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6.0 SYSTEM OPERATION
Powering Up: Double check wiring connections prior to powering up the system.
Upon application of line voltage power to the system, the LCD display will
momentarily indicate the software version number then immediately display the
system status and start to scroll through all programmed channels. The display
indicates pertinent information for each programmed channel for approximately 3
seconds before scrolling to the next channel. The information displayed is: Channel
number, Alarm status (top line), Gas type, Actual gas concentration (bottom line).
Any relays programmed as fail-safe will energize (an audible “click” can be heard).
The display can indicate “ppm” (parts per million) for toxic sensors, % LEL (Lower
Explosive Level) for combustible gases and vapors or % Vol. (percent volume) for
Oxygen or other gases.
Note:
If the fault LED (red) illuminates shortly after system
power up, allow approximately 20 to 30 seconds for the sensor to stabilize and
output the appropriate signal. If the fault condition does not go away after
approximately 30 seconds, it may indicate a wiring problem between the controller
and one or more of the remote analog sensor/transmitters.
All PAC-44 controllers are shipped, tested and programmed to customer job
requirements, assuming project details have been provided to CETCI prior to ship-
ment of the system. If project details have not been provided, all systems are tested
and shipped out with a generic program, addressing the number and type of sensors
ordered and one general zone for all sensors and relays. A label on the inside of the
PAC-44 enclosure door indicates factory default programming. A programming
sheet, unique to the controller supplied can also be found inside the enclosure.
The “AST” series remote analog transmitters are available for use with the PAC-44
controllers. The “TSM” series miniature sensor/transmitters are available for use as
one optional, internal sensor for toxic gases or Oxygen. All sensor/transmitters
supplied are pre-calibrated and ready for installation.
Signals: Eight only 4-20 mA “open loop” LED (red) indicators are provided for the
PAC-44 inputs and outputs. They are located along the lower section of the circuit
board, just above the lower wiring terminal strips. The four open loop indicators
located just above the channel 1 to 4 analog input wiring terminal strips, provide
indication of a good or bad analog signal to each channel. The four open loop
indicators located just above the 4-20 mA output wiring terminal strips, provide
indication of a good or bad analog signal connection to remote devices.
One or more of these red LEDs will illuminate if one or more of the 4-20 mA signal
loops are not connected properly or the connection is broken. This could also
indicate a burned out sensor element from a remote analog transmitter with a solid-
state or catalytic sensor element. It could also indicate an expired Oxygen sensor
element from an integral Oxygen sensor or remote Oxygen sensor/transmitter.
Alarms: Upon detection of a gas concentration above a preset level for any of the
alarm set points, the low, mid or high alarm LED will illuminate and the appropriate
relay will be activated, assuming relays have been enabled, properly programmed,
and any programmed time delays have timed out. In the event of a fault alarm
condition, the fault LED (red) will illuminate, the audible alarm will sound and any
relays programmed to respond to a fault condition will be activated.
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7.6 SYSTEM PROGRAMMING - INTPUT CODES, CONT’D…..
“1112” Zoning:
This code allows the user to selectively group one or more
channels (sensors) with one or more relays for selective output control. To achieve
this, input code “1112”, then depress push-button “3” to increment or push-button “1”
to decrement the number. Depress push-button “2” to scroll to the next channel.
Once this function is finished, continue to depress push-button “2” until you reach
the last channel and the system will automatically start to scroll through all “active”
channels.
Selection: “1, 2, 3 or 4”
“1232” Units of Measure:
This code allows the user to select the units of measure
to be displayed for each sensor connected to each channel. To achieve this, input
code “1232”, and the LCD display will indicate the units last selected for that
channel. Next, depress push-button “3” to scroll up through the choices or push-
button “1” to scroll down through the choices. Depress push-button “2” to scroll to
the next channel. Once this function is finished, continue to depress push-button “2”
until you reach the last channel and the system will automatically start to scroll
through all “active” channels.
Selection: “ppm, % LEL, % Vol., % rH,
0
C,
0
F, PSI”
“1231” Sensor Type:
This code allows the user to select a specific sensor gas type
to be displayed for each channel. This information tells the user exactly which gas is
being monitored for and which type of sensor technology has been selected to
detect it. Example “CO” (Carbon Monoxide), “el” (electrochemical). To achieve this,
input code “1231”, then depress push-button “3” or “1” to scroll through the selection.
Depress push-button “2” to scroll to the next channel. Once this function is finished,
continue to depress push-button “2” until you reach the last channel and the system
will automatically start to scroll through all “active” channels.
Selection: “CO % LEL, CO el, CO ss, CO2 ir, C3H8 ss,
C3H8 ct, NH3 ss, NH3 el, NO el, NO2 el, O2 el, O3 el, R11
ss, R12 ss, R22 ss, R123 ss, R134A ss, R507 ss, R407A ss,
R408A ss, R404A ss, HP62 ss, HP80 ss, CH4 ss, CH4 ct,
Cl2 el, Temp, Humid, Press, H2 ct, H2 ss, H2 el, Alco ct, Tol
ct, ETO el, H2S el, SO2 el, HCN el, O2 ga,
Interpretation: el = electrochemical Tol = Toluene
ss = solid-state Alco = Alcohol
ct = catalytic (pellistor for combustibles) ir = infrared
ga = galvanic (Oxygen high range) Press = pressure
Temp = Temperature
Humid = Humidity (rH relative humidity)
CH 1 Menu 1112
Input Zone 1
CH 1 Menu 1232
Units ppm
CH 1 Menu 1231
CO el
Summary of Contents for PAC-44 Series
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