MICON 500C Electronic Sequencing
36
234AY00.INS R06
Computer Installation Guide
8.5
RESTART TIMEOUT AND NOISE BLANKING (CONT’D)
The restart timeout and noise blanking work together to stop and restart the fill as many times as
necessary to ensure that the end-of-fill is at an accurate pressure before the fill is completely
terminated.
NOISE BLANKING DELAY:
The Noise Blanking Delay is a preset time delay which is immediately activated every time any flow
control valves are opened. This delay is intended to blank or ignore pressure spikes or pressure
"noises" which typically occur at the opening of the main flow valve, or at bank switchovers, and which
dissipate rapidly once a stable flow is achieved.
RESTART TIMEOUT:
The restart timeout is a time delay which is automatically activated when the pressure-temperature
compensation system has determined a normal end of-fill, as described in scenarios 1, 2, and 3 on
preceding page. The restart timeout gives the system a chance to reach a lower settled pressure than
the end-of-fill condition, and continue the fill. In this way, the system essentially ensures the dispenser
pressure transducers were reading an accurate end-of-fill condition when they stopped the fill, and
were not reading a false higher pressure due to such elements as extreme flow restrictions, etc. If,
after the restart timeout, the pressure is still at or above the end-of-fill pressure, the fill is then fully
terminated.
8.6
EXCESS FLOW / EXCESS FILL*
Various jurisdictions associate different levels of importance to these features for safety shutdowns, so
this system is fully adjustable and able to respond to a variety of code requirements.
EXCESS FLOW:
The Excess Flow safety feature is virtually the same as a "high flow cutoff”. A maximum flow value (in
units of calibration per minute) is preset using the INFO-PAC transmitter. When the measured flow
rate exceeds this preset value, a system shutdown occurs, with two selectable methods of reset
available.
Reset Method 1:
This option is intended for use in jurisdictions where an excess flow feature is not considered a
necessity. When an excess flow condition occurs, a shutdown terminates the fill. A reset of the handle
switch restores the “normal” operational state.
* EXCESS FLOW AND EXCESS FILL SETTINGS ARE CONFIGURED TO MICON 500C PUMPHEADS USING THE INFO-PAC. THE
EXCESS FILL SETTING IS DEFINED AS
EXCESS RESET
ON INFO-PACS USING SOFTWARE VERSIONS 3.0 AND UP.
