4. Features of the system
12
4. F eatures of the s ystem
4.1 Functions
The GD Connect 12 is an intelligent interconnected
control for up to 12 compressors, which is responsible
for keeping a pressurized air network within a relatively
small pressure band in the interests of energy
efficiency.
An optimal use and display of the compressor station
and states is provided by the colour graphic display with
touch function.
The main functions and features of the GD Connect 12
are as follows:
Choice of language settings
Guided commissioning
The user is guided through the necessary steps for
commissioning a station, compressor or extension
module.
Connection of compressors
GD compressors are directly connectable via a
data line (see chapter 4.2).
For all other compressors, an appropriate
compressor module has to be used:
Compressor module (STD)
For connecting a compressor with fixed speed or
half/full load control.
Compressor module (VSD)
For connecting a compressor with speed
regulation.
Control of compressors
Switching of the compressor based on the
calculated air need to maximize the energy-efficient
operation of the compressors.
User-defined profiles
A profile is a set of parameters (i.e. pressure band
and compressor priorities) corresponding to
different operating requirements of the station.
Up to 12 profiles are definable and can be
activated by the timer control or a programmable
digital input.
Current station status display
Touch controls can display further information
about the station (i.e. statistics, events, etc.)
Current compressor status display
Touch controls can display further information
about each compressor (i.e. operating hours,
events, etc.)
Programmable inputs and outputs
Programmable inputs and outputs can be used to
control the stations and/or output status messages
to the customer.
SD card drive
to log data from the compressed air station.
Battery buffered real time clock
Code-protected menus
to adjust all necessary parameters.
RS485 interface
The customer can use a separate RS485 interface
to communicate with the GD Connect 12.
The ModBus-RTU protocol is implemented as
standard; an optional PROFIBUS module can be
installed if required.
Extension modules
Extension modules can increase the number of
programmable inputs and outputs. Up to 4
extension modules can be added to the GD
Connect 12.
Help functions
to show wiring diagrams and necessary
adjustments to the compressor controls for
operation via the GD Connect 12.
Abbreviations
In this document and in the display of the GD Connect
12, the following abbreviations are used:
AI-x
= Analog input no. x
DI-x
= Digital input no. x
DO-x
= Digital output no. x
AC
= Alternating current
DC
= Direct current
UC
= Universal current (AC or DC)
COM
= Common connection e.g. at a
change-over contact.
STD =
Standard
VSD
= Variable Speed Drive
Overviews
Section 4.2 "Overview" shows all system components
with the appropriate order numbers.
Section 4.3 "Example of a compressed air station with
GD Connect 12" shows an example of an installation.
