Dräger PointGard 2000 Series, Инструкция по эксплуатации

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22 Instructions for use |
Dräger PointGard 2000 Series
en
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Instrument settings
11.6 Combinations of latching and alarm
acknowledgment
The following examples give an overview of relay
acknowledgment combinations.
Latching and non-latching signals are not time-limited.
Latching signals stay active until they are acknowledged.
Non-latching signals stop as soon as the triggering condition
clears.
11.7 Relays
With factory default settings and during normal operation, the
relays are energized. This provides a “fail-safe” operation.
For PointGard instruments the setting Normally energ. must
not be changed to Energ. on alarm , otherwise the built-in
alarm devices (horn and strobes) are triggered!
11.7.1 Configuring relay A1 or A2
This function defines whether the alarm relay is energized
during normal operation or energized at an alarm condition.
1. Select
Settings > Instrument > Alarm > Relay A1 or
Relay A2 and confirm.
2. Select the desired option and confirm.
11.7.2 Setting fault relay warm-up 1
This function is used to set operation of the fault relay during
warm-up 1 to indicate the warm-up 1 state on the relay output.
1. Select
Settings > Instrument > Alarm > Fault warm up
the desired option and confirm.
11.8 Alarm configuration
All alarm settings have influence on the relays, the analog
interface, and the built-in alarm devices.
11.8.1 Switching the alarms on or off
1. Select Settings > Instrument > Alarm > Alarm on/off .
2. Select Enable or Disable and confirm.
11.8.2 Configuring alarms
1. Select Settings > Instrument > Alarm > Alarm A1 or
Alarm A2 and confirm.
The current alarm threshold is displayed.
2. Apply settings and confirm the configuration steps
successively with Next .
a. Set value for alarm threshold.
b. Set alarm direction.
c. Set latching mode.
Latching
(Manual relay reset)
Non-Latching
(Automatic relay
reset after alarm
condition cleared)
Acknowledge-
able
Relay reset possible at any time.
Non-acknowl-
edgeable
Relay reset not possible before alarm con-
dition cleared.
Pre-acknowl-
edgeable
Alarm acknowledgment possible before the
alarm condition cleared. The relay resets
automatically after the alarm condition
cleared.
Normally
energized
The relay contact is energized during nor-
mal operation and changes if an alarm is
triggered. At a loss of power this triggers an
alarm (fail-safe).
Energ. on
alarm
If an alarm is triggered, the relay contact is
energized.
static The fault relay triggers a connected alarm
indicator permanently.
The orange LED is lit continuously.
dynamic The fault relay switches state for 9 seconds.
Example:
– A horn is connected to fault relay output
Normally Open.
– Relays are configured as normally ener-
gized.

The horn and the orange LED of the
transmitter are 1 second active and 9
seconds in-active.
Enable Alarm signaling is on.
Disable Alarm signaling is off.
LEDs, relays and interfaces
do not indicate an alarm con-
dition.
The 4-20mA interface trans-
mits the maintenance signal.
The measured value and the
symbol are displayed.
The fault relay indicates a
fault.
Rising The alarm direction is called rising, if the
gas concentration has to exceed a certain
value to activate an alarm.
Falling The alarm direction is called falling, if the
gas concentration has to fall below a certain
value to activate an alarm.
Latching Once the alarm threshold is reached, the
instrument will trigger the alarm. It will
remain in alarm status even if the gas con-
centration does not meet the alarm condi-
tion any more. To clear a latching alarm it
has to be acknowledged.