Programming Confirmation
To verify that the alarm set and reset points have been programmed
as desired, push ENTER, and push ENTER again when ALArS
appears. Before the display stops flashing #1 set point value, push
ENTER again to advance the display to #1 reset point. Continue
skipping through the remaining alarm set and reset points. To alter an
alarm point value, wait for the first digit to flash and program the
desired value using the
Five Basic Digit/Display-setting Instructions
on
page 19.
Alarm Operation
When the meter detects an alarm, a front panel LED illuminates to
indicate which alarm point has tripped. This LED will stay illuminated
until the meter display passes through the reset point.
Set Relays for Fail-Safe Operation
In the fail-safe mode, the relay coils are
energized
and the Normally
Open (NO) contacts are connected to the Common (C) contacts under
normal operation. During an alarm condition the relay coils are
de-
energized
and the Normally Closed (NC) contacts are connected to the
Common (C) contacts. During a power failure the relay contacts
reflect an alarm condition.
Removing jumper JP6 disables the fail-safe operation. Jumper JP6 is
located on the Display Board, see Figure 14 on page 29. If fail-safe
mode is disabled, the operation of the relay contacts is opposite to
the one described in the previous paragraph.
Model PD690 Universal Process Meter Instruction Manual
28
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