090.510-M (OCT 10) FRICK
QUANTUM™LX AcuAir
CONTROL PANEL
Page 20 MAINTENANCE
Analog Outputs
An Analog Output is the portion of the hardware that
the Quantum™ 4 uses to provide control. These
outputs are dedicated for a 4-20 mA signal and
cannot be changed through the software
configuration.
Troubleshooting the Analog Inputs and Outputs
Some problems that may be encountered involve
troubleshooting the Analog inputs and outputs. The
Analog Board has twelve Analog I/O board
connectors labeled P4 through P10. The external
Analog devices are wired to a connector plug.
Position 1 connects to the plus (+) of the external
device for channel 1, position 2 connects to the signal
(SIG) of the external device for channel 1 and position
3 connects to ground (GND) of the external device for
channel 1. Position 4 connects to the plus (+) of the
external device for channel 2, position 5 connects to
the signal (SIG) of the external device for channel 2
and position 6 connects to ground (GND) of the
external device for channel 2, as shown below:
Each input channel is configurable through the
operating software. There are twenty-four analog
input channels that can be selected for 4-20 mA, 0-5
Vdc, ICTD, or RTD. Besides properly setting the
software configuration, each channel is setup through
software calibration for the proper transducer type
and range, and each transducer must be calibrated
through the appropriate sensor calibration screen.
Improper setup of either the hardware or software will
result in incorrect operation or range.
The most common fault associated with the improper
reading of the analog channels other than hardware
or software setup problems fall into one of the
following categories:
Sensor fault
Wiring problem
Improper grounding of system.
An open wire, shorted wire, or faulty sensor will
usually give a reading at either the minimum or
maximum end of the range scale. An erratic reading
or a reading that seems to float up and down is
usually indicative of a grounding problem. When a
single transducer or cable is shorted to earth (or
system) ground, this can show up as a whole
assortment of problem channels. The easiest way to
find a short to earth problem is to disconnect all the
sensor plugs and ohm out each plug screw terminal to
earth for open (infinite) impedance. All sensors should
read open to earth. The third pin on pressure sensors
is ground.
Replacing a Defective Analog Board
The procedure to replace an Analog board is outlined
below:
1.
Ensure that all channel configuration
information for the board being replaced has
been written down.
2.
Shut off control power.
3.
Unplug all connectors from the board.
4.
Remove the old board from the unit and
remove the new board from its packing and
place both on an anti-static surface.
5.
Check that all jumpers, dipswitches and
components are properly setup on the new
board using the old board as a reference
(refer to the Analog Settings tables near the
end of this section).
6.
7.
Install the modified replacement board in the
panel.
8.
Plug all connectors back in.
9.
Turn on control power.
10.
After the Quantum™ 4 has rebooted, access
the Analog Board Configuration Setup
screen, and re-enter the correct channel
configuration. The default setup of the new
board will be loaded to the processor. It is
imperative that the channel configuration
screen be accessed to ensure that the
channels are configured properly for the
application.
After replacing or installing an Analog Board and
powering on the control panel, select User Level 1 or
higher, then select the
Setpoints
Menu, then the
Communications
Menu. On the Communications
Screen is a button labeled as
[Redetect I/O Comms]
.
Clicking on the
[Redetect I/O Comms]
button will
cause the controller to examine the internal I/O
communications of the panel, and initialize all
connected boards. If a board has been removed, a
communication error shutdown will be issued until this
key is selected. The
About
screen will show what
was detected.
The
[Redetect I/O Boards]
key will cause the
controller to redetect all the I/O boards which are
connected to the system. Once the redetect has
completed, the controller will manage, and
communicate with all the detected boards. Please
refer to the
About
screen to verify that all I/O boards
were correctly identified.
GND
Channel 2
+
Channel 1
+
Channel 1
Signal
Channel 2
Signal
GND
