5-7
95-8533
18.2
DEVICE CALIBRATION LOGS
AND RECORDS
The DCU keeps a calibration log in non-volatile
memory that can be used by the operator to
evaluate the remaining life of some sensors.
This log includes the zero, span, date and
time for each successful calibration. An
aborted calibration is indicated by zeros in the
zero and span values. The calibration log is
cleared when the sensor replacement switch
is pressed and the calibration is successfully
completed.
The initial calibration is logged in position
one, where it remains for the life of the
sensor. If more than eight calibrations are
performed without the sensor replacement
switch being pressed, the newest calibration
data will replace the second oldest so that
the initial calibration data can be saved. The
old calibration data will be lost. This feature
enables sensor sensitivity trending to aid in
maintenance or troubleshooting.
The analog value for the sensor is represented
in raw analog-to-digital counts 0 to 4095,
where 0 represents 0 ma and 4095 represents
24 mA.
TROUBLESHOOTING
Tables 5-1 and 5-2 are provided to assist in
locating the source of a system problem.
REPLACEMENT PARTS
Eagle Quantum Premier devices are not
designed to be repaired in the field. If a
problem should develop, first carefully
check for proper wiring, programming and
calibration. If it is determined that the problem
is caused by an electronic defect, the device
must be returned to the factory for repair.
NOTE
When replacing a device, be sure that
all rocker switches on the replacement
are set the same as the original device.
Consult the settings documented
during system installation and setup to
determine proper settings for the new
device. Remove power before removing
a device or plugging in a replacement
unit. When a device is replaced,
conguration is done automatically.
DEVICE REPAIR AND
RETURN
Prior to returning devices or components,
contact the nearest local Detector Electronics
office so that a Service Order number can be
assigned. A written statement describing the
malfunction must accompany the returned
device or component to expedite finding the
cause of the failure.
Pack the unit or component properly. Use
sufficient packing material in addition to an
antistatic bag or aluminum-backed cardboard
as protection from electrostatic discharge.
Return all equipment transportation prepaid to
the factory in Minneapolis.
Table 5-1—Troubleshooting Guide - DCIO Module
I/O Type
Normal
(Off)
Normal
(On)
Open
(Off)
Open
(On)
Short
(Off)
Short
(On)
Unsupervised Input –15.4 0 –15.4 –15.4 0 0
Supervised Input (EOL Resistor) –14.4 0 –15.4 –15.4 0 0
Supervised Input (EOL/Inline Resistors) –15.4 –15 –15.4 –15.4 0 0
Unsupervised Output –15.4 23.9 –15.4 23.9 0 0
Supervised Output (Agent Release)
0 to 2.1
Note 2
23.9 –15.4 23.9 0 0
Supervised Output (Notification) –14.4 23.9 –15.4 23.9 0 0
Notes:
1. All measurements are in Volts and are measured in reference to the common terminal and 24.0 Vdc is the
module’s input.
2. Value is dependent on the resistance of the solenoid attached.
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