7.5 Common Functions
7-45
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 feed-
back and flux vector, motor starts from the motor speed.)
Care must be taken as the motor accelerates rapidly under a light load in open-loop vector control mode.
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 con-
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
Change
Valid Access Levels
Constant
Number
Name
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
×
0 to 200 %
100
(150)
*1
A
×
A
×
b3-03
Speed search decel-
eration time
×
0.1 to 10.0 s 2.0
A
×
A
×
L2-03
Min. baseblock time
×
0.1 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 200 V class Inverters of 0.4 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 fre-
quency 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
overcurrent is detected when starting a speed search or DC injection braking, raise the setting to pre-
vent a fault from occurring.
Run command
OFF ON
Maximum output
frequency
Deceleration time set for b3-03
Frequency
reference
that is set
Output frequency
Minimum baseblock time (L2-03)
b3-02
Output current
Fig 7.21 Speed Search Timing Chart
J
Timer Functions: b4-01, b4-02
D
The timer functions are enabled when the timer function input (setting: 18) and the timer function out-
put (setting: 12) are set for the multi-function input and multi-function output respectively.
D
These inputs and outputs serve as general-purpose I/O. Chattering of sensors, switches, and so on, can
be prevented by setting a delay time.
7
To Next Page
Loading...
Need help?
General