Mitsubishi HD-5000A Spezifikationen PDF herunterladen (Seite 116)

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NEMA 13

Enclosures are intended for indoor use primarily to provide a degree

of protection against dust, spraying of water, oil and non-corrosive

coolants.



When the signal is taken directly off the collector element of the

output transistor, no Pull-Up is used. This is the electronic equivalent

of a mechanical switch closure to common. The input device of the

PLC or counter is effectively placed in a series circuit that includes the

output transistor and input device, which is often an opto-isolator and

the positive voltage supply. When the output transistor turns on, the

circuit is completed and current will flow. The output signal cannot be

observed unless the circuit is completed externally.



In the low or logic 0 state, it is in the quiescent state. It goes high

or logic 1 when activated. This is a transition in the “positive going”

direction.



A tuberous root credited with generating as much fame for the state of

Idaho as their encoder prowess.



Number of pulses occurring in one revolution of the encoder shaft.



Either positive going or negative going. A pulse has two logic states:

activated or inactivated. These two states are opposite. When the

pulse is in its quiescent state (high or low), it is at one particular logic

level (1 or 0). When the pulse hits or is in the activated state, this logic

level reverses itself for the duration of the pulse.



The actual real time between the leading and trailing edge of a pulse.

The pulse width of the output signal of most encoders is a 50% duty

cycle on the clock outputs. Some models utilize a timed or “one shot”

output. This provides a constant pulse width irrespective of the pulse

repetition rate or shaft speed. The factors to be considered when

determining pulse width specifications are: (1.) What is the minimum

pulse width requirement of the counter or PLC? This information is

available in the counter or PLC specifications. (2.) Pulse repetition rate

versus pulse width. With a constant pulse width, the individual pulses

become closer together as the pulse repetition rate or shaft speed

increases. At some point the pulses will overlap and the output signal

as a series of well defined pulses ceases. The pulse repetition rate

varies inversely with the pulse width and vice versa.



When added inside the encoder between the positive voltage and

the collector element of the output transistor, it becomes a “pull-up”

circuit. This is also know as a pulse output.



An output circuit that will both sink and source current.



A dual output encoder used for bi-directional motion control. One

channel leads the other by 90° electrical. By monitoring the phase

shift of both channel A and B, direction can be determined. Another

benefit of a quadrature encoder is count multiplication. With an

appropriate counter, resolution can be multiplied up to four times.

For instance, using this technique an encoder with CPR of 1000 can

provide a resolution of up to 4000 pulses per shaft revolution.



Quadrature error is the phase error when the specified phase

relationship between two channels is nominally 90° electrical.



The force applied at a specific point to the encoder shaft perpendicular

to the axis of rotation.



The maximum force that may be applied perpendicularly to the shaft

without reducing the rated operating life or causing deviation from the

rated performance.



The number of increments on the encoder disk. For incremental

encoders, resolution is defined as cycles per revolution.



Amount of shaft movement while spinning.



A single channel encoder produces one incremental output. They are

often used for tachometry applications.



Running torque is the rotary force required to keep an encoder shaft

turning. It is typically expressed in oz-in.



Starting (breakaway) torque is the rotary force required to overcome

static friction and cause the encoder shaft to begin rotating.



An encoder that generates a single stream of pulse counts regardless

of direction of shaft rotation. Unidirectional encoders are not capable

of determining direction of shaft rotation.

C

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Technical Information

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