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2.4.2 Keypad
The 12-key keypad (See Fig. 1.2) consists of the 10 digits, 0-9, plus a decimal point and
minus/backspace key. Each keypad entry must be preceded by selection of the type of quantity to
be entered and followed by selection of the desired units or the ENTER key.
The first key pressed on the keypad causes the PMC to display ENTRY=X where X represents the
key depressed. Succeeding keys as depressed will add to the displayed number.
The decimal point may be placed in any position except after the last digit; i.e. there must be at
least one character following the decimal point if a decimal point is entered. The minus/backspace
key when used as the first entry negates the entered number. At all other times the
minus/backspace key erases the single preceding entry. Successive presses of the backspace key
continue to erase preceding entries until the first entry is gone.
If the PMC is in Operate mode and the value entered is within the present operating range (See
Table 1.1) the output signal will change to the new output setting. If the PMC is in Operate mode
and the value entered is out of the present operating range (See Table 1.1) the PMC will return to
Standby mode.
2.4.3 Display
The PMC has a multi-purpose 20 character alphanumeric vacuum fluorescent display. The intent
of the display and the LED indicators is to give the operator as much information as possible for
identifying the current PMC status. The individual displayed messages are explained in each
appropriate section.
In general, the display will change in response to any keystroke. In most circumstances the
nomenclature on the key will appear in the appropriate location on the display. Some special
display features should be noted.
A few seconds after the OPER key is depressed, a single character will appear between the type of
quantity being displayed (i.e. voltage or current) and the numerical value. The characters <, =, >
(output status indicator) represent whether the actual output is less than, equal to, or greater than
the desired output. After waiting a few seconds for the output to settle the equal sign should be
displayed.
If the desired value is modified or the output load is drastically changed the output status indicator
may momentarily revert to < or >. Once the PMC is placed in Standby the output status indicator
will disappear.
One other display feature is the blinking numeric value, which indicates the value has been
modified below the specified limit of the present operating range. The PMC will attempt to output
the requested value, however the output is not guaranteed to meet specifications. The display will
also blink if the entered value is less than the lower limit of the lowest range.
2.4.4 Reset
The RESET function automatically occurs upon completion of the Function Test, or may be
manually applied at any time by pressing the RESET key. This function removes all outputs and
sets all voltage, current and phase values to zero. The display will read “DC, 60 Hz or 400 Hz?”
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