units each unit can selectively be configured as
Active to operate as a primary A/C, Capacity Assist for staged
operation or as Standby to come online in case of a failed air
conditioning unit to ensure continuous availability.
The controller may also be configured to rotate units with timed
duty cycling to promote equal run-time and assure that each A/
C unit within the rotating group is operationally exercised on a
periodic timed basis.
User Interface Display Panel
Your unit is equipped with an interface display panel typically
mounted on the front panel of the A/C unit.
Figure 16. User interface display panel
The user interface display panel features an easy to read,
backlit liquid-crystal alphanumeric display equipped with LED
illuminated function keys. The screens that appear on the user
48).
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Troubleshooting
