Rack Control Module
TM
Product Manual
Rev. 1.2, May 9, 2014 Page 10
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
Normal Operating Conditions
2. Power on and less than
8VDC
3. Power on and greater
than 8VDC during
transmitter warm up
4. Power on, tank empty,
Finch display shows "2
LO"
5. Power on, tank loading
and below HH alarm
volume
6. Power on, tank loading
and at HH alarm volume
7. Power on, tank at Spill
alarm level
9. Power on, tank at Spill
alarm level
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