Hitachi LH1 Series Basic Manual page 66

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
output frequency will be decreased by the amount set in the [bA-36]
and then the inverter will decelerate according to the deceleration time
[bA-34]. Once the DC bus voltage exceeds the [bA-32], the deceleration
is temporally stopped.
・When [bA-30] = 02/03, at the time of DC bus voltage drop, PI control is
performed to generate a regenerative state by deceleration and keep
the DC bus voltage at the [bA-32] set value.
・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
control(deceleration stop))
02(Enable acceleration)/
suppression enable
03(Enable acceleration (at
setting, 1st-motor
constant speed and
deceleration))
bA141
Overvoltage
(400V class)
suppression active level,
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 class) (400V class)
0.0 to 820.0(Vdc) 440.0
(400V class) (400V 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
Initial value
Range (unit)
00
(400V class)
660.0 to 800.0(Vdc) 760
1.00
0.20
1.00
For parameter configuration
Overvoltage suppression - Over-excitation
Code/Name
00(Disable)/
bA146
01(Always enable)/
02(At deceleration only)/
Over-magnetization
03(Operation at setting level)/
function selection,
04(Operation at setting level at
1st-motor
bA147
Over-magnetization
0.00 to 1.00(s)
function output
filter time constant,
1st-motor
bA148
Over-magnetization
50 to 400(%)
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.
・When [AA121]=00 to 02, 04 to 06, (V/f) is enabled.
・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 actual dynamic brake use ratio is
[bA-60]×([bA-63] / (Inverter minimum resistor))^2.
・This function operates the braking resistor of the built-in
braking circuits models. To use the BRD, setting [bA-60]
and [bA-61] is required.
・Refer to the specification table of Chapter 7 for the
minimum resistance value that can be connected.
4-26
[bA146] to [bA-63]
Range (unit)
deceleration only)
(400V Class)
660.0 to 800.0(Vdc)
Range (unit)
0.0 to 10.0(%) *1)
00(Disable)/
01(Only while running)
02(Enable during stop)
(400V class)
660.0 to 800.0(V)
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