Hitachi SJ Series, User Manual

Page: 312 / 786

12-13-5
Chapter 12
Inverter Function
For constant DC voltage control [bA140] = 01
For function to avoid overvoltage acceleration
(only in deceleration)
[bA140] = 02
• When [bA141] is 01, PI control is performed so that
the internal DC voltage will be constant.
• Setting the proportional gain [bA143] to be large will
accelerate the response. However, setting it to be
too large will dissipate the control, tending to cause
tripping.
• Setting the integral gain [bA144] to be short will
accelerate the response. However, setting it to be
too short will tend to cause tripping.
• If the internal DC voltage increases when [bA141] is
02 or 03, acceleration control is performed.
• The acceleration control accelerates to the highest
frequency setting according to the overvoltage
suppression operating time [bA142]. After the
acceleration, it decelerates to the target value
according to the normal deceleration time.
• If the overvoltage suppression operating time
[bA142] is set to be too short, it accelerates more
than decelerating and may prevent the motor from
stopping. In this case, increase the setting of the
overvoltage suppression level setting [bA141].
For function to avoid overvoltage acceleration
[bA140] = 03
A
!
OvervoltageSup
pression Level
[bA141]
Main Circuit DC
Voltage (V)
Time
Output
Frequency (Hz)
Deceleration
Starts
Time
Constant DC
Voltage Control
Set Deceleration Time
Actual
Deceleration Time
OvervoltageSuppr
ession Level
[bA141]
Main Circuit DC
Voltage (V)
Time
Output
Frequency (Hz)
Deceleration
Starts
Time
Accelerates
Set Deceleration Time
Actual
No Response
OvervoltageSuppr
ession Level
[bA141]
Main Circuit DC
Voltage (V)
Time
Output
Frequency (Hz)
Deceleration
Starts
Time
Accelerates
according to [bA142]
Set Deceleration Time
Actual Deceleration Time