Hitachi SJ7002 Series Instruction Manual page 133

Overvoltage
Functions
B130=01 OVLADSTOP = enable
Func. Name/
Code Description
B130 Over-voltage LADSTOP enable
Pauses deceleration ramp when
DC bus voltage rises above
threshold level, in order to avoid
over-voltage trip
B131 Over-voltage LADSTOP level
Sets the threshold level for over-voltage LADSTOP. When the DC bus voltage is above the
threshold value, the inverter stops deceleration until the DC bus voltage is less than the
threshold setting again.
B132 Acceleration and deceleration rate at overvoltage
suppression
B133 Overvoltage suppression proportional gain
B134 Overvoltage suppression integral time
B130/B131: Over-voltage LADSTOP Enable / Over-voltage LADSTOP Level – The over-
voltage LADSTOP function monitors the DC bus voltage and actively changes the output
frequency profile to maintain the DC bus voltage within settable limits. Although "LAD" refers
to "linear acceleration / deceleration," the inverter only "STOPs" the deceleration slope so that
regenerative voltage will not cause the DC bus to rise enough to cause an over-voltage trip
event. Note that acceleration is not affected.
The graph below shows an inverter output profile that starts decelerating to a stop. At two
different points during the deceleration, regenerative voltage elevates the DC bus level, exceed-
ing the LADSTOP threshold set by B131. When the Over-voltage LADSTOP feature is
enabled by B130 = 01, the inverter stops the deceleration ramp in each case until the DC bus
level is again less than the threshold value.
Over-voltage protection
trip threshold
Over-voltage protection
trip threshold
DC bus level
Output
frequency
Keypad
SRW OPE
00
OFF Disable
0 1
ON Enable during deceleration and constant
speed
02
AON Enable during acceleration
330 to 390 (V) for 200V class,
660 to 780 (V) for 400V class
0.10 to 30.00 (seconds)
0.00 to 2.55
0.000 to 9.999, 10.00 to 63.53 (seconds)
Inverter stops deceleration
Start deceleration
Deceleration resumed
Range and Settings
3–49
SJ700 Inverter
2
t
t
Defaults
Run
Mode
FEF2 FUF2 FF2
Edit
FE2 FU2 F2
Lo Hi
(EU) (USA) (Jpn)
✘ ✘
00 00 00
✘ ✘
✘ ✘
✘ ✔
380/ 380/ 380/
760 760 760
✘ ✔
✘ ✔
1.00 1.00 1.00
✘ ✘
0.50 0.50 0.50
✘ ✘
0.060 0.060 0.060