12.3 b: Application
666 YASKAWA SIEPC71061705H GA700 Series Technical Manual
If the drive detects oC [Overcurrent] immediately after Speed Search Starts:
• Increase the value of L2-03 [Minimum Baseblock Time] and decrease the motor speed you use to start Speed
Search.
• Increases the setting value of b3-08 [Speed Estimation ACR P Gain].
• Increase the value of b3-54.
If the drive detects oC or ov [DC Bus Overvoltage] during Speed Search, increase the value of b3-08.
■ b3-55: Current Increment Time
No.
(Hex.)
Name Description
Default
(Range)
b3-55
(3124)
Expert
Current Increment Time
Sets the length of time that the drive will increase the current from zero current to the setting
value of b3-06 [Speed Estimation Current Level 1].
10 ms
(10 - 2000 ms)
Gradually increase the setting value when a large quantity of current flows after speed search starts. If you set this
value too high, speed search will not operate correctly.
■ b3-56: InverseRotationSearch WaitTime
No.
(Hex.)
Name Description
Default
(Range)
b3-56
(3126)
InverseRotationSearch
WaitTime
Sets the wait time until the drive starts inverse rotation search after it completes forward search
when you do inverse rotation search during Current Detection Speed Search.
Determined by o2-04
(0.1 - 5.0 s)
■ b3-61: Initial Pole Detection Gain
No.
(Hex.)
Name Description
Default
(Range)
b3-61
(1B96)
Expert
Init Magnet Pole Estimation
Gain
Sets the responsiveness for initial motor magnetic pole calculation when A1-02 = 6 [Control
Method Selection = AOLV/PM]. Set b3-61 > 0.0 for an ordinary IPM motor.
5.0
(-20.0 - +20.0)
Note:
• Set n8-35 = 1 [Initial Pole Calculation Method = High Frequency Injection] to enable this parameter.
• The drive automatically calculates this value when High Frequency Injection Auto-Tuning completes successfully.
Used when n8-35 = 1 [Initial Pole Detection Method = High Frequency Injection]. Sets the responsiveness for
initial motor magnetic pole calculation. Set this parameter to a positive value for an ordinary monitor. When you
use High Frequency injection Tuning, it will automatically set this parameter.
◆ b4: Timer Function
The drive uses timers to delay activating and deactivating MFDO terminals.
Timers prevent sensors and switches from making chattering noise.
There are two types of timers:
• Timers that set a delay for timer inputs and timer outputs.
These timers delay activating and deactivating of the MFDIs and MFDOs.
To enable this function, set H1-xx = 18 [MFDI Function Select = Timer Function], and set H2-01 to H2-03 =
12 [MFDO Function Select = Timer Output].
• Timers that set a delay to activate and deactivate MFDO terminals.
These timers delay activating and deactivating MFDO terminals.
To enable this function, set delay times in parameters b4-03 to b4-08.
■ Timer Function Operation
• Timers that Set a Delay for Timer Inputs and Timer Outputs
Triggers timer output if the timer input is active for longer than the time set in b4-01 [Timer Function ON-Delay
Time]. Triggers timer output late for the time set in b4-02 [Timer Function OFF-Delay Time]. Figure 12.33
shows an example of how the timer function works.
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