Starting After Free Run Stop - Hitachi WJ Series User Manual

Chapter 9
9.7.6

Starting after Free Run Stop

 How to restart the inverter to match the rotation speed of the motor when idling after a free run
Q
stop?
 The brakes are applied when stopping while the stopping method is set to free run stop. How to
start the inverter from 0 Hz?
 Use "Restart mode after FRS release [b088]" to choose either 0 Hz restart, frequency matching
A
*1
restart , or active frequency matching restart
[FRS](11)" terminal is turned from on to off.
 If the "STOP mode selection [b091]" is set to "Free run stop (01)", and the RUN command [OFF]
(stop command) is applied, the inverter enters the free run stop state, and the settings
configured in "Restart mode after FRS release [b088]" will apply the next time the inverter is in
operation. For details on "STOP mode selection [b091]", refer to "9.7.7 Selecting Stop
Operation".
 In case of a 0 Hz restart, there is no retry wait time setting.
 When performing the active frequency matching restart, the RUN command direction when
!
starting the active frequency matching operation is the same as the RUN command direction at
the time of reset input.
Code
Retry wait time after
[b003] instantaneous power
failure/undervoltage error
Restart mode after FRS
[b088]
release
◼ (Example 1) Example of operation when the
"STOP mode selection [b091]" is
set to "Free run stop (01)"
RUN
ON OFF
command
Motor speed
◼
(Example 3) Example of operation when the
[FRS] terminal is turned on and off
during operation (b088 = 00)
Free run stop
[FRS]
RUN
command
Motor speed
Item
Sets the wait time from when the power returns
until the restart.
Performs a 0 Hz restart.
Performs the frequency matching restart
(= Active frequency matching restart at the
frequency of the previous output interruption).
Performs the active frequency matching restart.
Free running
[b003]
Startup according
to [b088]
ON
ON
Free running
0 Hz restart
9-7-9
*2
as the starting method when the "Free run stop
Description
◼ (Example 2) Example of operation when the [FRS]
terminal is turned on and off while the
inverter is stopped
Free run stop
ON
[FRS]
RUN
command
Motor speed
* Switch the free run stop [FRS] terminal from on to off while the
inverter is stopped, and then turn the RUN command on to
start operation according to the [b088] setting.
(In case of 0Hz restart, there is no wait time.)
◼
(Example 4) Example of operation when the
[FRS] terminal is turned on and
off during operation (b088 ≠ 00)
Free run stop
ON
[FRS]
RUN
command
Motor speed
[b088]=01: Frequency matching restart
[b088]=02: Active frequency matching restart
Inverter Functions
Data
0.3 to 100.0 (s)
00
*1
01
*2
02
ON
Free running
[b003]
ON
Free running
[b003]