Hitachi SJ300 Series Instruction Manual page 108

3–40
"B" Group: Fine-Tuning Functions
Func.
Name
Code
B046 Reverse Run protection
enable
Func.
Name
Code
B050 Controlled deceleration
and stop on power loss
B051 DC bus voltage trigger
level during power loss
B052 Over-voltage threshold
during power loss
B053 Deceleration time
setting during power
loss
B054 Initial output frequency
decrease during power
loss
"B" Function
Description
Prohibits reverse motor
rotation. Two option codes:
00 Disable
01 Enable
Controlled Deceleration at Power Loss – When enabled, this feature permits the inverter to
control final motor deceleration upon loss of inverter input power. First, you must make a
wiring change to the inverter. See
page 4–4 for complete instructions including wiring and signal timing diagrams for using the
controlled deceleration at power loss feature.
After making the wiring change, use function B050 to enable the feature. Use B051 to deter-
mine the point at which a decaying DC bus voltage will trigger the controlled deceleration. Use
parameter B054 to specify an initial step-wise deceleration at power loss, and B053 to specify
the duration of the linear deceleration.
During the controlled deceleration the inverter itself acts as a load to decelerate the motor. With
either a high-inertia load or a short deceleration time (or both), it is possible that the inverter
impedance will not be low enough to continue linear deceleration and avoid an over-voltage
condition on the DC bus. Use parameter B052 to specify a threshold for the over-voltage. In
this case, the inverter pauses deceleration (runs at constant speed). When the DC bus decays
again below the threshold, linear deceleration resumes. The pause/resume process will repeat as
necessary until the DC bus energy is depleted (under-voltage condition occurs).
"B" Function
Description
Allows inverter control
using regenerative energy to
decelerate after loss of input
power (requires jumper
change)
Two option codes:
00 Disable
01 Enable
Sets trigger for controlled
deceleration and stop on
power loss function.
Range is 0.0 to 1000.V
Sets over-voltage threshold
for controlled deceleration
function.
Range is 0.0 to 1000.V
Range is 0.01 to 99.99 sec. /
100.0 to 999.9 sec. /
1000 to 3600 sec.
Sets the initial decrease in
output frequency upon
power loss.
Range is 0.00 to 10.00 Hz
Defaults
Run
Mode
Edit
–FE –FU –FR
Lo Hi
(EU) (US) (JP)
✘ ✔
00 00 00
"Optional Controlled Decel and Alarm at Power Loss" on
Defaults
Run
Mode
Edit
–FE –FU –FR
Lo Hi
(EU) (US) (JP)
✘ ✘
00 00 00
✘ ✘
0.0 0.0 0.0
✘ ✘
0.0 0.0 0.0
✘ ✘
1.00 1.00 1.00
✘ ✘
0.00 0.00 0.00
SRW Display
Units
— >b046 LIMIT
PREV OFF
SRW Display
Units
— >b050 IPS-DECEL
Mode OFF
VDC >b051 IPS-DECEL
V1 0000.0Vdc
VDC
>b052 IPS-DECEL
V2 0000.0Vdc
sec. >b053 IPS-DECEL
TIME 0001.00s
Hz >b054 IPS-DECEL
DEC-F 00.00Hz