35
III Status signal: speed reached
Relay energises (transistor output switched) when the current value is above the
switch point
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• If the input frequency decreases again, the relay switches back when the current
value is below the switch point - hysteresis (SP-HY)
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• The relay is de-energised during the start-up delay and as long as the input fre-
quency is smaller than the set switch point
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IV Error signal: overspeed
Relay de-energises (transistor output open) when the current value is above the
switch point
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• If the input frequency decreases again, the relay switches back when the current
value is below the switch point - hysteresis (SP-HY)
�
• The relay is energised during the start-up delay and as long as the input frequency
is smaller than the set switch point
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Switching function in combination with switch point, hysteresis and start-up delay (→ 7.5
Switching diagram)
7.2 Switch point (SP)
Value at which the output changes its switching status according to the switching function
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Value
according to the marking on the device, e
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g
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0
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1
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10 Hz or 10
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1000 Hz
(depending on the potentiometer position SPx1/SPx100)
7.3 Hysteresis
The hysteresis value determines the difference between the reset point and the switch
point SP
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If the distance between cams is not the same, different pulse sequence times are
measured
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They may be alternately above or below the switch point so that the output
changes its switching status continuously and rapidly
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This behaviour can be prevented by
increasing the hysteresis factor
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Value
1
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100 %
UK
Содержание AR003
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