Hitachi SJ Series, User Manual

Page: 213 / 786

12-8-8
Chapter 12 Inverter Function
12.8.4 Stagnate the acceleration or
deceleration in the middle of its
progress
• To withhold temporarily the acceleration until the
motor revolution follows the command in order to
get a larger torque that is needed for starting the
movement.
• To withhold the execution of the command until the
frequency drops sufficiently in order to facilitate the
deceleration that allows the complete stop of the
motor.
• Use the hold function, which is more effective for a
mechanical system that has a larger moment of
inertia.
• The acceleration-hold function is to withhold further
acceleration until the motor that is starting its
revolution achieves a small enough slip. Use this
function when an over current trip happens at the
start of the motor revolution.
• The deceleration-hold function is to withhold further
deceleration until the motor achieves a small
enough slip. Use this function when an over
voltage trip happens during deceleration.
Hold the frequency at any value for a set length of
time.
Parameter
• The working of this function depends on none of
the content of the acceleration pattern selection
[AC-03] and that of the deceleration pattern
selection [AC-04]. This function works for all the
patterns.
• There are two methods of stopping the
acceleration or deceleration, and they can be used
together.
- Stopping automatically at any frequency for any
length of hold time.
- Stopping by means of the Input terminal function.
To hold the frequency by means of the input
terminal 100 [HLD] terminal function.
Item Parameter Data Description
Acceleration-hold
frequency
[AG110] 0.00~590.00(Hz)
Setting the frequency at which the
acceleration is withheld.
A setting of 0.00 is not valid.
Acceleration-hold time [AG111] 0.00~60.00(s)
Setting the length of time for which the
acceleration is withheld.
Deceleration-hold
frequency
[AG112] 0.00~590.00(Hz)
Setting the frequency at which the
deceleration is withheld.
A setting of 0.00 is not valid.
Deceleration-hold time [AG113] 0.00~60.00(s)
Setting the length of time for which the
deceleration is withheld.
Input terminal function
selection
[CA-01]~[CA-11] 100
Using the acceleration- or deceleration-hold
[HLD] function.
Q
A
!
[AG111]
[AG110]
Output frequency
Time
[AG112]
[AG113]
A155
[HLD]
Output frequency
Time
ON ON
OFF