Parameter Details
11
11.3 b: Application
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 721
■ b3-36: High Back EMF Detection Level
No.
(Hex.)
Name Description
Default
(Range)
b3-36
(0BC4)
Expert
High Back EMF
Detection Level
Sets one of the factors in the formula to prevent drive restarts and cause the
drive to enter standby. The drive will enter standby and will not restart when
the detected induced voltage of the motor ≥ power supply voltage × b3-36.
Usually it is not necessary to change this setting.
0.970
(0.500 - 1.000)
For example, if the setting value is 0.83% and the voltage does not decrease to the induced voltage at
approximately 183 V when the power supply voltage is 220 V, the drive will not do restarts.
■ b3-54: Search Time
No.
(Hex.)
Name Description
Default
(Range)
b3-54
(3123)
Search Time
Sets the length of time that the drive will run Speed Search.
400 ms
(10 - 2000 ms)
If you set this parameter too low, Speed Search will not operate correctly.
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.
◆ 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 11.33
shows an example of how the timer function works.
To Next Page
Loading...
