Wacker Neuson HI750 Series, Operator'S Manual, Page: 66 / 144

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Factory-Installed Options HI750
5 Factory-Installed Options
5.1 Variable Frequency Drive (VFD)
Overview The blower motor on your machine requires a surge of electrical current when
starting. This means that the amount of power needed to initially start the motor is
larger than the power required to keep it running. The motor may not start if the
power source does not provide enough current to overcome the surge.
Machines equipped with generators include a Variable Frequency Drive (VFD).
The VFD
(a) allows the motor to start at a low RPM with a gradual increase to full
operating speed. This reduces the amount of current needed to start the motor.
Changing VFD
settings The VFD is factory-set for the motor to reach full operating speed 5 seconds after
startup. Contact your Wacker Neuson representative if there is a need to adjust the
time interval.
5.2 Trailer
Overview Mobile HI750 IDF Heaters are mounted on trailers equipped with electric brakes or
surge brakes, depending on the model selected.
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Electric brakes draw power from the towing vehicle. When the brake pedal is
applied, a magnetic actuator forces the brake shoes against the brake drum to
slow the trailer. A battery-powered breakaway cable is included as a safety
measure to stop the trailer if both the safety chains and coupler fail.
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Surge brakes operate independently of the towing vehicle. When the brake
pedal is applied, centrifugal force actuates a master hydraulic cylinder in the
trailer. Hydraulic fluid then forces the brake shoes against the brake drum to
slow the trailer.
Trailer manual A trailer owner’s manual is provided with the HI750. Read the manual and follow
the manufacturer’s instructions for using, adjusting, maintaining, and storing the
trailer.
Towing safety Read Towing Safety in this Operator’s Manual for additional information about how
to safely tow the HI750 IDF Heater.
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