Precision Digital Corporation PD6622-L2N, Инструкция по эксплуатации

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Loop Leader PD6620 Series Loop-Powered Flow Rate/Totalizers Instruction Manual
24
Alarm (
ALARM
)
Alarm outputs may be assigned to the rate, total,
grand total, or the digital input. When assigned to the
rate, the alarm may be set as either a high alarm or a
low alarm. Alarm actions (
AUTO
,
AUTO.MAN
,
LATCH
,
L-CLEAR
) determine how and when the alarm should
be reset. They operate as follows:
•
Automatic (
AUTO
): Alarm will reset
automatically once the alarm condition has
cleared.
•
Automatic/Manual (
AUTO.MAN
): Alarm will
reset automatically once the alarm condition
has cleared but can also be reset using the
Enter (ACK) button (or whichever function
key is set to acknowledge) at any time.
•
Latching (
LATCH
): Alarm must be reset
manually and can be done so at any time.
Press the
Enter
(ACK) button at any time to
clear the alarm.
• Latching with Reset after Clear (
L-CLEAR
):
Alarm must be reset manually and can only
be done so after the alarm condition has
cleared. Press the
Enter
(ACK) button after
the alarm condition has cleared to reset the
alarm.
If the alarm is set to rate, a set and reset point must
be programmed. The set point is the display value at
which the alarm will turn on and the reset point is the
display value at which the alarm will turn off. If the set
point is lower than the reset point, the alarm will be a
low alarm; if the set point is higher than the reset
point, the alarm will be a high alarm. The digital input
alarm will trigger whenever the digital input is
triggered.
For both the rate and digital input alarms, a delay
before the alarm is turned on or off may be set, as
well as a fail-safe feature which reverses the on/off
operation of the open collectors.
Alarm states will be displayed on the meter even if no
open collector output is physically connected. These
may include a red LED backlight, flashing the rate
value (rate alarm only), and a programmable alarm
message. In addition, for meters without a bargraph
an alarm indicator (!) will also display.
Flashing Red Alarm (
RED
)
The last two lines in the preceding menu flow chart
show how to program the display to turn red, flash,
and display a message when an alarm occurs.
Alarm 1 is High Alarm: Alarm 2 is Low Alarm:
OUT 1
ALARM
ALARM
RATE
ALARM
D.INPUT
ALARM
ACTION
ACTN
AUTO
ACTN
AUTO.MAN
ACTN
LATCH
ACTN
L-CLEAR
SET
+00,040.00
SET
GAL/S
Flashes
Units
ALARM
RESET
ALARM
SET
RESET
+00,030.00
ALARM
DELAY
DELAY
ON
TIME
0000 SEC
DELAY
OFF
TIME
0000 SEC
ALARM
FAILSAFE
PV Alarm Only
FSAFE
OFF
ALARM
DISPLAY
RED
ON
FLASH
ON
PV Alarm Only
MSG
ON
MSG
ALARM 1