FRICK
QUANTUM™ COMPRESSOR CONTROL PANEL S90-010 M
MAINTENANCE Page 19
ANALOG BOARDS
The information that follows in this section can help locate
problems that can occur with Analog Input and Output
circuit boards, and their interaction with the Quantum™
controller.
Analog Board Description
The Analog Board is actually a small microprocessor
board and programmed to control analog outputs, or
accepting inputs, from external electrical devices. Each
Analog Board has the capability of 16 independent
channels or I/O (Input/Output). With the Quantum™
Compressor Control, these I/O channels are dedicated,
through the software and external wring, as to the function
of each channel. Each channel that is used by the
software will have to be configured for the type of device
that is connected to it (4-20 mA, 0-5 v, 1-5 v or ICTD). The
standard Quantum™ compressor control can have up to
two Analog Boards (depending on options).
Communications LED's
The Quantum™ controller is in constant communication
with all Analog (and Digital) Boards. You will notice on
each Analog and Digital board, that there are a pair of
LED's that are labeled as RX and TX. These letters
represent Receive (RX) and Transmit (TX). These LED's
should be flashing at a fairly high rate during normal
operation. This indicates that the Quantum™, and the
board that you are looking at, are properly communicating
with each other.
• Reference the “JUMPER AND DIPSWITCH
SETTINGS” section later in this section. This
section contains the dipswitch settings for
addressing the Analog I/O Board numbers (1)
through (6), although only the first two boards
can be addressed. When these switches are
properly set, the Quantum™ is able to serially
communicate with each I/O board and provide
control signals and data exchange. If these
switches are not properly set, the result will be
one of the following:
• Lost or failed communications (displayed in
the “Communications Status” box on the
Home screen)
• The wrong analog input signals being
received
• The wrong analog output signals being sent
from the board.
Connections to the Quantum™
As stated earlier, the Quantum™ standard compressor
control system utilizes up to two Digital, and two Analog
Boards. To connect all of these boards together so that
the Quantum™ can control them, they must be
interconnected with a wiring harness that provides all of
the necessary D.C. voltage requirements, as well as the
communications capabilities. A diagram of this wiring
harness can be found later in this manual (see the Power
I/O Wiring Harness drawing). This harness has an 18 pin
connector at one end, that plugs into the Quantum™.
Another connector plugs into the power supply. The
remaining four connectors (16 pin) will plug into each of
the Digital and Analog Boards in the system (up to four
total).
Upon close examination of this harness, you will notice
that each of the connectors for both the Quantum™ and
the four I/O boards, have two rows of connections. The
wires that are inserted into the positions of one row, are
internally daisychained on each I/O board, to continue the
voltages and signals to the adjacent row. Therefore, any
time that a connector is unplugged from the daisychain,
these voltages and signals cannot continue through to the
next board. Whenever a plug is not to be inserted onto a
board, either for servicing, or if not all boards are present
because of the options that are present, then a shunting
plug (refer to the Recommended Spare Parts list) must be
installed onto the open connector.
The four wires that feed from the power supply to the
Quantum™ provide all of the necessary D.C. voltage that
is required (+5 Vdc, -12 Vdc, +12 Vdc, and Return or
Common). The voltages are passed through the connector
on the Quantum™, and two new signals are generated by
the Quantum™ to be passed on through the daisychain to
the I/O boards. These two signals are the RX (receive)
and TX (transmit). These signals are the means by which
the Quantum™ communicates to the I/O.
The Analog Boards require the +5 Vdc for logic, the
-12 Vdc for internal voltage reference, and +12 Vdc for
external sensors (plus or +) and the Return (common or -).
The communications signals (RX & TX) are required by all
boards.
Logic Voltage (Power) LED
Located on the Analog Board is a “Power” LED. This LED
will be illuminated as long as the “Control Power” switch is
ON, and the proper voltage is present at the Quantum™
power supply. The power supply generates the +5 Vdc
voltage, and passes it on through the Power-I/O harness.
This LED does not indicate however that the proper
voltage is necessarily present at the board, only that the
voltage is enough to energize the voltage sensing circuitry.
If a voltage related problem is suspected with regard to an
Analog Board, the only way to actually determine this is to
read the voltage on a DVM. This may be accomplished by
locating the white power/communications connector on the
board. Notice that the Analog Board has only one of these
connectors. The associated power/communications
harness plugs in to it. Take the red (positive) probe of the
DVM and carefully insert the end into the “+5V” lead, and
the black (negative) probe end into the “RET” (Return or
Common) lead, as shown below:
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