MEDC PAS1 - Manual (Page 5)

3. operatIon
3.1 The unit is initiated directly from the power source.
The DB1P & DB1HP units include two 5-way DIL switches to select any two
tones from the list. Use SW2 to select tone 1 & SW1 to select tone 2.
3.2 Single Stage Alarm (d.c. version only)
To operate as a single stage alarm, set the appropriate tone using SW1 and
connect input wires to TB1 (+ve) (red) and TB5 (–ve) (blue). Loop in and loop
out is then TB2 and TB6.
To operate in supervisory mode, reverse the voltage between TB1 and TB5
(such that TB1 is -ve and TB5 +ve).
Note that there is a diode mounted on the PCB which will inhibit the operation
of the sounder in the supervisory (reverse voltage) mode.
3.3 Two Stage alarm (d.c. version only)
To operate as a two stage alarm, set the required tones using SW2 for tone 1
and SW1 for tone 2.
3.3.1 Reverse Polarity Set Up
Connect input wires to TB1 (+ve) (red) and TB3 (–ve) (black), tone 1
will sound. Reverse the voltage so that TB3 is +ve and TB1 is –ve, tone
2 will sound.
3.3.2 Common +ve Set Up
Connect input wires to TB1 (+ve) and separate –ve’s to TB3 and TB5.
When TB3 is –ve tone 1 will sound, when TB5 is –ve tone 2 will sound.
3.4 Single Stage Alarm (a.c. version)
When the unit is powered with a.c. only a single stage alarm is available.
Tones should be selected using SW1. Connect input wires between TB1 and
TB3.
Note: In all set ups, loop in and loop out is facilitated by TB2, TB4 and TB6 as
appropriate.
4. maIntenance
During the working life of the unit, little or no maintenance is required. However,
if abnormal or unusual environmental conditions occur due to plant damage or
accident etc., then visual inspection is recommended.
If a fault should occur, it is recommended that the unit be returned to MEDC for
repair. All parts are replaceable.
If you have acquired a significant quantity of units, it is recommended that spares
are also made available. Please discuss your requirements with the Technical
Sales Engineers at MEDC.
© MEDC 2003 02/10