Alpha ALPHA6000 Series - 5.9 Fixed-length Function (Group P8)

Chapter 5 Parameter Introductions
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164
◆This function is used to stop the variable pump (auxiliary pumps are all down) when
the flow is zero. In this case, if the frequency of variable pump were lower than the
“dormancy threshold”, the dormancy delay would be start.
◆If the frequency is still below the dormancy threshold (P7.17) after the dormancy
delay time (P7.16), the variable pump will shutdown. As a result, the entire device is
in dormancy state.
◆To awake the device, the pressure feedback must be reduced to awakening threshold.
Then the variable pump would startup. As shown in Fig.5-7-3.
t
t
Del ay Time
Dormancy
threshold
Awakening
Threshold
PI
Feedback
Mot or
Freq.
Fig. 5-7-3 Dormancy and Awakeing diagram
5.9 Fixed-length Function (Group P8)
P8.00 Preset length
Range: 0.000～65.53 m 【0.000m】
P8.01 Actual length
Range: 0.000～65.53 m 【0.000 m】
P8.02 Rate of length
Range: 0.001～30.00 【1.000】
P8.03 Correction Coefficient of length
Range: 0.001～1.000 【1.000】
P8.04 Shaft Diameter
Range: 0.01～100.0 cm 【10.00 cm】
P8.05 Deceleration point
Range: 50～100 % 【90 %】
P8.06 Deviation value
Range: -200.0～200.0 mm 【0mm】
Note:
◆This group of parameters is used for function of stop at fixed length.
◆The ac drive inputs counting pulse by terminals (the ac drive models of no less than
5.5kW: X7 or X8 is defined as function 55, or X7 is defined as function 56 and X8 is
defined as function 57; the ac drive models of no more than 4 kW: X4 or X5 is
defined as function 55, or X4 is defined as function 56 and X5 is defined as function