AC power 9
AC power
DANGER! Read “Safety Information” on page 3 before connecting the MAC TW1 to AC
power.
Important! Before applying power to the MAC TW1, make sure that the lamp voltage rating
exactly matches the output voltage of the internal or external dimming system used, or
damage can be caused that is not covered by the product warranty. See “Dimming options
and lamp voltage” on page 12 for full details.
Although the lamp can be supplied with power using an external dimming system if
required, the main power input of the MAC TW1 must be connected directly to AC power.
Do not use an external dimming system to supply power to the fixture via the main power
input, or you may obtain irregular light output and cause damage the fixture that is not
covered by the product warranty.
Power voltage and main fuses
DANGER! Replace fuses with ones of the same type and rating only.
The MAC TW1 features an auto-sensing switch-mode power supply that automatically adapts to 100-120 V
and 200-240 V nominal AC power at 50 or 60 Hz.
Note that power to the lamp is supplied at the output voltage from the dimmer. If using a multi-voltage IGBT
internal dimmer, the output voltage from the dimmer is the same as the input voltage to the fixture and the
lamp must therefore be rated at the AC power voltage the fixture is connected to. See “Dimming options and
lamp voltage” on page 12 for full details. Check the lamp voltage rating before applying power. Damage
caused by using an incorrectly rated lamp is not covered by the product warranty.
Power circuits are protected by two 20 amp main fuses, one on the live and one on the neutral conductor
The fuses are located on a PCB in the base. The external dimmer lamp power circuit is likewise protected
by two 20 amp fuses on a PCB in the base. See “Fuse replacement” on page 26 for details of accessing and
changing fuses.
Power connection
DANGER! For protection from electric shock, the fixture must be grounded (earthed). The
AC mains supply must be fitted with a fuse or circuit breaker and ground-fault (earth-fault)
protection. Check that the correct fuses are installed before applying power.
You may need to fit the power cable with a power plug that is suitable for your AC power outlets. If so, install
a grounding-type (earthed) plug that is correctly rated for the current and power requirements of the fixture.
Follow the plug manufacturer’s instructions. Table 1 shows some possible pin identification schemes; if pins
are not clearly identified, or if you have any doubts about proper installation, consult a qualified electrician.
To apply power, first check that the head tilt locks are released and then set the power switch on the base to
the “I” position.
Wire Color Pin Symbol Screw (US)
brown live L yellow or brass
blue neutral N silver
yellow/green ground (earth) green
Table 1: Power plug connections
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