Hitachi SH1 Series Basic Manual page 69

Chapter 4
[bA-30] to [bA145]
Deceleration / stop at power loss (Non-stop)
Code/Name
bA-30
Instantaneous
power failure non-stop
function, mode selection
bA-31
Instantaneous
power failure non-stop
function, start voltage level
bA-32
Instantaneous
power failure non-stop
function, target voltage level
bA-34
Instantaneous
power failure non-stop
function, deceleration time
bA-36
Instantaneous
power failure non-stop
function, start frequency
decrement
bA-37
Instantaneous
power failure non-stop
function, DC bus voltage
control P gain
bA-38
Instantaneous
power failure non-stop
function, DC bus voltage
control I gain
・If the DC bus voltage of the main circuit is lower than the level of [bA-31], the
inverter decelerates to create a regenerative state.
・When [bA-30]=01, if the DC bus voltage drops under [bA-31], the current
frequency reference is decreased by [bA-36] setting and decelerates depending
on the [bA-34] setting.
If the DC bus voltage rises to the [bA-32] setting, the deceleration stops once.
・When [bA-30] = 02/03, at the time of DC bus voltage drop, deceleration is
performed to regenerate and the DC bus voltage is maintained at the [bA-32] set
value by PI control.
・During Instantaneous power failure non-stop deceleration, output terminal
023[IPS] turns ON.
Overvoltage suppression - deceleration
Code/Name
00(Disable)/
01(Constant DC bus voltage
bA140
Overvoltage
suppression enable
02(Enable acceleration)/
setting, 1st-motor
03(Enable acceleration (at
constant speed and
deceleration))
bA141
Overvoltage
(400V class)
suppression active level,
660.0 to 800.0(VDC)
1st-motor
bA142
Overvoltage
0.00 to 3600.00(s)
suppression active time,
1st-motor
bA144
Constant DC
0.00 to 5.00
bus voltage control P gain,
1st-motor
bA145
Constant DC
0.00 to 150.00(s)
bus voltage control I
gain, 1st-motor
・When [bA140] = 01, the inverter stops with the deceleration time
extended so that the DC bus voltage do not cross over the [bA141]
level.
・When [bA140] = 02, 03, the inverter accelerates once so that the DC
bus voltage do not cross over [bA141] level.
Range (unit) Initial value
00(Disable)/
01(Deceleration-stop)/
02 (Voltage controlled
decel-stop(without
00
recovery)) /
03 (Voltage controlled
decel-stop (with
recovery)
(400V
(400V class)
class)
0.0 to 820.0(VDC)
440.0
(400V
(400V class)
class)
0.0 to 820.0(VDC)
720.0
0.01 to 3600.00(s) 1.00
0.00 to 10.00(Hz) 0.00
0.00 to 5.00 0.20
0.00 to 150.00(s) 1.00
Range (unit) Initial value
control(deceleration
stop))
00
(400V
class)
760
1.00
0.20
1.00
For parameter configuration
Overvoltage suppression - Over-excitation
Code/Name
bA146
Over-magnetization
function selection,
1st-motor
bA147
Over-magnetization
function output
filter time constant,
1st-motor
bA148
Over-magnetization
function voltage
gain, 1st-motor
bA149
Over-magnetization
function level
setting, 1st-motor
・This function disables the AVR(Automatic output Voltage
Regulation) function, works while in over-excitation.
・This function is effective when control method
[AA121/AA221] is set 00 to 02 or 04 to 06 (V/f control).
・When [bA146]=03/04, it will be operative if DC bus
voltage exceeds [bA-149] level.
Dynamic braking (BRD) function
Code/Name
bA-60
Dynamic brake use
ratio
bA-61
Dynamic brake activation
selection
bA-62
Dynamic brake
activation level
bA-63
Dynamic brake
resistor value
*1) The [bA-60] setting range is
0.0 to 10.0 x [(bA-63)/(Inverter minimum resistor)]^2 (%).
・This function sets the behavior of the built-in braking
circuits.
・When using the external braking unit, these parameters
need not be set.
・Regarding the built-in braking circuit models and the
connectable minimum resistance value, refer to the
specification table in Chapter 7.
4-26
[bA146] to [bA-63]
Range (unit)
00(Disable)/
01(Always enable)/
02(At deceleration only)/
03(Operation at setting level)/
04(Operation at setting level at
deceleration only)
0.00 to 1.00(s)
50 to 400(%)
(400V Class)
660.0 to 800.0(VDC)
Range (unit)
*1)
00(Disable)/
01(Only while running)
02(Enable during stop)
(400V class)
660.0 to 800.0(VDC)
Inverter minimum
resistor value to
600(Ω)
Initial
value
02
0.30
100
(400V
Class)
720
Initial value
10.0
00
(400V
class)
720.0
Minimum
resistance