12.2 b: APPLICATION
538 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
■ b3-55 Speed Curr Rise Time
No.
(Hex.)
Name Description
Default
(Range)
b3-55
(3124)
Expert
Speed Curr Rise Time
Sets the length of time that the drive will increase the current from zero current to the setting
value of b3-06 [Speed Curr Lev1 for Estimation].
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
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: MFDI Function Select = 60 [Timer Fn Input], and set H2-01, H2-02, and
H2-03 = 39 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection = 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 ON Time Delay].
Triggers timer output late for the time set in b4-02 [Timer OFF Time Delay]. Figure 12.26 shows an example of
how the timer function works.
Figure 12.26 Example of Timer Function Operation
• Setting on/off-delay time for MFDO
Figure 12.27 uses H2-01 terminals to show an example of how the timer function works. Use b4-03 [2NO-2CM
ON Time Delay] and b4-04 [2NO-2CM OFF Time Delay] to set this function.
Figure 12.27 Example of How the Timer Function Works with H2-01 Terminals
Note:
When the terminal is triggered, it continues for a minimum of 100 ms. The on/off-delay time of MFDO terminal does not have an effect.
■ b4-01 Timer ON Time Delay
No.
(Hex.)
Name Description
Default
(Range)
b4-01
(01A3)
Timer ON Time Delay
Sets the ON-delay time for the timer input.
0.0 s
(0.0 - 3000.0 s)
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