Mitsubishi Electric 800 Series Instruction Manual page 460

• The power failure time deceleration stop function operates as follows at an input phase loss.
Pr.261 Pr.872 Operation when an input phase
0 0 Continuous operation
1 Input phase loss (E.ILF)
1, 2 0 Continuous operation
1 Deceleration stop
21, 22 — Deceleration stop
• 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 PWF signal of the converter unit is assigned and the
terminal to which 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.
 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
Setting and power failure
0 Coasts to stop
1 Deceleration stop
2
11
12
21
22
loss occurs
Power supply
Output
Subtracted
frequency
frequency at
Power-failure deceleration start
deceleration Pr.262
time switchover
frequency
Pr.266
Power restoration during
deceleration at occurrence of
power failure
Coasts to stop
Deceleration stop
Re-acceleration
Deceleration stop
Re-acceleration
Deceleration stop
Re-acceleration
Pr.264
Power-failure
deceleration time 1
Pr.265
Power-failure
deceleration
time 2
Time
Deceleration stop time
— —
According to Pr.262 to Not used
Pr.266 setting
Not used
With
With
Automatic adjustment of Not used
deceleration time
Not used
5.11 (A) Application parameters
Undervoltage avoidance
function
459
5. PARAMETERS
3
4
5
5
5
6
7
8
9
10