Operation - MEDC DB3L Technisches Handbuch

Wiring options
The unit is available in six basic configurations:
1. Exd - DC Input, single tone
2. Exde - DC input, single tone
3. Exd - DC input, dual tone
4. Exde - DC input, dual tone
5. Exd - AC input, single tone
6. Exde - AC input, single tone
Types 1 & 2 have 6 terminals labelled as T1 to T6. The supply should be connected to T1 (+ve), T3 (-ve), loop out
on T4 & T6 respectively
Types 3 & 4 have 6 terminals labelled as T1 to T6:
For a 2 wire system, the supply should be connected to T1 (+ve), T2 (-ve), loop out on T4 & T5 respectively to
produce tone 1. Tone2 is produced when the polarity of the supply is reversed T1 (-ve), T2 (+ve), loop out on T4 &
T5 respectively. Optionally an EOL resistor may be connected to T4, T5.
For a 3 wire system, the supply should be connected to T1 (common +ve), T2 (-ve 1) & T3 (-ve 2), loop out on T4,
T5 & T6 respectively. Tone 1 is produced when the supply is connected to T1 (Common +ve) & T2 (-ve 1). Tone 2 us
produced when the supply is connected to T1 (common +ve) & T3 (-ve 2). Optionally an EOL resistor can be
connected to T4, T5 or T4, T6.
Type 5 has 4 terminals labelled as L, L, N, N. The supply should be connected to one L,N pair of terminals, loop out
on the second L,N pair of terminals
Type 6 has 6 terminals labelled as T1 to T6. The supply should be connected to T1 (L), T2 (N), loop out on T4 & T5
respectively.

3.0 OPERATION

The sounder is available in various AC input voltage versions and a single DC voltage input version.
For AC versions, the nominal operating voltage is stated on the unit label and the supply voltage tolerance is ±10%
For DC versions, the absolute input voltage range is 11.0Vdc to 58.0Vdc
The DC version can be operated as a dual-tone unit (if specified when ordering). The unit can be switched between
the two tones by either:-
a. Reversing the polarity of the supply (2 wire versions)
b. Connecting as a 3 wire common +ve system and switching between the two -ve lines.
Note: - with T1 (+ve), T2 (-ve) tone 1 is produced (as set by DIL switch 'TONE 1')
- with T1 (+ve) T3 (-ve) or T1 (-ve), T2 (+ve) tone 2 is produced (as set by DIL switch 'TONE 2')
The unit is fitted with a volume control which is positioned adjacent to the DIL switches on dc units and is mounted
on the transformer on ac units. Maximum volume is obtained when this control is turned fully clockwise.Minimum
volume is obtained when this control is turned fully anticlockwise.
WARNING: Do not attempt to turn the volume control past its limits of movement as this may cause damage to the
unit.
07/14 © MEDC 2014