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6–7 Detection of Abnormal Pulse Outputs
The Position Control Unit outputs pulse trains in accordance with the pro-
grammed data. When tracing an abnormality, the following should be taken
into consideration.
The Unit only outputs the number of pulses required to reach the target posi-
tion. Count the number of pulses being output with an up/down counter and
check to see if the proper number of pulses is being output.
The frequency of pulse train output can be observed on a synchroscope at
the constant speed interval of the trapezoidal acceleration/deceleration. To
measure the frequency during acceleration and deceleration, an F/V conver-
ter and X-Y recorder can be used. For regular maintenance, observation of
the frequency at stable speed intervals with a synchroscope is sufficient.
Trapezoidal acceleration/deceleration
X-Y recorder
Time (s)
Acceleration/decelera-
tion (measured with an
F/V converter and an
X-Y recorder).
(measured on a synchroscope)
Constant speed interval frequency
Frequency f
(pps)
Shaded area: Number of pulses (measured with an up/down counter)
Position Control Unit
Pulse train
output
F/V converter
Number of Pulses in Pulse
Train
Frequency of
Pulse Train Output
Detection of Abnormal Pulse Outputs Section 6–7
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