Mitsubishi Electronics FR-A700 ユーザーズマニュアル

* 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.

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

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).

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.

5s

 0 to 3600/ 360s *

Set a deceleration slope down to the frequency set in Pr. 266.

9999

 0 to 3600/ 360s *

Set a deceleration slope below the frequency set in Pr. 266.

9999

Same slope as in Pr. 264

60Hz

 0 to 400Hz

Set the frequency at which the deceleration slope is switched 
from the Pr. 264 setting to the Pr. 265 setting.

100%

 0 to 200%

Adjust the response level during undervoltage avoidance 
operation. A larger setting will improve responsiveness to the 
bus voltage change. 

⋅ 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.

⋅ 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
Pr.266