Mitsubishi Electric FR-A800 Series Instruction Manual page 644

• The power failure time deceleration-to-stop function operates as follows at an input phase loss.
Pr.261
0
1, 2
21, 22
• For the separated converter type, remove the jumpers between terminals R/L1 and R1/L11 and terminals S/L2 and S1/
L21 of the converter unit, and connect terminals R1/L11 and P/+ and terminals S1/L21 and N/-. Do not remove the jumpers
of terminal R1/L11 and terminal S1/L21 of the inverter. (In the initial status of the separated converter type, terminals P/+
and R1/L11 and terminals N/- and S1/L21 are connected.)
• For the separated converter type, connect the terminal to which the PWF signal of the converter unit is assigned and the
terminal to which the X48 signal of the inverter is assigned. Also, set Pr.261 of the converter unit in accordance with the
inverter setting. (Refer to the Instruction Manual of the converter unit.)
 Outline of operation of deceleration stop at a power failure
• If an undervoltage or power failure occurs, the output frequency is turned OFF only for the frequency set to Pr.262
Subtracted frequency at deceleration start.
• The motor decelerates for the time set to Pr.264 Power-failure deceleration time 1. (The deceleration time setting is the
time it takes for the motor to stop from Pr.20 Acceleration/deceleration reference frequency.)
• Change the deceleration time (slope) to stop using Pr.265 Power-failure deceleration time 2 when the frequency is too
low to obtain the regenerative energy or in other instances.
Power supply
Output
frequency
Power-failure
deceleration
time switchover
frequency
Pr.266
 Action setting at undervoltage and power failure
• Set Pr.261 to select the action at an undervoltage and power failure.
Pr.261 Action at undervoltage and
setting
0 Coasts to stop
1
2
11
Deceleration stop
12
21
22
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Pr.872
0
1
0
1
—
Pr.264
Power-failure
Subtracted
deceleration time 1
frequency at
deceleration start
Pr.262
Power restoration during
deceleration at occurrence
power failure
Coasts to stop
Deceleration stop
Re-acceleration
Deceleration stop
Re-acceleration
Deceleration stop
Re-acceleration
search engine
Operation when an input phase loss occurs
Operation continues
Input phase loss (E.ILF)
Operation continues
Deceleration stop
Deceleration stop
Pr.265
Power-failure
deceleration
time 2
Time
Deceleration stop time
of power failure
—
According to Pr.262 to Pr.266
setting
Automatic adjustment of
deceleration time
Undervoltage avoidance
function
—
Not available
Not available
Available
Available
Not available
Not available
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
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