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Operation selection at power failure and instantaneous power failure
4.12.2 Power-failure deceleration stop function (Pr. 261)
The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
When a power failure or undervoltage occurs, the inverter can be decelerated to a stop or can be decelerated and re-
accelerated to the set frequency.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
261
Power failure stop
selection
0
0
Coasts to stop.
When undervoltage or power failure occurs, the inverter output
is shut off.
1
When undervoltage or a power failure occurs, the inverter can
be decelerated to a stop.
2
When undervoltage or a power failure occurs, the inverter can
be decelerated to a stop.
If power is restored during a power failure, the inverter
accelerates again.
(1) Parameter setting
When Pr. 261 is set to "1 or 2", the inverter decelerates to a stop
if an undervoltage or power failure occurs.
(2) Operation outline of deceleration to stop at power
failure
When undervoltage or power failure occurs, the output
frequency is decreased and controled so that the converter
circuit (DC bus) voltage is constant and decreased to 0Hz to
stop.
REMARKS
When automatic restart after instantaneous power failure is selected (Pr. 57 ≠ "9999"), power failure stop function is made
invalid and automatic restart operation after instantaneous power failure is valid.
After a power failure stop, the inverter will not start even if the power is restored with the start signal (STF/STR) input. After
switching on the power, turn OFF the start signal once and then on again to make a start.
Pr. 261 = 0
Pr. 261 = 1, 2
Time
Power
ON OFF
Output frequency
During deceleration
at occurrence of power failure
During stop
at occurrence
of power failure
STF
Y46
Time
Turn off STF once to make acceleration again
Power
Output frequency
Pr. 261 = 1
(3) Power failure stop function (Pr. 261 = "1")
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.
STF
Power
Time
Y46
Not started as inverter
is stopped due to
power failure
ON
OFF
ON
Output frequency