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Power failure stop functions (Pr. 261 to Pr. 266)
PARAMETERS
3
<Setting>
Parameter Setting Description
261
0
Coasting to stop
When undervoltage or power failure occurs, the inverter output is shut off.
1 When undervoltage or power failure occurs, the inverter is decelerated to a stop.
262 0 to 600r/min
Normally, operation can be performed with the factory setting unchanged, but the speed
can be adjusted within the range 0 to 600r/min according to the load specifications
(moment of inertia, torque).
263
0 to 3600r/min
If the output speed at occurrence of undervoltage or power failure is equal to or greater
than the speed set in Pr. 263, deceleration starts at the value found by subtracting the
speed set in Pr. 262 from the output speed at that time. If the output speed at occurrence
of undervoltage or power failure is less than the speed set in Pr. 263, the inverter is
decelerated to a stop, starting at the output speed at that time.
9999
The inverter is decelerated to a stop, starting at the value found by subtracting the speed
set in Pr. 262 from the output speed at occurrence of undervoltage or power failure.
264
Pr. 21 = 0 0 to 3600s
Set a deceleration slope down to the speed set in Pr. 266. Set the slope in terms of time
required for deceleration from the speed set in Pr. 20 to 0r/min.
Pr. 21 = 1 0 to 360s
265
Pr. 21 = 0 0 to 3600s
Set a deceleration slope below the speed set in Pr. 266. Set the slope in terms of time
required for deceleration from the speed set in Pr. 20 to 0r/min.
Pr. 21 = 1 0 to 360s
9999 Same slope as in Pr. 264.
266 0 to 3600r/min
Set the speed at which the deceleration slope is switched from the Pr. 264 setting to the
Pr. 265 setting.
CAUTION
1. This function is invalid when the automatic restart after instantaneous power failure function is
activated.
2. If the calculation result of the output speed - set speed of Pr. 262 is negative at occurrence of
undervoltage or power failure, it is regarded as 0r/min.
3. The power failure stop function is not activated if a power failure occurs during a stop or error.
4. If power is restored during deceleration, the inverter is kept decelerated to a stop.
To restart, turn off the start signal once, then turn it on again.
5. This function is not activated when the high power factor converter or power regeneration common
converter is used (Pr. 30 = 2).
CAUTION
If power-failure deceleration operation is set, some loads may cause the inverter to trip and the motor
to coast.
The motor will coast if enough regenerative energy is not given from the motor.
Related parameters
• Pr. 12 "DC injection brake voltage" (Refer to page 82.)
• Pr. 20 "acceleration/deceleration reference speed", Pr. 21 "acceleration/deceleration time increments" (Refer to page 78.)
Pr.278 to Pr.285 Refer to Pr.60 (page 106).