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270
Operation selection at power failure
and instantaneous power failure
4.17.2 Power failure-time deceleration-to-stop function (Pr. 261 to Pr. 266, Pr. 294 )
* When the setting of Pr. 21 Acceleration/deceleration time increments is "0" (initial value), the setting range is "0 to 3600s" and the setting increments are
"0.1s", and when the setting is "1", the setting range is "0 to 360s" and the setting increments are "0.01s"
When a power failure or undervoltage occurs, the inverter can be decelerated to a stop or can be decelerated
and re-accelerated to the set frequency.
Parameter
Number
Name
Initial
Value
Setting Range Description
261
Power failure stop
selection
0
0
Coasting to stop
When undervoltage or power failure occurs, the inverter output
is shut off.
1
Without under
voltage avoidance
When undervoltage or a power failure
occurs, the inverter can be decelerated
to a stop.
11
With under
voltage avoidance
2
Without under
voltage avoidance
When undervoltage or a power failure
occurs, the inverter can be decelerated
to a stop.
If power is restored during a power
failure, the inverter accelerates again.
12
With under
voltage avoidance
262
Subtracted frequency at
deceleration start
3Hz 0 to 20Hz
Normally operation can be performed with the initial value
unchanged. But adjust the frequency according to the
magnitude of the load specifications (moment of inertia, torque).
263
Subtraction starting
frequency
60Hz
0 to 120Hz
When output frequency ≥ Pr. 263
Decelerate from the speed obtained from output frequency
minus Pr. 262.
When output frequency < Pr. 263
Decelerate from output frequency
9999
Decelerate from the speed obtained from output frequency
minus Pr. 262.
264
Power-failure deceleration
time 1
5s
0 to 3600/ 360s *
Set a deceleration slope down to the frequency set in Pr. 266.
265
Power-failure deceleration
time 2
9999
0 to 3600/ 360s *
Set a deceleration slope below the frequency set in Pr. 266.
9999
Same slope as in Pr. 264
266
Power failure deceleration
time switchover frequency
60Hz 0 to 400Hz
Set the frequency at which the deceleration slope is switched
from the Pr. 264 setting to the Pr. 265 setting.
294 UV avoidance voltage gain 100% 0 to 200%
Adjust the response level during undervoltage avoidance
operation. A larger setting will improve responsiveness to the
bus voltage change.
(1) Connection and parameter setting
⋅ Remove the jumpers across terminals R/L1-R1/L11 and
across terminals S/L2-S1/L21, and connect terminals R1/
L11 and P/+ and terminals S1/L21 and N/-.
⋅ When setting of Pr. 261 is not "0", the motor decelerates to a
stop if an undervoltage, power failure or input phase loss
(when Pr. 872 ="1"(input phase loss enabled)) occurs.
(2) Operation outline of deceleration to stop at
power failure
⋅ If an undervoltage or power failure occurs, the output
frequency is dropped by the frequency set in Pr. 262 .
⋅ Deceleration is made in the deceleration time set in Pr. 264.
(The deceleration time setting is the time required from Pr. 20
Acceleration/deceleration reference frequency to a stop.)
⋅ When the frequency is low and enough regeneration energy
is not provided, for example, the deceleration time (slope)
from Pr. 265 to a stop can be changed.
Power supply
Remove the jumper
Inverter
S/L2
T/L3
S1/L21
P/+
N/−
R1/L11
R/L1
Connect terminals
R1/L11 and P/+
and terminals
S1/L21 and N/-.
Pr.264
Power-failure
deceleration time 1
Pr.265
Power-failure
deceleration
time 2
Time
Power supply
Output
frequency
Subtracted
frequency at
deceleration start
Pr.262
Power-failure
deceleration
time switchover
frequency
P
r.266