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ADDA 8F Flag
| 8 WAY LED FLAG UNIT | |
| The ADDA 8-F is a
purpose designed 110 /220 VDC relay based flag unit for panel mounting
purposes. The complete unit is housed in an extruded aluminium
enclosure with removable front engraving plate for easy customization
to the clients requirement. All terminations to the unit are via
locking removable terminals for easy installation and maintenance. The
8 way flag unit consists of eight individual latching relay based
circuits. Each circuit offers the following output functions: 1. Individual potential free contact (only the common of the contact is common to other circuits.) 2. Instantaneous avalanche diode protected trip output for each two grouped alarms (alarms 1,2 - 3,4 - 5,6 - 7,8 are grouped together) 3. Individual double switched trip reinforcing contact (for improved dc load breaking) for each alarm (the common of these contacts are also grouped in pairs as before). 4. Two high brightness LED alarm indicators for each alarm on the front panel. All these alarm output functions are available at the output terminals on the rear of the enclosure , as well as the input and power connections. All the plug-in terminals are of the screw-down locking type, to prevent the plugs from becoming non-'socketed' while in operation and thus invalidating the safety tripping circuits. |
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| Electrical Operation | |
On application of the supply voltage all
alarms will be in the off
condition and all outputs will be de-activated. When an alarm
input (+110/220VDC ) is applied to one of the “fault in” inputs , that
particular alarm will trip. This activates that relevant alarm’s
outputs and illuminates the two LED’s on the front panel. The alarm
will remain in this condition regardless of the input status , until
the main power to the alarm unit is removed (Reset). All the
alarm inputs function in the same manner. (The alarm inputs are
protected against false alarm triggering due to transients and
inductive pickup by means of positive temperature coefficient resistors
in parallel with the input relay coils.) Note
: Engraving of Front Panel is free if
details
are supplied on order, otherwise engraving is R 9-75 per alarm window  |