YASKAWA L1000A - B2: Magnetic Flux Compensation

5.2 b: Application
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual 169
Parameter Details
5
◆ b2: Magnetic Flux Compensation
■ b2-08: Magnetic Flux Compensation Value
Sets the magnetic flux compensation at start as a percentage of the no-load current value (E2-03). This function allows for
the development of more flux to facilitate starting machines that require high starting torque or motors with a large rotor
time constant.
When an Up/Down command is issued, the DC current level injected into the motor changes linearly from the level set to
b2-08 to the level set to E2-03 within the time set to b2-03.
Figure 5.1
Figure 5.1 Magnetic Flux Compensation
The level of the DC current injected to the motor is limited to 80% of the drive rated current or to the motor rated current,
whichever value is smaller.
Note: 1. If b2-08 is set below 100%, it can take a relatively long time for flux to develop.
2. If b2-08 is set to 0%, the DC current level will be the DC Injection current set to S1-02.
3. As DC Injection can generate a fair amount of noise, b2-08 may need to be adjusted to keep noise levels acceptable.
◆ b4: Delay Timers
The timer function is independent of drive operation and can delay the switching of a digital output triggered by a digital
input signal and help eliminate chattering switch noise from sensors. An on-delay and off-delay can be set separately.
To enable the timer function, set a multi-function input to Timer input (H1- = 18) and set a multi-function output to
Timer output (H2- = 12). Only one timer can be used.
■
b4-01, b4-02: Timer Function On-Delay, 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.
■
Timer Function Operation
The timer function switches on when the timer function input closes for longer than the value set to b4-01. The timer
function switches off when the timer function input is open for longer than the value set to b4-02. Figure 5.2 illustrates
the timer function operation:
Figure 5.2
Figure 5.2 Timer Operation
No. Parameter Name Setting Range Default
b2-08 Magnetic Flux Compensation Value 0 to 1000% 0%
No. Parameter Name Setting Range Default
b4-01 Timer Function On-Delay Time 0.0 to 3000.0 s 0.0 s
b4-02 Timer Function Off-Delay Time 0.0 to 3000.0 s 0.0 s
E2-03
Time
S1-04
Magnetizing Current
Reference
b2-08
Output Speed
common_TMonly
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
common_TMonly
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