MICON 500C Electronic Sequencing
37
234AY00.INS R06
Computer Installation Guide
8.6
EXCESS FLOW / EXCESS FILL (CONT’D)
Reset Method 2:
This option terminates the fill on an excess flow shutdown. The MRST (manual reset switch) input
requires resetting before the system returns to "normal" operational state.
EXCESS FILL (OR EXCESS RESET):
The Excess Fill feature is an additional safety shutdown with limited applications. This feature is useful
for detecting hose ruptures. The Excess Fill value is the maximum possible quantity of fuel which can
be dispensed for the particular filling application. It is preset using the INFO-PAC transmitter, using
units which match the current MICON 500C calibration units.
The software continuously monitors the actual quantity of fuel delivered and compares it to the preset
excess fill value. When the amount delivered exceeds this value, an excess fill alarm is triggered, and
the MICON 500C is shut down. Because the applications for this system are limited, the Excess Fill
system can only be reset manually through the MRST (manual reset switch) input.
The Excess Fill feature is particularly useful for fixed applications such as transit refueling. Transit
buses have a calculated standard maximum amount of fuel that can be accommodated, before it can
be assumed that a hose is broken or there is a serious leak.
8.7
OPTIONAL PARAMETERS
There are optional parameters settable using the INFO-PAC transmitter associated with use of:
a) dispensers using turbine-type meters and/or
b) compensation systems using pressure transducers and temperature probes
A
TURBINE
meter enable setting on the INFO-PAC is for CNG dispensers using volumetric turbine-
type meters. Appropriate hardware modifications have to be performed on the MICON 500C
mainboard, including a fuse installation, for the TURBINE setting to take effect.
If a) above is selected, b) must also be selected. Related settings are described below. See INFO-PAC
MICON 500C Programming Manual (software version: 3.0) for further details.
Ø
COMP. SYSTEM pfs
(compensation system; pressure fill stop)
This option is for systems functioning using pressure transducers and temperature probes.
Ø
FILL PRESS (fill pressure)
This option permits setting of Operating Compensated Fill Pressure, and works only in
conjunction with COMP. SYSTEM pfs.
Ø
PRESS UNIT (pressure units)
This option permits setting of Pressure Transducer Scaling Units (PTSU). This setting
selects the units used for all pressure interfaces in the system (i.e., psig, barg). It works only
in conjunction with COMP. SYSTEM pfs.
