6
CHAPTER 2
The blue input connector serves as the input for all the units
looped in that circuit and is rated at 20 amps maximum.
Please make sure never to exceed 20 amps on any single
connector. Refer to Table 2.1.
Table 2.1: Maximum looping capabilities for MJF-212A
Circuit Breaker/
Connector Rating
115 V AC 230 V AC 100 V AC
15 amps 2 Looped-out
(3 total)
5 Looped-out
(6 total)
1 Looped-out
(2 total)
20 amps 3 Looped-out
(4 total)
7 Looped-out
(8 total)
2 Looped-out
(3 total)
CAUTION: Do not exceed the current
capability of the 20-amp MJF-212A
loudspeaker AC connector. When looping always
take into account the current draw of all the
speakers in the circuit, including the first unit.
NOTE: For best performance, the AC cable
voltage drop should not exceed 10 volts, or
10 percent at 115 volts and 5 percent at 230 volts.
POwER CONNECTOR wIRING CONVENTIONS
The MJF-212A monitor requires a grounded outlet. Use the
AC cable wiring diagram below (Figure 2.3) to create power
connectors.
Figure 2.3. AC cable color code
If the colors referred to in the diagrams don’t correspond to
the terminals in your plug, use the following guidelines:
 Connect the blue wire to the terminal marked with an N
or colored black.
 Connect the brown wire to the terminal marked with an
L or colored red.
 Connect the green and yellow wire to the terminal
marked with an E or colored green or green and yellow.
NOTE: For units shipped with the VEAM
all-in-one multipin connector, please refer to
Appendix A for AC Power pin-out.
CAUTION: When creating AC cables
and distribution systems, it is important
to preserve AC line polarity and connect earth
ground on both sides of the cable. MJF-212A
monitors require a ground connection. Always use
a grounded outlet and plug. It is very important that
the system be properly grounded in order to operate
safely and properly. Do not ground-lift the AC cable.
VOlTAGE REqUIREmENTS
When AC power is applied to the MJF-212A stage monitor,
the Intelligent AC power supply automatically selects the
correct operating voltage, allowing the unit to be used
internationally without manually setting voltage switches
or jumpers. In addition to selecting the operating voltage,
the Intelligent AC power supply performs the following
protective functions to compensate for hostile conditions on
the AC mains:
 Suppresses high-voltage transients up to several
kilovolts
 Filters common mode and differential mode radio
frequencies (EMI)
 Sustains operation temporarily during low-voltage
periods
 Provides soft-start power-up, eliminating high inrush
current
The MJF-212A stage monitor operates safely and without
audio discontinuity if the AC voltage stays within either of
two operating windows at 50 or 60 Hz:
 85 to 134 volts
 165 to 264 volts
The MJF-212A can withstand continuous voltages up to
275 volts and allows any combination of voltage to GND
(that is neutral-line-ground or line-line-ground).
CAUTION: Continuous voltages higher than
275 volts can damage the unit.