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Operation selection at power failure
and instantaneous power failure
4
PARAMETERS
4.12.2 Power failure signal (Y67 signal)
When output is shutoff due to a power failure or undervoltage, the Y67 signal turns ON regardless of the automatic
restart after instantaneous power failure function setting.
Y67 signal turns OFF at power failure recovery or undervoltage recovery.
To use Y67 signal, set "67 (positive logic) or 167 (negative logic)" in any of Pr. 190 to Pr. 192 (Output terminal function
selection) to assign the function.
CAUTION
Provide mechanical interlocks for MC1 and MC2. The inverter will be damaged if the power supply is input to the
inverter output section.
When automatic restart after instantaneous power failure has been selected, the motor and machine will start
suddenly (after the reset time has elapsed) after occurrence of an instantaneous power failure. Stay away from
the motor and machine. When you have selected automatic restart after instantaneous power failure function,
apply in easily visible places the CAUTION stickers supplied to the installation guideline.
♦ Parameters referred to ♦
Pr. 7 Acceleration time, Pr. 21 Acceleration/deceleration time increments Refer to page 101
Pr. 13 Starting frequency Refer to page 104
Pr. 65, Pr. 67 to Pr. 69 Retry function Refer to page 159
Pr. 78 Reverse rotation prevention selection Refer to page 190
Pr. 178 to Pr. 189 (input terminal function selection) Refer to page 122
CAUTION
⋅ Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other functions. Set
parameters after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196 (output terminal function selection) Refer to page 128
Recovery after power failure
Y67
Time
OFF
Power supply
Output frequency
ONON
ON OFFOFF
Converter voltage recovery after E.UVT
Y67
Time
ON
Power supply
Output frequency
ON
OFFOFF
E.UVT occurrence
Converter voltage recovery