AB Quality 855H Series Bulletin page 3

STAGE WIRING
DC Units Stage 1 operation:
Connect correct DC input voltage to "+" and "-" as appropriate.
DC Units Second, Third and Fourth Stage Selection
The 855H Recordable Horn uses negative switching to change
the tone to the second, third and fourth stages.
The negative supply must remain
WARNING
connected to the
connection made from this to the
appropriate stage terminal, otherwise
the unit will be damaged.
To activate the second, third or fourth stage tone, connect the
'-' supply line to the relevant stage terminal while maintaining
the DC supply to '+' and '-'.
• For Stage 2 connect '-' to the S2 terminal
• For Stage 3 connect '-' to the S3 terminal
• For Stage 4 connect '-' to the S4 terminal
AC Units Stage 1 operation:
Connect correct AC input voltage to "L" and "N" as appropriate
AC Units Second, Third and Fourth Stage Selection
The 855H Recordable Horn uses Line switching to change the
tone to the second, third and fourth stages.
To activate the second, third or fourth stage tone, connect the
'L' supply line to the relevent stage terminal while maintaining
the AC supply to 'L' and 'N'.
• For Stage 2 connect 'L' to the S2 terminal
• For Stage 3 connect 'L' to the S3 terminal
• For Stage 4 connect 'L' to the S4 terminal
'-' terminal and a
3
Beacon
TERMINALS ON
MAIN PCB
S4S3S2
DC CIRCUIT
WIRING
DIAGRAM
S3
S4
S2
CUSTOMER
SUPPLIED
SWITCHES
Beacon
AC CIRCUIT
WIRING
TERMINALS ON
SUB PCB
DIAGRAM
S4 S3 S2
S4 S3
S2
CUSTOMER
SUPPLIED
SWITCHES
BEACON
PRE-WIRED
INTERNALLY
-
+
See PCB layout on page
5 for actual terminal block
positions
- +
BEACON
PRE-WIRED
INTERNALLY
L N
L
N