Mitsubishi Electric FR-A800 Series Instruction Manual page 645

 Power failure stop function (Pr.261 = "1, 11, or 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.
Pr.261 = "1"
Power
supply
STF
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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 stop
function is disabled.
• When the power failure time deceleration-to-stop function is enabled (Pr.261 = "1, 11 or 21"), the inverter does 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.
• 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, or 22")
• The motor re-accelerates to the set frequency when the power restores during the deceleration triggered by a power
failure.
• Combining with the automatic restart after instantaneous power failure function enables a deceleration triggered by a
power failure 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
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*1 Acceleration time depends on Pr.7 (Pr.44)
 Undervoltage avoidance function (Pr.261 = "11 or 12", Pr.294)
• When "11 or 12" is set to Pr.261, the deceleration time is adjusted (shortened) to prevent an undervoltage from occurring
during deceleration at occurrence of power failure.
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5. PARAMETERS
5.14 (A) Application parameters
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During deceleration at
occurrence of power failure
During stop at
occurrence of
power failure
Turn OFF STF once to make acceleration again
ON
Power supply
Not started as inverter
is stopped due to power
failure
STF
ON
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When power is restored during
deceleration at occurrence of
power failure
IPF
Reacceleration ∗1
search engine
Time
Output
frequency
Time
OFF
ON
Pr.261 = 2, Pr.57
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Time
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When used with automatic restart
9999
after instantaneous power failure
During power failure
Automatic restart
after instantaneous
power failure
Reset time + Pr.57
Time