Continuous Operation Function At Instantaneous Power Failure (Pr.261 = "2, 12, 22"); Undervoltage Avoidance Function (Pr.261 = "11, 12" Pr.294) - Mitsubishi Electric FR-F800 Instruction Manual

(A) Application parameters
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.
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.
When power is restored during
Pr.261 = 2
deceleration at occurrence of
power failure
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
∗ Acceleration time depends on Pr.7 (Pr.44 ).
Undervoltage avoidance function (Pr.261 = "11, 12" Pr.294)
• If "11, 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.
• Adjust the downward frequency slope and the response level using Pr.294 UV avoidance voltage gain. Setting a large
value improves the response to the bus voltage.
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PARAMETERS
IPF
Output
frequency
Reacceleration ∗
Time
Power supply
STF
Y46
Pr.261 = 2, Pr.57 9999
During power failure
Power
supply
During deceleration
at occurrence of
power failure
Y46
ON
Not started as inverter
is stopped due to power
failure
OFF
ON
ON
When used with automatic restart
after instantaneous power failure
Automatic restart
after instantaneous
power failure
Time
Reset time + Pr.57
Output
frequency
Time