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Input
Speed should not exceed 2,000 RPM. There
is no minimum, but as input speeds approach zero, slight variations
in the angular velocity of the output become noticeable.
It is much
better to use higher input speeds and take as much reduction as
possible from the output shaft to maximize precise speed control.
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Direction
of the input does not affect direction of output but does affect
the speed range and performance of the Zero-Max Drive.
The recommended
input rotation direction in relation to output is given below. If
output speeds are substantially in excess of rated speeds or if
the drive is noisy or vibrating at top speed, the non-preferred
direction input is probably being used. Try reversing the motor
so the input is in the other direction.
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Output
Speed is infinitely adjustable from 0
to 1/4th of the input speed. Speeds can be maintained or repeated
with accuracy of 1% or less of maximum speed in the upper 90% of
the range providing output load and input speed are constant. Zero-Max
Drives models vary in their ability to give absolute zero under
light loads. All models go to zero output speed under full load.
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Output
Torque ratings listed for various models
are constant throughout the speed range and assume an input speed
of 1800 RPM. The drives are designed for continuous duty running
at one speed, a wide variety of speeds, or can be continuously cycled.
Additional output torque may be gained by lowering input speed.
In general, the torque rating of all models may be increased 25%
if the input speed is 900 RPM or lower.
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Temperature
rise of 40° C. above ambient may be expected in the drive assuming
input speed of 1800 RPM. This temperature will generate surface
heat too hot for continued skin contact. This does not indicate
a malfunction nor does it affect the performance of the drive. The
drives are built to withstand high operating temperatures but they
should never exceed 90° C.
Zero-Max Drives are very quiet in operation. Motors and gearheads
add to the noise level. For very quiet operating environments, use
a resilient mount motor coupled to the drive and provide a resilient
mounting surface for all components.
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Overload
Protection is provided in unidirectional
E and JK Models. The breakage protector is not meant to be used
as a continuous slip clutch. The torque at which the breakage
protector disconnects is substantially higher than the rating
of the drive at low speeds. It is, therefore, possible to exceed
the rated load of the drive without activating the breakage protector
and cause shortened life.
As with all
mechanical equipment, care should be taken when starting the Zero-Max
under load. Whenever possible, accelerate the load slowly from
zero and in the case of reversible drives, bring the output speed
to zero before reversing the direction of output.
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