750-LFC OPERATING INSTRUCTIONS
14
230 V AC, 3-Phase Wye System (Single Line)
Line-Neutral-Earth/Ground
Figure 10 illustrates a basic 230 V AC, 3-phase Wye
distribution system with the loudspeaker load distributed
across all three phases, each loudspeaker connected to a
single line, and common neutral and earth/ground lines. This
system delivers 230 V AC to each loudspeaker.
CAUTION: For 230 V AC 3-phase systems,
never use a Wye connection. Connecting two
lines to the AC input of the 750-LFC loudspeaker
exceeds the allowable upper voltage range (275 V AC)
and will damage the loudspeaker.
AC CONNECTORS
The 750-LFC user panel includes two powerCON 20
connectors, one for AC Input (blue) and one for AC Loop
Output (gray).
AC Input (Blue)
The blue AC Input connector supplies power to the
750-LFC. The 3-conductor powerCON 20 is rated at 20 A
and uses a locking connector that prevents accidental
disconnections. A 10-foot AC power cable, rated at 15 A, is
included with each loudspeaker. If replacement of the
included AC power cable is necessary, make sure to use a
cable with the appropriate power plug (on the other end) for
the area in which you will operate the unit. The 750-LFC
loudspeaker requires a grounded outlet. To operate safely
and effectively, it is extremely important that the entire
system be properly grounded.
The AC Input connector also supplies power to any
additional loudspeakers connected to the gray Loop Output
connector of the 750-LFC.
CAUTION: When looping AC power for
loudspeakers, do not exceed the current
capability of the AC Input connector (20 A) or
the included AC power cable (15 A). Consider the total
current draw for all loudspeakers on the circuit,
including the first loudspeaker (see Table 1).
AC Loop Output (Gray)
The gray AC Loop Output connector allows multiple
750-LFC loudspeakers to be looped and powered from a
single power source. The 3-conductor powerCON 20 is
rated at 20 A and uses a locking connector that prevents
accidental disconnections. For applications that require
multiple 750-LFC loudspeakers, connect the AC Loop
Output of the first loudspeaker to the AC Input of the second
loudspeaker and so forth.
The maximum number of loudspeakers that can be looped
from the AC Loop Output connector is determined by the
voltage of the power source, the current draw of the looped
loudspeakers, the circuit breaker rating, and the rating of the
AC power cable connected to the first 750-LFC
loudspeaker.
NOTE: Current draw for the 750-LFC
loudspeaker is dynamic and fluctuates as
operating levels change. The indicated number
of loudspeakers that can be looped assumes that
operating levels are normal and not such that
loudspeakers are constantly limiting.
The 750-LFC loudspeaker ships with a gray powerCON 20
cable mount connector, rated at 20 A, for assembling AC
looping cables. Assembled AC looping cables are also
available from Meyer Sound [PN 28.115.032.03: 3.2 ft (1 m),
13 AWG (2.5 mm
2
)].
Figure 10: 230 V AC, 3-Phase Wye System (Single Line to
Loudspeakers)
AC Input (Left) and AC Loop Output (Right) Connectors
Neutral
Earth/Ground
Line 1 (230 V AC)
Line 3 (230 V AC)
Line 2 (230 V AC)
Loudspeaker
(230 V AC)
Loudspeaker
(230 V AC)
Loudspeaker
(230 V AC)
Table 1: Maximum 750-LFCs that Can Be Looped with AC Power
Circuit Breaker/
Connector Rating
115 V AC230 V AC100 V AC
15 A
1 looped
(2 total)
4 looped
(5 total)
1 looped
(2 total)
20 A
2 looped
(3 total)
6 looped
(7 total)
2 looped
(3 total)
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