FRICK
QUANTUM™LX AcuAir
CONTROL PANEL 090.510-M (OCT 10)
MAINTENANCE Page 19
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 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 required D.C. voltages
(+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 daisy-
chain to the I/O boards. These two signals are the RX
(receive) and TX (transmit). These signals are the
means by which the Quantum™ LX communicates to
the I/O.
The Analog Board requires 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’s
Located on the Analog Board are two power LED’s.
The first of these is D1 LED (+5VDC), and will be
illuminated as long as the Control Power switch is
ON, and the proper voltage is present at Analog
Board connector P3. 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 the Analog Board, the best way to actually
determine this is to read the voltage on a DVM (Digital
Volt Meter). 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:
Set the DVM to read DC, and set the proper range.
The voltage reading must read a minimum of +4.98
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 first 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 Quantum™ 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).
A problem may exist with one of the I/O
boards (Digital or Analog).
If the power LED is not lighted, check the
cable for proper connectivity.
Note: Each
board provides the necessary
connections to feed all signals to the
following connectors. If the auxiliary
Analog or Digital Board is not present
then a jumper plug (Part # 640B0039H01)
must be installed to daisy-chain the
signals.
The second power LED is D5 (+24Vdc). This +24Vdc
voltage is generated on the Analog Board from the
+5Vdc supply being fed from the Quantum™ LX
power supply. If the +5Vdc is present as stated
earlier, then this LED will illuminate if the on-board
+24Vdc supply is functioning properly.
Active LED
The Analog Board has an
Active
LED indicator that
blinks when the board’s software is running.
If the
Active
LED is not blinking, it could be an
indication that the internal program is not running. Try
powering the Quantum™ 4 controller off, then back
on to see if the
Active
light starts blinking. If not, a
new board may be required.
Analog Inputs
An Analog Input is the portion of the hardware that
allows devices such as temperature sensors and
pressure transducers, to interface with the
Quantum™ 4. The software program within the
Quantum™ 4 is constantly looking at these Input
channels, via communications, and based upon what
the voltage or current level of the channel is, will
provide the necessary control for an associated
action.
Analog inputs arrive at the board on connectors P4
through P10. Each of these connectors can receive
two channels (for a total of twenty-four).
+5V
RET
