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CHAPTER 2: POWER REQUIREMENTS
230 V AC, 3-Phase Wye System (Single Line)
Line-Neutral-Earth/Ground
Figure 9 illustrates a basic 230 V AC, 3-phase Wye distribu-
tion system with the loudspeaker load distributed across all
three phases, with each loudspeaker connected to a single
line and common neutral and earth/ground lines. This sys-
tem delivers 230 V AC to each loudspeaker.
Loudspeaker
(230 V AC)
Line 1 (230 V AC)
Line 2 (230 V AC)
Line 3 (230 V AC)
Neutral
Earth/Ground
Figure 9: 230 V AC, 3-Phase Wye System (Single Line to Loudspeakers)
CAUTION:
For 230 V AC 3-phase systems,
never use a Delta connection. Connecting two
lines to the AC input of the 750-LFC 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 con-
nectors, one for AC Input (blue) and one for AC Loop Output
(gray).
AC Input (Left) and AC Loop Output (Right) Connectors
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 dis-
connections. A 10-foot AC power cable, rated at 15 A, is
included with each loudspeaker. If you replace the included
AC power cable, make sure to use a cable with the appropri-
ate power plug (on the other end) for the area in which you
will operate the unit. The 750-LFC requires a grounded out-
let. To operate safely and effectively, it is extremely import-
ant that the entire system be properly grounded.
10
Loudspeaker
Loudspeaker
(230 V AC)
(230 V AC)
The AC Input connector also supplies power to any addi-
tional loudspeakers connected to the loudspeaker's gray
Loop Output connector.
CAUTION:
When looping AC power for loud-
speakers, 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 loud-
speaker (see Table 1 on page 10).
AC Loop Output (Gray)
The gray AC Loop Output connector allows multiple
750-LFCs 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 discon-
nections. For applications that require multiple 750-LFCs,
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 loud-
speaker.
Table 1: Maximum 750-LFCs that Can Be Looped with AC Power
Circuit Breaker/
115 V AC
Connector Rating
1 looped
15 A
(2 total)
2 looped
20 A
(3 total)
NOTE:
Current draw for the 750-LFC is
dynamic and fluctuates as operating levels
change. The indicated number of loudspeakers that
can be looped assumes that operating levels are nor-
mal and not such that loudspeakers are constantly
limiting.
The 750-LFC 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 (P.N. 28.115.032.03): 3.2 ft (1 m), 13 AWG (2.5 mm
230 V AC
100 V AC
4 looped
1 looped
(5 total)
(2 total)
6 looped
2 looped
(7 total)
(3 total)
2
).
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