Mitsubishi FR-A800

(A) Application parameters
PARAMETERS
541
5
GROUP
A
• The power failure time deceleration stop function operates as follows at an input phase loss.
• 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
Action setting at undervoltage and power failure
•Set Pr.261 to select the action at an undervoltage and power failure.
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.
Pr.261 Pr.872
Operation when an input
phase loss occurs
0
0 Continuous operation
1 Input phase loss (E.ILT)
1, 2
0 Continuous operation
1 Deceleration stop
21, 22 — Deceleration stop
• 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.
Pr.261
Setting
Action at undervoltage
and power failure
Power restoration during
deceleration at occurrence
of power failure
Deceleration stop time
Undervoltage avoidance
function
0 Coasts to stop Coasts to stop — —
1
Deceleration stop
Deceleration stop
According to Pr.262 to
Pr.266 setting
Not used
2 Re-acceleration Not used
11 Deceleration stop With
12 Re-acceleration With
21 Deceleration stop
Automatic adjustment of
deceleration time
Not used
22 Re-acceleration Not used
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
During deceleration at
occurrence of power failure
During stop at
occurrence of
power failure
STF
Y46
Time
Turn OFF STF once to make acceleration again
Power
supply
Output frequency
Pr.261 = "1"