“B” Group: Fine-Tuning Functions
Configur
ing Dr
iv
e
P
a
ra
meters
3–46
NOTE:
Other events can cause (or be configured to cause) a free-run stop, such as power loss
(see
“Automatic Restart Mode and Phase Loss” on page 3–30
), and inverter trip events in
general (see
“Miscellaneous Functions” on page 3–62
). If all free-run stop behavior is impor-
tant to your application (such as HVAC), be sure to configure each event accordingly.
Some additional parameters further configure all instances of a free-run stop. Parameter B003,
Retry Wait Time Before Motor Restart, sets the minimum time the inverter will free-run. For
example, if B003 = 4 seconds (and B091=01) and the cause of the free-run stop lasts 10
seconds, the inverter will free-run (coast) for a total of 14 seconds before driving the motor
again. Parameter B007, Restart Frequency Threshold, sets the motor frequency at which the
inverter will no longer resume and accelerate, instead resuming from 0 Hz (complete stop).
Motor
speed
[FW, RV]
Zero-frequency start
Motor
speed
Resume from current speed
wait time
[FW, RV]
B003
B088=01
B088=00
Resume from 0Hz
B091=01
Stop Mode = free-run stop
B091=01 Stop Mode = free-run stop
t
t
Func.
Code
Name/
Description
Keypad
Range and Settings
Defaults
Run
Mode
Edit
Lo Hi
SRW
OPE
FEF2
FE2
(EU)
FUF2
FU2
(USA)
FF2
F2
(Jpn)
B088
Restart mode after FRS
ZST
00
Restart from 0Hz
00
00
00
✘ ✔
Selects how the inverter
resumes operation when
the free-run stop (FRS) is
cancelled
fST
0 1
Restart from frequency detected from
actual speed of motor
FIX
02
Restart from active matching frequency
B089
Automatic carrier
frequency reduction
OFF
00
Disable
00
00
00
✘ ✔
ON
0 1
Enable
✘ ✔
B090
Dynamic braking usage ratio
0.0 to 100.0 (%)
Set = 0.0 to disable dynamic braking
00
00
00
✘ ✔
Selects the braking duty cycle for the dynamic braking resistor
(total brake % ON-time per 100 second interval)
✘ ✔
B091
Stop mode selection
DEC
00
DEC (decelerate and stop)
00
00
00
✘ ✘
Selects how the inverter
stops the motor
FRS
0 1
FRS (free run to stop)
✘ ✘
B092
Cooling fan control
(see note below)
OFF
00
Fan always ON
00
00
00
✘ ✘
ON
0 1
Fan ON during RUN, OFF during STOP
✘ ✘
B095
Dynamic braking control
OFF
00
Disable
00
00
00
✘ ✔
ON
STPOFF
0 1
Enable during RUN only
✘ ✔
ON
STPON
02
Enable always
✘ ✔