Operation selection at power failure and instantaneous power failure
(3) Automatic restart operation adjustment (Pr. 611)
Using Pr. 611, the acceleration time to reach Pr. 20 Acceleration/deceleration reference frequency can be set. This can
be set separately from the normal acceleration time.
Even if the Pr. 21 Acceleration/deceleration time increments setting is changed, the setting increments of Pr. 611 remain unchanged.
An IPM motor is a motor with interior permanent magnets. Regression voltage is generated when the motor coasts at an
instantaneous power failure or makes a flying start. The inverter's DC bus voltage increases if the motor coasts fast or makes
a flying start in this condition.
When using the automatic restart after instantaneous power failure function (Pr. 57 Restart coasting time "9999"), it is
recommended to use the regenerative avoidance operation (Pr. 882 Regeneration avoidance operation selection = "1") in
combination for more a stable start. If the overvoltage protective function (E.OV) activates at restart even with the
regeneration avoidance function, additionally use the retry function (Pr. 67).
An IPM motor is a motor with interior permanent magnets. High voltage is generated at motor terminals while the
motor is running. Do not touch motor terminals and other parts until the motor stops to prevent an electric shock.
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 the automatic restart after instantaneous power failure function, apply in easily visible
places the CAUTION stickers supplied.
Parameters referred to
Pr. 13 Starting frequency
Pr. 65, Pr. 67 to Pr. 69 Retry function
Pr. 78 Reverse rotation prevention selection
Pr. 178 to Pr. 182 (input terminal function selection)
Regeneration avoidance operation selection
Refer to page 116
Refer to page 170
Refer to page 197
Refer to page 134
Refer to page 262