Setting 0: Current Detection Speed Search
Setting 1: Speed Estimation Speed Search
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b3-25: Speed Search Wait Time
Sets the wait time between Speed Search restarts.
No. Name Setting Range Default
b3-25 Speed Search Wait Time 0.0 to 30.0 s 0.5 s
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b4: Delay Timers
The timer function is independent of the drive operation and can be used to delay the switching of a digital output triggered
by a digital input signal. An On-delay and Off-delay can be separately set. The delay timer can help to get rid of chattering
switch noise from sensors.
To enable the timer function, a multi-function input must be set to “Timer input” (H1-=18) and a multi-function output
must be set to “Timer output” (H2-=12). One timer can be used only.
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b4-01/b4-02: Timer Function On/Off-Delay Time
b4-01 sets the On-delay time for switching the timer output. b4-02 sets the Off-delay time for switching the timer output.
No. Name Setting Range Default
b4-01 Timer Function On-Delay Time 0.0 to 300.0 s 0.0 s
b4-02 Timer Function Off-Delay Time 0.0 to 300.0 s 0.0 s
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Timer Function Operation
When the timer function input closes for longer than the value set in b4-01, the timer output switches on. When the timer
function input is open for longer than the value set in b4-02, the timer output function switches off. The following diagram
demonstrates the timer function operation.
b4-01 b4-02 b4-01 b4-02
Multi-function Contact
Input: Timer Function
On (Closed)
Off (Open)
On (Closed)
Off (Open)
Multi-function Contact
Output: Timer Function
ON ON
ON ON
Figure 5.16 Timer Operation
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b5: PID Control
The drive has a built in PID (Proportional + Integral + Derivative) controller that can be used for closed loop control of
system variables such as pressure, temperature etc. The difference between the target and the feedback value (deviation)
is fed into the PID controller. The PID controller adjusts the drive output frequency in order to minimize the deviation,
providing an accurate control of the system variables.
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P Control
The output of P control is the product of the deviation and the P gain so that it follows the deviation directly and linearly.
With P control only an offset between the target and feedback remains.
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I Control
The output of I control is the integral of the deviation. It minimizes the offset between target and feedback value that
typically remains when pure P control is used. The integral time (I-time) constant determines how fast the offset is
eliminated.
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D Control
D control predicts the deviation signal by multiplying its derivative (slope of the deviation) with a time constant and adding
this to the PID input. This way the D portion of a PID controller provides a braking action to the controller response and
can reduce the tendency of oscillations and overshoot.
Be aware that D control tends to amplify noise on the deviation signal, which can result in control instability. D control
should therefore only be used when necessary.
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PID Operation
To better demonstrate how PID works, the diagram below shows how the PID output changes when the PID input
(deviation) jumps from 0 to a constant level.
5.2
b: Application
SIEP C710606 20 OYMC AC Drive - V1000 User Manual
115
5
Parameter Details
7/16/2008-13:23
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