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Technical Manual
FT420
– Iss 2.4
44
3.7.6 MDH outputs
The connection for an MDH output is shown in Figure 20.
POWER
SUPPLY
MDH UNITS
MDH IN
MDH OUT
-
+
-
+
CIE
IF FT420 PSU IS USED
TO DC INPUT
IN SUB880
5A
Diode
Figure 20 Typical MDH Output Circuit
Separate power supply is recommended to provide 24V supply to the magnetic door holders. If the
power supply requirement is calculated correctly, FT420 power supply can be used to provide power
to the door holders and must be connected as shown in Figure 20. A 5 Amp diode must be added as
shown in the drawing to isolate the batteries from back feeding power to the door holders.
3.8 Internal Connections
3.8.1 Panel Mounted MCP
Every FT420 CIE is supplied with a panel mounted manual call point (MCP). The MCP is connected to
the main control board via dedicated MCP terminals. This MCP input is fully supervised and requires
3.9K
Ω EOL resistor as shown in Figure 21.
+
-
CIE
MCP
EOL
3K9
Figure 21 MCP Circuit
3.8.2 Optional External Buzzer
FT420 has a PCB-mounted buzzer on the Main Display Driver board that meets the buzzer sound
level requirement of 65dB at 1 metre. If the sound level of 85dB at 1 metre is required, an external
buzzer can be installed to the CIE front plate and wired as shown Figure 22, in this case, the PCB-
mounted buzzer must be removed.
Figure 22 External Buzzer Circuit
+
-
Содержание Firetracker FT420
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