Hitachi SJ7002 Series Instruction Manual page 181

4–20
Using Intelligent Input Terminals
Two-stage
Acceleration and
Deceleration
09
Opt. Code
[2CH]
Symbol
Valid for
[1] to [8]
Inputs
Required A092, A093,
A094=0
Settings
Default
[5]
terminal
Free-run Stop
11
Opt. Code
[FRS]
Symbol
Valid for
[1] to [8]
Inputs
B003, B088,
Required
C011 to
Settings
C018
Default
[4]
terminal
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When terminal [2CH] is turned ON, the
inverter changes the rate of acceleration and
deceleration from the initial settings (F002
and F003) to use the second set of accelera-
tion/deceleration values (A092 and A093).
When the terminal is turned OFF, the
inverter returns to the original acceleration
and deceleration time (F002 acceleration
time 1 and F003 deceleration time 1). Use
A092 (acceleration time 2) and A093
(deceleration time 2) to set the second stage
acceleration and deceleration times.
In the graph shown above, the [2CH] signal becomes active during acceleration. This causes the
inverter to switch from using acceleration 1 (F002) to acceleration 2 (A092).
Note the following:
• Function A094 selects the method for second stage acceleration. It must be set = 00 to select
the input terminal method in order for the [2CH] terminal assignment to operate.
When the terminal [FRS] is turned ON, the inverter turns OFF the output and the motor enters
the free-run state (coasting). If terminal [FRS] is turned OFF, the output resumes sending power
to the motor if the Run command is still active. The free-run stop feature works with other
parameters to provide flexibility in stopping and starting motor rotation.
In the diagram below, parameter B088 selects whether the inverter resumes operation from
0 Hz (left graph) or the current motor rotation speed (right graph) when the [FRS] terminal
turns OFF. The application determines the best setting.
Parameter B003 specifies a delay time before resuming operation from a free-run stop. To
disable this feature, use a zero delay time.
Resume from 0Hz
Zero-frequency start
Motor
speed
Switches
FRS
[FW, RV]
In the diagram above, [FRS] signal is active high. If you want the [FRS] terminal to be active
low (normally closed logic), change the setting (C011 to C018) that corresponds to the input [1]
to [8] that is assigned the [FRS] function (C001 to C008).
Output
frequency
Input
signals
[2CH]
[FW, RV]
Resume from current speed
B088=00
Motor
speed
t
Switches
[FW, RV]
target frequency
second
initial
B003
FRS
t
B088=01
wait time
t