6-107
6
îš„PID Sleep
The PID sleep function stops the Inverter when the PID output value falls below the sleep operation level (b5-
15) for the sleep operation time set in parameter b5-16. The inverter operation will resume, if the PID output
value exceeds the sleep operation level for the time set in parameter b5-16 or longer.
The PID sleep function works as well when the PID control is disabled. In this case the frequency reference
value is observed by the sleep function instead of the PID output value.
The PID sleep time chart is shown below.
Fig 6.84 PID Sleep Time Chart
îš„Square Root Feedback Operation
If parameter b5-28 is set to 1, the feedback value is converted into a value that equals the square root of the
actual feedback. This can be used to control the flow rate when a pressure sensor is used to generate a feed-
back value. Using parameter b5-29 the square root feedback can be multiplied with a factor. Following for-
mula applies:
So linear connection between the PID target value and the feedback can be realized.
îš„PID Monitor Feedback Function
Using this function an internal monitor (U1-) can be set as PID feedback value. The monitor item can be
selected in parameter b5-31. The following set values are possible:
Set Value Function
Control Methods
V/f
V/f with
PG
Open
loop
Vector
Closed
Loop
Vector
0 Disabled Yes Yes Yes Yes
3 Output current Yes Yes Yes Yes
5 Motor Speed No Yes Yes Yes
6 Output voltage Yes Yes Yes Yes
7 DC bus voltage Yes Yes Yes Yes
8 Output power Yes Yes Yes Yes
9 Torque reference No No Yes Yes
15 Terminal A1 input level Yes Yes Yes Yes
16 Terminal A2 input level Yes Yes Yes Yes
18 Motor secondary current Yes Yes Yes Yes
PID output value
Internal run command
External run command
Operating
Operation status output
Run command has been input
Stopped
Sleep operation lev-
el b5-15
Sleep operation
delay time
Sleep operation
delay time
Operation
Flow rate Gain (b5-29) Pressure (head)×=
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