Mitsubishi Electric 800 Series Instruction Manual page 461

 Power failure stop function (Pr.261 ="1, 11, 21")
• Even if power is restored during deceleration triggered by a power failure, deceleration stop is continued after which the
inverter stays stopped. To restart operation, turn the start signal OFF then ON again.
NOTE
• If the automatic restart after instantaneous power failure is selected (Pr.57 Restart coasting time  "9999") while the
power failure time deceleration-to-stop function is set enabled (Pr.261 = "1, 11, or 21"), the power failure time deceleration-
to-stop function is disabled.
• When the power failure time deceleration-to-stop function is enabled (Pr.261 = "1, 11 or 21"), the inverter will not start even
if the power is turned ON or inverter reset is performed with the start signal (STF/STR) ON. Turn OFF the start signal once
and then ON again to make a start.
ON
Power supply
Not started as inverter
is stopped due to power
failure
STF
Y46
• During cyclic transmission or the like (in which start commands are periodically transmitted), operation is restarted if the
power is restored during the deceleration even when the power failure time deceleration-to-stop function is enabled.
 Continuous operation function at instantaneous power failure (Pr.261
="2, 12, 22")
• The motor re-accelerates to the set frequency if the power restores during the deceleration to stop.
• Combining with the automatic restart after instantaneous power failure function enables a power failure time deceleration
stop and re-acceleration at a power restoration. If the power is restored after stoppage by a power failure, a restart
operation is performed when automatic restart after instantaneous power failure (Pr.57  "9999") is selected.
Pr.261 = 2
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
∗ Acceleration time depends on Pr.7 (Pr.44 ).
460
5. PARAMETERS
5.11 (A) Application parameters
Pr.261 = "1"
Power
supply
STF
Y46
Output
frequency
Time
OFF
ON
ON
When power is restored during
deceleration at occurrence of
power failure
IPF
Reacceleration ∗
Time
During deceleration at
occurrence of power failure
During stop at
occurrence of
power failure
Turn OFF STF once to make acceleration again
Pr.261 = 2, Pr.57
During power failure
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
Time
When used with automatic restart
9999
after instantaneous power failure
Automatic restart
after instantaneous
power failure
Reset time + Pr.57
Time