Crowcon Crowcon Gasmaster, Installation, Operation And Maintenance Manual, Page: 38 / 48

Menu system overview Crowcon Gasmaster
34
Config channel
Submenu:
Alarm L1 #1 Direction
Values = Rising Rising alarms required where there is normally no gas.
Level 1 alarm Falling Falling alarms required where gas should normally be
relay present (e.g. oxygen).
configuration
for each channel
On threshold
Values = 0.1 to Range Level at which the relay will activate.
(full scale)
Off threshold
Values = 0.1 to L1 On threshold
(rising alarms)
L1 threshold to full
scale - 0.1 (Falling
alarms
Relay type
Values = Latched
Non-latched
Latch accept
Relay drive
Values = De-energised
Energised
Indication
Values = Visible
Hidden
A similar menu is available for Level 2 alarm relays, with the exception that the 'Off Threshold' and
'Indication' options are not available.
Alarm L2 #1* Direction
Threshold
Relay type
Relay drive
* #1 denotes the channel number and therefore may read #2, #3 or #4 on Gasmaster.
Menu Item Values
(as shown on display)
Description
Supervisor menu
(allows system tests to be performed, and configurations to be changed. A pass
cont.
word is required to enter this mode, see section 3.7 for details.)
Press the Up
and Down
buttons to
cycle through
configuration
for channels
#2,#3,#4
Level at which the Level 1 relay will reset. Allows
hysteresis for applications such as ventilation control
where the fan should continue to run until the gas
reaches a low level.
Latched means that in an alarm state, the relay will
stay active when the Accept/Reset button is pressed,
and will only reset when the alarm or fault has
cleared and the Accept/Reset key is pressed again.
Non-latched means that the relay will stay active
when the Accept/Reset key is pressed, but will reset
automatically when the alarm has cleared.
Latch-accept means that in an alarm condition
the relay will reset when the Accept/Reset button
is pressed.
De-energised means that the relay coil is not ener-
gised in a non-alarm state (normally de-energised).
Energised means that the relay coil is energised
in a non-alarm state (normally energised or
'fail-safe')
Visible
means that an alarm will trigger the alarm
LED bar, internal sounder, external audible visual
alarms, and display the alarm message.
Hidden means that an alarm will only cause the
alarm icon in the channel display to show. No
other audible or visual alarms will activate (used for
ventilation control applications)