Timer Functions: B4-01, B4-02; Speed Search Timing Chart - YASKAWA VARISPEED-616G5 Instruction Manual

Settings
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Setting
0 Speed search disabled:
Speed search enabled:
1*
Care must be taken as the motor accelerates rapidly under a light load in open-loop vector control mode.
Set "1" to use the speed search function. A speed search is performed each time the run command is
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input.
To use speed search freely in control methods without PG, i.e., V/f control and open-loop vector con-
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trol, set the multi-function contact input selection (H1-01 to H1-06) to 61 or 62 (external search com-
mand). (See para 7.5.5.)
Speed Search Operating Current, Speed Search Deceleration Time, and Min. Baseblock Time:
b3-02, b3-03, L2-03
User User
Constant Name
Number
Speed search operat-
b3-02
ing current
Speed search decel-
b3-03
eration time
L2-03 Min. baseblock time
* 1. The factory setting for V/f control is 150%.
* 2. The factory setting varies depending on the Inverter capacity. The values shown in the table
are for 200 V class Inverters of 0.4 kW.
For the speed search operating current (b3-02), set the operating current for the speed search. If restart-
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ing is not possible with the setting, then lower the setting.
Set the speed search operating current as a percentage of the Inverter's rated output current, with the
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Inverter's rated output current taken as 100%.
For the speed search deceleration time (b3-03), set the output frequency deceleration time for while
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the speed search is being performed. Set the time required to decelerate from the maximum output fre-
quency to 0 Hz.
When the speed search and DC injection braking are set, set the minimum baseblock time (L2-03). For
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the minimum baseblock time, set the time to wait for the motor's residual voltage to dissipate. If an
overcurrent is detected when starting a speed search or DC injection braking, raise the setting to pre-
vent a fault from occurring.
OFF
Run command
Maximum output
frequency
Output frequency
Output current
Fig 7.21

Speed Search Timing Chart

Timer Functions: b4-01, b4-02

J
The timer functions are enabled when the timer function input (setting: 18) and the timer function out-
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put (setting: 12) are set for the multi-function input and multi-function output respectively.
These inputs and outputs serve as general-purpose I/O. Chattering of sensors, switches, and so on, can
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be prevented by setting a delay time.
Contents
Motor starts from minimum output frequency.
Speed search is performed from maximum output frequency and
motor is started. (In control methods with PG, i.e., V/f with PG feed-
back and flux vector, motor starts from the motor speed.)
Change g
during during Setting Setting
Opera- Range
tion
0 to 200
×
0.1 to 10.0
×
0.1 to 0.5
×
ON
Deceleration time set for b3-03
Minimum baseblock time (L2-03)
7 - 45
7.5 Common Functions
Valid Access Levels
Unit Factory Factory
V/f V/f with
Setting
Control PG
100
% A
×
*1
(150)
A
s 2.0
×
*2
s 0.5 B B
Frequency
reference
that is set
b3-02
Open
Flux
Loop
Vector
Vector
A
×
A
×
B B
7