Crowcon Gasflag Petunjuk Pemasangan, Pengoperasian, dan Pemeliharaan untuk Pemasang dan Pengguna - Halaman 5
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The Gasflag alarms can be configured to operate as LATCHED or
NON-LATCHED. When an alarm level is exceeded and has been
configured as LATCHED, the alarm relay will switch state and remain in
that state until the control panel is reset even if the gas level falls to normal
values. A NON-LATCHED alarm relay will switch state when the alarm
level is exceeded but will return to normal if the gas level returns to normal.
LINKS 16 and 18 set the Gasflag configuration for ALARM 1 and 2, the
links should be set to A for NON-LATCHING or B for LATCHING.
3.2.2 Alarm and fault relay settings
The fault relay will change state if the current level in the detector loop
drops below 3 mA or rises above 23.5 mA. The relays can be configured
to work as NORMAL (de-energised) or FAILSAFE (energised). Typical
configuration is to set ALARM 1 and 2 as NORMAL (LINKS 12 and 13 to
A) and FAULT as FAILSAFE (LINK 14 to B).
When configuring these settings please ensure that local
regulations and site procedures are followed.
3.2.3 Alarm buzzer settings
The Gasflag control panel default setting for the BUZZER is ENABLED.
The BUZZER can be disabled using LINK 11. Set this link to A to enable
the BUZZER and to B to disable the BUZZER.
The BUZZER is typically disabled if external alarm devices are added.
3.3 Remote alarm devices
Audible and visual alarm devices can be connected to the Gasflag control
panel from the screw terminal blocks marked ALARM 1, ALARM 2 and
FAULT on the RELAY PCB.
Crowcon can provide a wide range of alarms and indicators for operation
in safe and hazardous areas.
Contact Crowcon for further details of suitable devices.
3.3.4 Power to an external alarm device through the alarm
relay
The Gasflag control panel can be used to provide the power supply for an
external alarm device. "Figure 3.1" shows the electrical connections
required.
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