Mitsubishi Electric 700 Series, Instruction Manual

Page: 169 / 416

158
Operation selection at power failure
and instantaneous power failure
(5) Power failure deceleration signal (Y46 signal)
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After a power failure stop, inverter cannot start even if power is restored and the start command is given. In this
case, check the power failure deceleration signal (Y46 signal). (at occurrence of input phase loss protection
(E.ILF), etc.)
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The Y46 signal is ON during deceleration at an instantaneous power failure or during a stop after deceleration at an
instantaneous power failure.
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For the Y46 signal, set "46 (forward action)" or "146 (reverse action)" in any of Pr. 190 to Pr. 196 (output terminal
function selection) to assign the function.
REMARKS
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Stop selection function is disabled while inverter decelerates due to a power failure, even though stop selection (Pr. 250) is set.
CAUTION
⋅
When Pr. 30 Regenerative function selection = "2" (FR-HC, MT-HC, FR-CV is used), the power failure deceleration function is
invalid.
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When the (output frequency - Pr. 262 ) at undervoltage or power failure occurrence is negative, the calculation result is regarded
as 0Hz. (DC injection brake operation is performed without deceleration).
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During a stop or trip, the power failure stop selection is not performed.
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Y46 signal turns on when undervoltage occurs even when the motor is not decelerating at an instantaneous power failure. For
this reason, Y46 signal outputs instantly at powering OFF, which is not a fault.
⋅
When power failure deceleration stop function is selected, undervoltage protection (E.UVT), instantaneous power failure
protection (E.IPF), and input phase loss protection (E.ILF) do not function.
⋅
Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection) may affect the other terminals. Please
set parameters after confirming the function of each terminal.
CAUTION
Even if the power failure stop function is valid, some loads may cause the inverter to trip and the motor to coast.
The motor will coast if enough regenerative energy is given from the motor.
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Parameters referred to
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Pr. 12 DC injection brake operation voltage Refer to page 112
Pr. 20 Acceleration/deceleration reference frequency, Pr. 21 Acceleration/deceleration time increments Refer to page 101
Pr. 30 Regenerative function selection Refer to page 114
Pr. 57 Restart coasting time Refer to page 152
Pr. 190 to Pr. 196 (output terminal function selection) Refer to page 128
Pr. 872 Input phase loss protection selection Refer to page 162