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4.13.4 Power failure-time deceleration-to-stop function (Pr. 261 to Pr. 266 )
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
Name
Number
Power failure stop
261
selection
Subtracted frequency
262
at deceleration start
Subtraction starting
263
frequency
Power-failure
264
deceleration time 1
Power-failure
265
deceleration time 2
Power failure
266
deceleration time
switchover frequency
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
*1
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"
*2
Performing IPM parameter initialization changes the settings. (Refer to page 80)
Power supply
Remove the jumper
Connect terminal
R1/L11 and P/+
and terminal
S1/L21 and N/-.
Power supply
Output
Subtracted
frequency
frequency at
Power-failure
deceleration start
Pr.262
deceleration
time switchover
frequency
Pr.266
Initial
Setting
Value
Range
Operation at
undervoltage or
power failure
0
Coasts to a stop
1
Decelerates to a stop
0
2
Decelerates to a stop
21
Decelerates to a stop
22
Decelerates to a stop
Normally operation can be performed with the initial value unchanged. But
3Hz
0 to 20Hz
adjust the frequency according to the magnitude of the load specifications
(moment of inertia, torque).
When output frequency ≥ Pr. 263
0 to
Decelerate from the speed obtained from output frequency minus Pr. 262.
60Hz
When output frequency < Pr. 263
120Hz
*2
Decelerate from output frequency
9999
Decelerate from the speed obtained from output frequency minus Pr. 262.
0 to 3600/
5s
Set a deceleration slope down to the frequency set in Pr. 266.
360s
*1
0 to 3600/
Set a deceleration slope below the frequency set in Pr. 266.
360s
9999
*1
9999
Same slope as in Pr. 264
60Hz
0 to
Set the frequency at which the deceleration slope is switched from the Pr. 264
setting to the Pr. 265 setting.
400Hz
*2
(1) Connection and parameter setting
⋅ Remove the jumpers across terminals R/L1 and R1/L11 and
Inverter
R/L1
across terminals S/L2 and S1/L21, and connect terminals
S/L2
R1/L11 and P/+ and terminals S1/L21 and N/-.
T/L3
⋅ When setting of Pr. 261 is not "0", the motor decelerates to a
R1/L11
S1/L21
stop if an undervoltage, power failure or input phase loss
P/+
(when Pr. 872 ="1"(input phase loss enabled)) occurs.
N/−
(2) Operation outline of deceleration to stop at
power failure
⋅ If an undervoltage or power failure occurs, the output
Pr.264
frequency is dropped by the frequency set in Pr. 262 .
Power-failure
⋅ Deceleration is made in the deceleration time set in Pr. 264.
deceleration time 1
(The deceleration time setting is the time required from Pr. 20
Pr.265
Acceleration/deceleration reference frequency to a stop.)
Power-failure
deceleration
⋅ Change the deceleration time (slope) to a stop using Pr.265
time 2
when the frequency is too low to obtain the regenerative
Time
energy, or in other instances.
⋅ With the Pr.261 = "21 or 22" setting, the deceleration time is
automatically adjusted to keep (DC bus) voltage constant in
the converter when the motor decelerates to a stop.
(The Pr.262 to Pr.266 settings become invalid.)
Operation selection at power failure
and instantaneous power failure
Description
At power restoration
Deceleration time to a
during power failure
deceleration
Coasts to a stop
—
Depends on Pr. 262 to
Decelerates to a stop
Pr. 266 settings
Depends on Pr. 262 to
Accelerates again
Pr. 266 settings
Automatically adjusts
Decelerates to a stop
the deceleration time
Automatically adjusts
Accelerates again
the deceleration time
stop
4
169
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