Computer Weld GTFM IV, Руководство по эксплуатации и установке

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4.0 SETTING GAS FLOW CONTROL LIMITS
4.1 Description
To use the GTFM as a Sure-Flow gas switch, the user can set the upper (" H ") and
Lower ( "L") limits by using the "PGM" toggle switch. The GTFM will activate the
internal fault relay as long as the gas flow remains above the lower limit and below
the upper limit. If the gas flow rate moves outside of the control limits the fault relay
will be deactivated. The
"D" parameter is used to delay the start of high limit testing.
The value of this parameter will determine when the GTFM will begin testing for the
upper control limit after the gas flow is initiated. The lower limit is always being check
during the gas flow period. A high gas flow fault will only occur after this time period
has expired. The
"T" parameter is used to specify the amount of time that the gas
flow rate must be continuously above or below the control limits before setting a gas
fault condition.
4.2 Setup
To set the lower limit select the "L" parameter by pressing the "MODE" switch to the
up ( "SET") position until the "L" parameter is displayed. While viewing the "L"
parameter press the "MODE" switch to the down ( "PGM") position to increment to the
desired value. To set the Upper limit select the "H" parameter by consecutively
pressing the "MODE" switch to the up ( "SET") position until the "H" parameter is
displayed. While viewing the "H" parameter press the "MODE" switch to the down
( "PGM") position to increment to the desired value.
NOTE: The lower limit will increment up to the value set by the upper ("H") parameter
then it will reset to the 0. The High limit will increment to 255 then reset to the
lower ("L") parameter value.
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