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(3) Power failure stop function (Pr. 261 = "1, 21")
⋅ If power is restored during power failure deceleration, deceleration to a stop is continued and the inverter remains
stopped. To restart, turn OFF the start signal once, then turn it ON again.
⋅ At power failure when Pr. 261 = "21", inverter decelerates to stop automatically by adjusting the deceleration time to
make converter voltage (DC bus) constant. (The setting of Pr. 262 to Pr. 266 are invalid.)
Pr. 261 = "1"
Power
supply
During deceleration at
occurrence of power failure
During stop at
occurrence of
power failure
STF
Y46
Turn OFF STF once to make acceleration again
REMARKS
⋅
When automatic restart after instantaneous power failure is selected (Pr. 57
restart after instantaneous power failure operation is performed.
⋅
When the power failure deceleration stop function is active (Pr. 261 = "1,
21"), the inverter will not start even if the power is turned ON with the
start signal (STF/STR) ON. After switching ON the power supply, turn
OFF the start signal once and then ON again to make a start.
(4) Operation continuation at instantaneous power failure function (Pr. 261 = "2, 22")
⋅ When power is restored during deceleration after an instantaneous power failure, acceleration is made again up to
the set frequency.
⋅ When this function is used in combination with the automatic restart after instantaneous power failure operation,
deceleration is available at a power failure and acceleration is available again after power restoration. When power
is restored after a stop by deceleration at an instantaneous power failure, automatic restart operation is performed
if automatic restart after instantaneous power failure has been selected (Pr. 57 ≠ "9999")
⋅ At power failure when Pr. 261 = "22", inverter decelerates to stop automatically by adjusting the deceleration time to
make converter voltage (DC bus) constant. If the power supply recovers, inverter accelerates again to the set
frequency.
⋅ The setting of Pr. 262 to Pr. 266 are invalid when Pr. 261 = "22".
.
When power is restored during
Pr. 261 = "2"
deceleration at occurrence of
power failure
IPF
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
* Acceleration time depends on Pr. 7 (Pr. 44 ).
Power
supply
Time
STF
Y46
Power
supply
Output
frequency
Reacceleration*
Time
Y46
Operation selection at power failure
and instantaneous power failure
Pr. 261 = "21"
During deceleration at
occurrence of power failure
Deceleration time: automatically adjusted
During stop at
occurrence of
power failure
Turn OFF STF once to make acceleration again
≠
"9999"), deceleration to stop function is invalid and the
ON
Power supply
Not started as inverter
is stopped due to power
failure
STF
Y46
When used with automatic restart
Pr. 261 = "2", Pr. 57
"9999"
after instantaneous power failure
During power failure
During deceleration
at occurrence of
power failure
Time
Output
frequency
Time
OFF
ON
ON
Automatic restart
after instantaneous
power failure
Time
Reset time + Pr. 57
159
4
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