Mitsubishi Electric 800 Series Instruction Manual page 528

• The power failure time deceleration stop function operates as follows at an input phase loss.
Operation when an input
Pr.261 Pr.872
0 Continuous operation
0
1 Input phase loss (E.ILF)
0 Continuous operation
1, 2
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
Power supply
Output
Subtracted
frequency
frequency at
Power-failure deceleration start
deceleration Pr.262
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
Setting and power failure
0 Coasts to stop
1
2
11
Deceleration stop
12
21
22
Power failure stop function (Pr.261 ="1, 11, 21")
• Even if power is restored during deceleration triggered by a power failure, deceleration stop is continued after which the
inverter stays stopped. To restart operation, turn the start signal OFF then ON again.
phase loss occurs
• If an undervoltage or power failure occurs, the output frequency is
Pr.264
Power-failure
deceleration time 1
• The motor decelerates for the time set to Pr.264 Power-failure
Pr.265
Power-failure
deceleration
time 2
Time
• Change the deceleration time (slope) to stop using Pr.265
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.261 = "1"
Power
supply
During deceleration at
occurrence of power failure
STF
Turn OFF STF once to make acceleration again
Y46
turned OFF only for the frequency set to Pr.262 Subtracted
frequency at deceleration start.
deceleration time 1. (The deceleration time setting is the time it
takes for the motor to stop from Pr.20 Acceleration/deceleration
reference frequency.)
Power-failure deceleration time 2 when the frequency is too
low to obtain the regenerative energy or in other instances.
Deceleration stop time
—
According to Pr.262 to
Pr.266 setting
Automatic adjustment of
deceleration time
During stop at
occurrence of
power failure
Time
(A) Application parameters
Undervoltage avoidance
function
—
Not used
Not used
With
With
Not used
Not used
PARAMETERS
5
GROUP
A
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