FCM STANDARD FEATURES
FCM STANDARD FEATURES

.24vdc ALTERNATE or
.AUXILIARY POWER INPUT
 
120vac is the normal voltage for the FCM;  however, there are some cases where it
is not available, or it may be desirable to use "battery" power.   At startup time, if
120vac power is not available, the FCM automatically switches to its 24vdc input
terminal as an alternate voltage for its internal power.

If 120vac power is interrupted for whatever reason and a 24vdc auxiliary power, such
as a battery, is connected to the FCM, it will automatically switch to its alternate
power input and normal operations continue.

This switch to 24vdc (or back) is not noticeable.
.POWER AVAILABLE LED
  This green LED is used to report that power is on and the FCM is energized.  It does
not imply the FCM is functioning properly (FCM system performance is reported by
the System Ready LED).
.SYSTEM READY LED
  This slow flashing yellow LED reports the status of the overall FCM system.  When
the system is powered on, the above POWER AVAILABLE LED is turned on and the
system undergoes a "Power On Self Test" (POST).  All features and options are
checked internally for reasonableness to ensure they are operational and within
tolerances.  If all POST checks are completed successfully, the SYSTEM READY
LED is turn on and the FCM is then operational.
.ELECTRONIC FUEL LEVEL
.GAUGE
  This gauge is an electronic measurement of the fuel level.  It features a set of eight
LED’s to report the usable fuel in the tank.  The 100% or FULL level is normally set
to the Fill Pump shut off level (not the top of the tank); the EMPTY level of the gauge
is normally set to the bottom of the tank.   Each lighted LED represents fuel present
at a linear determination of about 1/8 of the calculated usable span.
.HOA SWITCH
  This is actually a series of three switches per pump motor that function as an HOA
switch in an OFF, ON and AUTO position.  In an ON position, the FCM surrenders
control of the pump motor except actions at the specified control points -- Critical
High, High Fuel, Low Fuel, and the Critical Low fuel levels. In the AUTO position, the
FCM automatically controls the activities of the motors based upon fuel level
readings and control points.   The FCM has no control of a pump motor when
switched to the OFF position.
.SYSTEM TEST SWITCH
.(CONTROL PANEL)
  This feature is used for a visual test of the LED’s only.   When pressed, all LED’s on
the control panel are lit and should be illuminated.   It does not test any
monitor/control functions of the FCM.
.ALARM TEST SWITCH
  This feature actually tests the controls and relays associated with the four alarm
levels (Critical High, High Fuel, Low Fuel and Critical Low), and the four pump fail
functions.   It is also a local visual test that will notify the operator of any error by
hanging at the function in error.
.ALARM RESET SWITCH
  This optional switch, located on the control panel, is used to turn off a visual alarm
that had reported an abnormal condition that was corrected.

When an abnormal condition exists, it is reported by changing the appropriate LED
to a flashing ON state and sounds a horn, if installed. The LED continues to flash
until the condition is corrected. Then:

  • if this option is not active, the LED is turned off automatically when the
    condition is corrected.
  • if this option is active, "Alarm Latching" is also active. Alarm Latching changes
    the flashing LED to a solidly lit LED when the condition is satisfied. This
    provides an historical account that an abnormal condition did occur. The solid
    LED remains lit until this optional switch is pressed.
.ALARM SILENCE SWITCH
  This optional switch, also located on the control panel, is used to turn off an installed
alarm horn that is sounding as an abnormal condition exists.  (The horn will shut off
automatically when the condition is corrected.)  This is welcome relief to workers who
are correcting the problem.
.SAFETY HIGH FUEL LEVEL
.FEATURE
  This standard feature is always installed. It acts as a mechanical fail-safe to prevent
flooding should an electronic fault occur preventing the Fill Pumps/Motors from
shutting off at the specified level.

The Safety High Level is always set to 3.0" down from the top of the tank.   It will
always shut off all Fill Pump/Motors (internally controlled by FCM).

Two sets of Dry Contacts  are provided (1 - N.O. and 1 - N.C.).   If the day tank is
supplied by a gravity-feed main tank, this is a good place to receive a signal to close
a normally open solenoid valve in the intake line.   The customer must supply
external power for any remote alarms/lights.
.HIGH FUEL LEVEL
.FEATURE
  This standard feature is always installed. In its basic setup, when the fuel reaches a
specified "high" level, it turns on a High Fuel Light/Alarm and, as a safety feature,
activates the "Shut Fill Pump(s) Down" feature.

The High Fuel Level is normally set to 3.5" down from the top of the tank.

Additionally, two sets of Dry Contacts  are provided (1 - N.O. and 1 - N.C.) for remote
annunciation.  The customer must supply external power for any remote
alarms/lights.
.LOW FUEL LEVEL
.FEATURE
  This standard feature is always installed. When the fuel reaches a specified "low"
level (see below), it turns on a light on the control panel and will shut off any installed
Reverse-Flow Pumps/Motors.

Low Fuel Level is normally set at predetermined distance from the top of the tank.  
These settings are:

  • Py5 & PY10 --------------  7.0"
  • Py15 ----------------------- 12.0"
  • Py25 - PY150 ----------- 14.0"
  • Py200 - PY1000 ------- 18.0"

Two sets of Dry Contacts are provided (1 - N.O. and 1 - N.C.) for remote
annunciation.  The customer must supply external power for any remote
alarms/lights.
."DRY TANK" PREVENTION
  This feature is to prevent the emptying of the tank due to reverse flow pump-out. If
the customer did not purchase a Critical Low option, this feature is installed for
fail-safe protection.  Unlike a Critical Low, it does not support generator engine shut
down or remote annunciation.
.SECONDARY
.CONTAINMENT
.SWITCH
  This is a standard feature that is activated when secondary containment is
purchased.  It will light an LED on the control panel and activate an alarm.

Additionally, two sets of Dry Contacts are provided (1 - N.O. and 1 - N.C.) for remote
annunciation.  The customer must supply external power for any remote
alarms/lights.
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Under the "hood" of the standard FUEL CONTROL and
MONITORING (FCM)
housing is the electronic wizardry.   
There is an
Interface Board, which is designed to
receive all external connections.  

Positioned beneath the Interface Board, to optimize
space and, more importantly, to inhibit access to the
more delicate components, is the
Main Logic Board or
the brains of the system.  Located close to the Interface
Board is an
Ultra-Sonic Sensor which reports the level
of the fuel in the tank to the computer -- it is the "eyes"
and "ears" of the FCM system.  

A list of Standard Features and their descriptions appear
below.
FUEL CONTROL & MONITORING SYSTEM
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