B4: Timer Function - YASKAWA CR700 Technical Manual

This function is used to completely stop a motor with a large inertia during deceleration, and prevent the inertia
from causing the motor to continue rotating.
A setting of 0.00 disables this function.
When a longer time is necessary to stop the motor, increase the value.
b2-08: Magnetic Flux Compensation Value
■
No.
Name
(Hex.)
b2-08 Magnetic Flux
Compensation Value
(0190)
This parameter is effective when you start a high-capacity motor (a motor with a large secondary circuit time
constant). This function can quickly increase motor flux to make high starting torque (a process called initial
excitation).
The current level for DC Injection Braking at start changes linearly from the setting of b2-08 to the setting of b2-
03 as shown in
Figure 11.24.
Note:
• If b2-08 < 100%, flux will develop very slowly.
• When b2-08 = 0%, the DC current level will be the DC Injection current set in b2-02 [DC Injection Braking Current].
• If b2-08 is set too high, DC Injection Braking at start can cause a large noise. Adjust b2-08 to decrease the volume to the permitted
level.

b4: Timer Function

◆
The drive uses timers to delay activating and deactivating MFDO terminals.
Timers prevent chattering noise from sensors and switches.
Set delay times in parameters b4-03 to b4-12 to enable this function.
Timer Function Operation
■
• Setting ON/OFF-Delay Time for MFDO
The following diagram shows an example of how the timer function works using H2-01 terminals. Set this
function with b4-03 [Terminal M1-M2 ON-Delay Time] and b4-04 [Terminal M1-M2 OFF-Delay Time].
Figure 11.25 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 regardless of the setting of on/off-delay time of MFDO terminal.
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
V/f CL-V/f OLV CLV
Sets how much current the drive injects when DC Injection Braking at Start starts (Initial
Excitation) as a percentage of E2-03 [Motor No-Load Current].
Figure 11.24 DC Current Level during DC Injection Braking at Start
Description
AOLV
11.3 b: Application
Default
(Range)
0%
(0 - 1000%)
11
595