QUANTUM
™
LX CONDENSER/VESSEL CONTROL PANEL
MAINTENANCE
090.560-M (MAY 2016)
Page 34
DIGITAL BOARD
INFORMATION
The information that follows in this section can help
locate problems that can occur with Digital Input and
Output circuit boards, and their interaction with the Q4/
Q5 controller. Digital boards are located in the Condenser/
Vessel remote panel(s).
DIGITAL BOARD DESCRIPTION
The Digital Board is actually a small microprocessor
board and programmed to control discrete outputs, or
accept discrete inputs, from external electrical devices.
Each Digital Board has the capability of 24 independent
channels or I/O (Input/Output). With the Quantum™ LX
Condenser/Vessel Control, some of these I/O channels
are dedicated as to their function, through the operating
system (software), enabled options and external wiring.
Each channel that is used by the software will have a
module plugged into it. A yellow module indicates that it
is used for Inputs, a black module is used for Outputs. The
standard Condenser/Vessel remote panel can have up to
two Digital Boards (depending on options).
COMMUNICATIONS LED'S
The controller is in constant communication with all Digital
(and Analog) Boards. You will notice on each Digital and
Analog board, that there are a pair of LED’s labeled as
RX and TX. These letters represent Receive (RX) and
Transmit (TX). These LED’s should be ashing at a high
rate during normal operation. This indicates that the Q5
(or Q4) control board, and the Digital Board that you are
looking at, are properly communicating with each other.
• Reference the JUMPER AND DIPSWITCH
SETTINGS section later in this manual. This
section contains the dipswitch settings for
addressing the Digital I/O Boards. When these
switches are properly set, the Q4/Q5 board 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 lost or failed communications, or the
wrong outputs being energized, or the wrong
inputs being received.
CONNECTIONS TO THE QUANTUM™
The Frick
®
Condenser/Vessel control system utilizes up
to two Digital, and one Analog Boards. To connect all of
these boards together so that the Q4/Q5 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. Upon close
examination of this harness, you will notice that each
of the connectors have two rows of connections. The
wires that are inserted into the positions of one row, are
internally daisy-chained 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 daisy-
chain, these voltages and signals cannot continue through
the daisy-chain to the next board. Whenever a plug is
not to be inserted into a board, either for service or if
not all boards are present, then a shunting plug (refer to
Replacement Parts list) must be installed onto the open
connector.
The Digital Boards only require the +5 Vdc voltage and the
Return (or common) for logic power. The communications
signals (RX & TX) are required by all boards.
LOGIC VOLTAGE (POWER) LED
Located on the Digital 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 Remote panel
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
a Digital Board, the only way to actually determine this
is to read the voltage on a Digital Voltage Meter (DVM).
This may be accomplished by locating the white power/
communications connector on the board. Notice that the
Digital Board has one of these connectors on both ends of
the board. The associated power/communications harness
will only be plugged into one of these connectors. 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:
Set the DVM to read DC, and set the proper range. The
voltage reading must read a minimum of +5.0 Vdc. The
Power-I/O harness will have an associated voltage drop at
each board connection. As an example, if you are reading
the voltage at the rst I/O board in the daisy-chain, and
it reads 4.98 Vdc, you can be assured that the voltage
at the subsequent connections for the remaining boards
will be lower yet. The voltage will need to be corrected
for proper operation of the system. The cause for a low
voltage reading could be:
• The power supply may need adjustment (see the
section on power supplies).
• The Power-I/O communications harness has a
problem (a new harness may be needed).
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