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8 PARAMETER FUNCTIONS
8-54
8.6.5 Power failure deceleration-to-stop operation
Initial value
Pr. 261 "power failure stop selection" 0
Pr. 262 "subtracted speed at deceleration start" 0
Pr. 263 "subtraction starting speed" 2000
Pr. 264 "power-failure deceleration time 1" 5
Pr. 265 "power-failure deceleration time 2" 9999
Pr. 266 "power-failure deceleration time switch-over speed" 2000
If input power is switched "OFF" due to a power failure, regenerative energy from the motor can be
utilized to decelerate the motor to a stop.
Remove the jumpers across the main circuit terminals R-R1 and S-S1, and connect R1-P/+ and S1-
N/-.
Power supply
Speed
Pr. 266
Switch-over
speed
Subtracted
Pr. 262
speed
Power-failure deceleration time 1
Pr. 264
Power-failure
deceleration time 2
Pr. 265
Pr. Setting Range Unit Operation
0
Switching "OFF" input power coasts the motor to a stop.
261
1
Switching "OFF" input power decelerates the motor to a
stop
262 0 to 600 r/min
Normally, operation can be performed with the factory
setting unchanged. Adjust the speed to meet the load
specifications (inertia moment, torque magnitude).
0 to 3000 r/min
When the motor speed at power "OFF" is greater than the
value set in Pr. 263, deceleration starts at the value found
by subtracting the Pr. 262 setting from the motor speed.
When the motor speed is less than the Pr. 263 setting,
the motor is decelerated to a stop, starting at the motor
speed. When the Pr. 263 setting and motor speed are
close, the Pr. 262 function may not be activated.
263
9999
Deceleration starts at the value found by subtracting the
Pr. 262 setting from the motor speed at power "OFF".
Pr. 21 = 0 0.0 to 3600
264
Pr. 21 = 1 0.00 to 360
s
Set a deceleration slope down to the Pr. 266 setting. Set
the slope in terms of the deceleration time, Pr. 264, from
the speed set in Pr. 20 [Section 8.5.2] to a stop. The
setting range can be changed using Pr. 21 [Section 8.5.2].
Pr. 21 = 0 0.0 to 3600
Pr. 21 = 1 0.00 to 360
s
Set a deceleration slope down to the Pr. 266 setting. Set
the slope in terms of the deceleration time, Pr. 264, from
the speed set in Pr. 20 [Section 8.5.2] to a stop. The
setting range can be changed using Pr. 21 [Section 8.5.2].
265
9999
The deceleration slope from the Pr. 266 setting to a
stop is the value set in Pr. 264.
266 0 to 3000 r/min
Set the speed at which the deceleration slope is
changed.
MEMO
Depending on the load, the power-failure detection function may not be activated
properly, causing the motor to coast to a stop.
If the motor speed at power "OFF" is less than the Pr. 262 setting, the motor stops
immediately.
If power is switched on during power-failure deceleration operation, deceleration-to-
stop operation is continued. To restart, turn "OFF" the start signal once, then turn it
"ON" again.
When the FR-HC high power factor converter is used, this function is made invalid.