Rack Control Module
TM
Product Manual
Rev. 1.2, May 9, 2014
Page 10
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The following table describes a normal sequence of events for loading and unloading the
tanker. Included is the RCM response to system failures. The principal concept of RCM
operation is to deny loading until all conditions are safe. Then the terminal rack controller
receives a signal to permit loading. High level alarms are cleared to permit loading once
the product level is unloaded below the alarm settings and the power has been turned off,
then on. Loading is also automatically permitted when the tank has been near empty for
at least 1 minute. Approximately 1/4 or less of the total volume is considered near empty
to permit loading. System failures halt loading and remain in that state until the condition
clears and the system has power removed, and then reapplied. This allows the operator
to resolve the problem before loading continues.
Sequence of Events
2.2
Event Sequence -
Inputs are Battery
Power and TD80 Data
Permissive Signal
to the Terminal
Rack Controller
OFF is Loading
Denied, ON is
Permitted
Power
Indicator
Sensor 1
Indicator
Sensor 2
Indicator
Permit
Indicator
Normal Operating Conditions
1. Power off
OFF
OFF
OFF
OFF
OFF
2. Power on and less than
8VDC
OFF
Blinking
Yellow
OFF
OFF
Solid Red
3. Power on and greater
than 8VDC during
transmitter warm up
OFF
Solid
Yellow
OFF
OFF
Solid Red
4. Power on, tank empty,
Finch display shows "2
LO"
ON
Solid
Yellow
OFF
OFF
Solid
Green
5. Power on, tank loading
and below HH alarm
volume
ON
Solid
Yellow
OFF
OFF
Solid
Green
6. Power on, tank loading
and at HH alarm volume
OFF
Solid
Yellow
Solid Red
Solid Red
Solid Red
7. Power on, tank at Spill
alarm level
OFF
Solid
Yellow
Solid Red
Solid Red
Solid Red
8. Power off
OFF
OFF
OFF
OFF
OFF
9. Power on, tank at Spill
alarm level
OFF
Solid
Yellow
Solid Red
Solid Red
Solid Red