3.4.3 Start-up Fuses
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The circuit breaker has an automatic reset feature. If the breaker trips, it will reset within
a few minutes and the unit can be restarted. If the unit trips again after a short time, the
trip current may be set incorrectly.
Circuit breaker
3.4.3 Start-up Fuses
The start-up transformer and associated circuitry are energized whenever the power
is connected. To protect this circuitry, two 2 A, class CC time-delay fuses are provided.
A fuse is accessed by pulling open the access door on the fuse holder. The fuses are
inserted small-end first as shown in FIGURE 3-4.
Fuses being inserted into the fuse holder:
3.4.4 Cable Entry
A 38 mm (1.5 in) diameter hole is provided for the power wiring to enter the unit.
Wiring must be approved by your local electrical product safety agency and be sized
appropriately to accommodate both the configured working voltage and maximum
current draw. A strain relief busing must be used in installation. Two different
compression grommets and slip washers are provided. The first, a yellow slip washer
and its corresponding grommet, are provided in the Model 648 installation kit and
are provided assembled inside the bushing body. It will accommodate a 15.9 mm to
19.0 mm (0.63 in to 0.75 in) round neoprene jacketed cable. The second, a purple slip
washer and its corresponding grommet, are provided in the Model 648 installation
kit as well, bagged separately from the bushing body. It will accommodate a 19.0 mm
to 22.2 mm (0.75 in to 0.88 in) round neoprene jacketed cable. If either of the
bushings provided will not work with your cable, a strain relief of the appropriate type
and size must be provided by the installing agency.
To ensure proper operation of the strain relief bushing, it must be tightened to a
torque of 68 Nm (50 ft/lbs). A typical cable entry with bushing is shown in FIGURE 3-5.
FIGURE 3-3
FIGURE 3-4
