Operation - Stream Configuration
Part No.: 4418309_Rev09 Fusion4 MSC-L
Honeywell Installation & Operation Manual 5 - 147
5.14.1.2.1.1 Pump Feedback
If the [Pump feedback] I/O binding is defined, then the controller should
generate an error, if the pump indication input is inactive after the
pump demand is active.
The allowable delay is defined by the [Pump feedback timeout] entity
(defined in the alarm settings submenu for this alarm).
5.14.1.2.1.2 Tank Low Level Switch
Supply-tank level monitoring is useful in applications where a very small
supply tank is used. This is typical in portable or mobile applications
such as truck-mounted systems.
By monitoring a hardware input connected to a level switch in the
supply tank, the controller can detect when the level in the tank is
nearing empty, and take appropriate action. This prevents the pump
from running completely dry, and prevents fueling operations from being
interrupted mid-load.
The tank-level signals used must provide a simple form contact closure
upon detection of a low level (in excess of some low point) in the supply
tank. Consideration must be given to the pump intake position in the
tank and to the amount of blend volume required for a normal fuel
delivery.
The switch-activation level must be positioned so that it is slightly higher
than the level required for normal delivery. If the tank low-level switch
indicates “low” immediately upon the start of the delivery, there is still an
adequate volume in the tank to allow the delivery to complete prior to
the pump inlet drawing air.
If the low-level condition exists, the MSC-L can operate under normal
condition. To clear the tank low-level signal, the tank must be refilled to
a point that closes the level switch. At that time, the alarm disappears.
There is no need to reset the condition as with normal alarms.
5.14.1.2.1.3 Tank Empty Switch
If the tank-empty condition exists, the MSC-L cannot operate under
normal condition. To clear the tank-empty signal, the tank must be
refilled to a point that closes the level switch. At that instance, the alarm
disappears and the MSC-L resumes to normal use. It is not required to
reset the condition with normal alarms.
5.14.1.2.1.4 Hydraulic Pump Feedback
If the product stream [Hydraulic pump feedback] I/O binding is defined,
then the controller should generate an error if the hydraulic pump
indication input is inactive after the hydraulic pump demand is active.
The allowable delay is defined by the [Hydraulic pump feedback timeout]
entity (defined in the alarm settings submenu for this alarm).
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