Power Failure Time Deceleration-To-Stop Function - Mitsubishi Electric 800 Series Instruction Manual

14.10

Power failure time deceleration-to-stop function

V/F V/F V/F Magnetic flux Sensorless Sensorless Sensorless
Magnetic flux Magnetic flux
This is a function to decelerate the motor to a stop when an instantaneous power failure or undervoltage occurs.
Pr. Name
261 Power failure stop
A730 selection
 Power failure stop function (Pr.261 = "1")
• 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
During deceleration at
occurrence of power failure
During stop at
occurrence of
power failure
STF
Turn OFF STF once to make acceleration again
Y46
NOTE
• If the automatic restart after instantaneous power failure is selected (Pr.57 Restart coasting time ≠ "9999") while the power
failure time deceleration stop function is set enabled (Pr.261 = "1"), the power failure time deceleration stop function is
disabled.
• When the power failure time deceleration stop function is enabled (Pr.261 = "1"), 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.
Power supply
STF
Y46
Initial Setting
value range
The inverter output is shut off at an undervoltage or when a power
0
failure occurs.
1 The inverter decelerates the motor to a stop at an undervoltage or
when a power failure occurs.
0
The inverter decelerates the motor to a stop at an undervoltage or
when a power failure occurs.
2
The inverter re-accelerates the motor if the power restores during
the deceleration.
Time
ON
Output
Not started as inverter
frequency
is stopped due to power
failure
OFF
ON
ON
Description
Time
14.10 Power failure time deceleration-to-stop function
14.(A) Application Parameters
11
12
13
14
15
16
17
18
19
20
373