QUANTUM
™
LX CONDENSER/VESSEL CONTROL PANEL
MAINTENANCE
090.560-M (MAY 2016)
Page 35
• 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:
Signal
Signal
Signal
Signal
The Digital I/O board’s I/O modules are congured 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 module and
displays the state of each module. A lit LED represents
an Input that is High, receiving a signal or an Output that
is On.
If a properly congured Digital I/O is not responding
correctly, rst look at the Digital Board on the Digital I/O
Screen and check if the module is on. If it is not on, check
if the LED on the Digital Board is also not lit. If the LED is
not lit, then check the fuse. If the fuse is OK, then check
the module.
FUSE TESTING AND REPLACEMENT
1. Power off the panel.
2. Open the panel door.
3. Remove the questionable fuse.
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