Detcon 210A-FB - Manual (Page 2)

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1.1 DESCRIPTION
switch, an alarm disable switch and a line power fuse.
Discreet output terminal strips located on the controller
mother board are provided for sensor terminations,
Form C dry contact alarm outputs, 4-20ma outputs
for remote recording devices, AC power in, DC power
in, remote reset as well as relay logic and power
terminations for the multiple alarm relay circuit. Form
C relay outputs may be discreet, zoned or common
by gold plated jumper tabs located on the controller
mother board. Form C dry contacts; common,
normally open and normally closed, are provided for
3 alarms; High, Low and Fault. Contacts are rated at
.6 amp @125 VAC / 2 amp @ 30 VDC. When used
in conjunction with the multiple alarm relay circuit (part
#5026), contacts are rated 8 amp @ 117 VAC / 5 amp
@ 30 VDC. Detcon Model 210A-FB control enclosure is a
NEMA 4X molded fiberglass case with hinged,
gasketed door and is designed for surface mounting
in both indoor and outdoor locations. An unbreakable
glass view window is gasket mounted in the door.
The NEMA 4X rating is by definition raintight and
therefore suitable for outdoor location in electrically
non-hazardous environments.
The control enclosure houses the mainframe
hardware compatible with Detcon Model Series 10A
digital electronic controls. Model 210A-FB system
capacity is up to 2 channels consisting of remote
mounted area sensors and single channel electronic
controls (Detcon Model 10A). The system is powered
by AC line power and/or 24 VDC unless otherwise
specified at time of order.
The control enclosure includes, as standard
operating controls (DWG #786.27A); a power on/off
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1.2 MUTIPLE ALARM RELAY CIRCUIT
A multiple alarm relay circuit (DWG #377.01A)
mounted on the controller mother board is provided
with each Detcon Model 210A-FB. The alarm circuit
consists of 4 interposing relays (contacts are rated
8 amp @ 117 VAC / 5 amp @ 30 VDC) with 24VDC
coils as standard. Other coil voltage ratings must be
specified at time of order. The alarm circuit can be
configured to ouput Form C dry contacts (common,
normally open and normally closed), AC power or
DC power. A 5 amp microfuse is provided for each
relay and is configured in series with the common
pole of its respective relay. This configuration is
functional regardless of whether Form C dry contacts,
AC power or DC power outputs are used.
An In/Out termination is provided for applying AC
or DC power into any one of the interposing relays.
A gold plated jumper tab is used to apply the in/out
power option to its corresponding relay, thus the 4
relays may be used in a combination of Form C dry
contacts and VDC outputs or Form C contacts and
VAC outputs.
The terminations labled "Alarm Coil Power" located
to the left of the alarm circuit are used only for coil
power. The "+" termination may be used to provide for various relay logic through the Form C dry
contacts of each individual Model 10A channel located
on the controller mother board directly above the
alarm circuit card. The "-" termination should be wired
into the common termination (shown by a common
symbol) located on the left of the alarm circuit board.
The terminations labled "Alarm Power" located to
the far left of the unit are used for providing power to
the In/Out termination on the alarm circuit card. As
can be seen in the 210A-FB schematic / wiring
diagram (DWG #730.01A), the alarm power
terminations for AC come directly from the AC input
terminals located above on the controller mother
board. The same is true of the DC power
terminations. Note: DC power used to drive alarms
must be obtained through a remote DC power source.
The remote DC power source should be terminated
to the terminals labled "DC IN" located on the
controller mother board. The "DC IN" terminations
function as both an alternative DC source used to
power the 210A-FB as well as provide power for DC
alarms. The 210A-FB power supply is not capable of
providing power for alarm devices.
Detcon Model 210A-FB Gas Detection System PG.2
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1.3 ALARM DISABLE
The alarm disable switch, located on the front
panel, operates by removing DC common from the
"Alarm Coil Power" terminals. Disabling of alarms does not inhibit any function of the Model 10A
digital control module. The digital display, alarm
LED's and on board alarm relays remain active.