Yaskawa G5HHP Drive - Manual (Page 206)

Advanced Operation
7.5.1 Application Constants: b
7 - 42
J
Speed Search: b3-01 to b3-03
The speed search function finds the speed of a coasting motor and starts up smoothly from that speed. It is
effective in situations such as switching from a commercial power supply.
Speed Search Selection at Start: b3-01
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
b3-01
Speed search selection
at start
x 0, 1 -- 0 * A A A A
* When the control method is switched, the factory setting changes as follows:
V/f control: 0; V/f with PG: 1; open-loop vector 0; flux vector: 1
D
Settings
Setting Contents
0 Speed search disabled: Motor starts from minimum output frequency.
1
Speed search enabled: Speed search is performed from maximum output frequency and motor
is started. (In control methods with PG, i.e., V/f with PG feedback and
flux vector, motor starts from the motor speed.)
D
Set “1” to use the speed search function. A speed search is performed each time the run command is
input.
D
To use speed search freely in control methods without PG, i.e., V/f control and open-loop vector control,
set the multi-function contact input selection (H1-01 to H1-06) to 61 or 62 (external search command).
(See para 7.5.5.)
Speed Search Operating Current, Speed Search Deceleration Time, and Min. Baseblock Time:
b3-02, b3-03, L2-03
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
b3-02
Speed search operat-
ing current
x 0 to 200 %
100
(150) *1
A x A x
b3-03
Speed search decel-
eration time
x 0.1 to 10.0 s 2.0 A x A x
L2-03 Min. baseblock time x 0.0 to 0.5 s 0.5 *2 B B B B
* 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 400-V class Inverters of 200 kW.
D
For the speed search operating current (b3-02), set the operating current for the speed search. If restart-
ing is not possible with the setting, then lower the setting.
D
Set the speed search operating current as a percentage of the Inverter’s rated output current, with the
Inverter’s rated output current taken as 100%.
D
For the speed search deceleration time (b3-03), set the output frequency deceleration time for while the
speed search is being performed. Set the time required to decelerate from the maximum output frequen-
cy to 0 Hz.
D
When the speed search and DC injection braking are set, set the minimum baseblock time (L2-03). For
the minimum baseblock time, set the time to wait for the motor’s residual voltage to dissipate. If an over-
current is detected when starting a speed search or DC injection braking, raise the setting to prevent a
fault from occurring.
7