090.510-M (OCT 10) FRICK
QUANTUM™LX AcuAir
CONTROL PANEL
Page 14 MAINTENANCE
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 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 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 (see Recommended
Spare Parts List) must be installed to
daisychain the signals.
The most common symptom that is be exhibited by a
low +5 Vdc voltage to the Digital Boards is an alarm
message that reads
Digital Board Reset Shutdown
.
Active LED
The Digital Board(s) have an
Active
LED indicator on
the board that blinks when the board’s software is
running.
If the
Active
LED is not blinking, check to ensure that
the EPROM is installed properly. The EPROM is
located in chip slot U8, next to the power connector.
Digital Inputs
A Digital Input is the portion of the hardware that
allows devices such as limit switches, relay contacts,
and level switches, to interface with the Quantum™.
The software program within the Quantum™ is
constantly looking at these Input channels, via
communications, and based upon whether a control
voltage is present or not, will provide the necessary
control for an associated Output channel.
The following pictorial shows a side view of the 120
VAC Input module. The color of an Input module is
yellow:
Never plug a 120 Volt Input module into a 240 Volt
system, and vice-versa. Never plug an Output module
into a position designated for an Input module.
You will notice that when a module is plugged into the
Digital board, there is a fuse located directly adjacent
to the module. This fuse is of the plugable variety, and
must be plugged into the
IN
position for an Input
module.
Digital Outputs
A Digital Output is the portion of the hardware that the
Quantum™ is to control (energize). These devices
include solenoids, relay coils, and heaters to be
energized, based upon the logic within the
Quantum™ LX software program.
The following pictorial shows a side view of the 120
VAC Output module. The color of an Output module is
black:
Although this Output module is labeled as 280 VAC
on the top, and on the side, it can be used on both
120 and 240 volt applications.
Never plug an Input module into a position designated
for an Output module.
You will notice that when a module is plugged into the
Digital Board, there is a fuse located directly adjacent
to the module. This fuse is of the plugable variety, and
must be plugged into the
OUT
position for an Output
module.
Checking the Digital Inputs and Outputs
Some problems that may be encountered involve
troubleshooting the digital inputs and outputs. The
Digital I/O (Input / Output) Boards have six Digital I/O
(DIO) board connectors labeled P1 through P6. The
Input and Output modules are wired to a DIO
connector plug. Position 3 provides power and
position 4 is a neutral on the DIO connectors.
Positions 1, 2, 5, and 6 are signal connections, as
shown below:
The Digital I/O board’s I/O modules are configured by
proper module selection, AC or DC, operating
voltage, input or output, and moving the fuse to the
in
or
out
position. An LED is associated with each
5
-
4
+
3
+
COM OUT VDC
5VDC LOGIC
2
1
90-140VAC
AC INPUT
120 VAC Input
4
-
3
+
3-8 VDC
DC CONTROL
2
1
3A 280VAC
AC OUTPUT
120 VAC Output
HOT NEUTRAL
Position
1 Signal
Position
2 Signal
Position
3 Signal
Position
4 Signal
