Mitsubishi Electric 800 Series Instruction Manual page 459

5.11.14 Power failure time deceleration-to-stop function
This is a function to decelerate the motor to a stop when an instantaneous power failure or undervoltage occurs.
Pr.
261 Power failure stop selection
A730
262 Subtracted frequency at
A731 deceleration start
263 Subtraction starting frequency
A732
264 Power-failure deceleration time 1 5 s
A733
265 Power-failure deceleration time 2 9999
A734
266 Power failure deceleration time
A735 switchover frequency
294 UV avoidance voltage gain
A785
668 Power failure stop frequency
A786 gain
606 Power failure stop external
T722 signal input selection
 Connection and parameter setting
Power supply
Remove the jumper
Connect terminals
R1/L11 and P/+
and terminals
S1/L21 and N/-.
• For the standard model, remove the jumpers between terminals R/L1 and R1/L11 and terminals S/L2 and S1/L21, and
connect terminals R1/L11 and P/+ and terminals S1/L21 and N/-.
• If an undervoltage, power failure or input phase loss occurs when Pr.261 Power failure stop selection  "0", the motor
decelerates to a stop.
458
5. PARAMETERS
5.11 (A) Application parameters
Name Initial value
0
3 Hz
60 Hz
60 Hz
100%
100%
1
Inverter
R/L1
S/L2
T/L3
R1/L11
Remove the jumper
S1/L21
P/+
N/-
Connect terminals
R1/L11 and P/+
Standard models
and terminals
S1/L21 and N/-.
Setting
range
0 Power failure time deceleration-to-stop function disabled
1, 2, 11, 12, Power failure time deceleration-to-stop function enabled
21, 22 Select action at an undervoltage or when an power failure
occurs.
0 to 20 Hz Normally, the motor runs at the initial value as it is.
However, adjust to suit the size of the load specification
(moment of inertia, torque).
0 to 590 Hz When output frequency ≥ Pr.263:
The motor decelerates if the output frequency decreases
by the frequency set in Pr.262.
When output frequency < Pr.263:
The motor decelerates at frequencies of the output
frequency.
9999 The motor decelerates from the "output frequency -
Pr.262".
0 to 3600 s Set the slope applicable from the deceleration start to the
Pr.266 set frequency.
0 to 3600 s Set the slope applicable for the frequency range starting at
Pr.266 and downward.
9999 Same as Pr.264.
0 to 590 Hz Set the frequency at which the slope during deceleration
switches from the Pr.264 setting to the Pr.265 setting.
0 to 200% Adjust the response at undervoltage avoidance operation.
Setting a large value improves the response to changes in
the bus voltage.
0 to 200% Adjust the response level for the operation where the
deceleration time is automatically adjusted.
0 Normally open input (NO contact input specification)
1 Normally closed input (NC contact input specification)
Converter unit
R/L1
Power supply
S/L2
T/L3
R1/L11
S1/L21
Description
Keep the jumpers of terminal
R1/L11 and terminal S1/L21
connected.
Inverter
P/+ P/+
N/- N/-
R1/L11
S1/L21
RDA MRS(X10)
RSO RES
PWF X48
SE SD
Separated converter type
U
V M
W