Mitsubishi Electric FR-A820-00046 Instruction Manual page 747

Hide thumbs Also See for FR-A820-00046:
Table of Contents

Advertisement

Parameters
Restart operation without frequency search (Pr. 162 = "1, 11")
When Pr. 162 = "1 or 11", reduced voltage start is used for the restart operation. In this method, the
voltage is raised gradually while keeping the output frequency level at the level before the instanta-
neous failure, regardless of the motor's coasting speed.
Fig. 5-284:
NOTES
This restart method uses the output frequency that was active before the instantaneous power
failure stored in memory. If the instantaneous power failure time is 0.2 s or more, the output fre-
quency can no longer be stored and held in memory, so the restart is performed from Pr. 13 "Start-
ing frequency".
During Real sensorless vector control, Pr. 162 is set to "3 or 13" (reduced impact restart).
Restart operation with encoder detection frequency search (Pr. 162 = "2, 12")
● When "2, 12" is set to Pr. 162 by encoder feedback control, the inverter is restarted by the motor
speed and direction of rotation that were detected by the encoder at the power restoration.
● By encoder detection frequency search, the Pr. 299 "Rotation direction detection selection at
restarting" setting are invalid.
Fig. 5-285:
FR-A800
V/F control, Advanced magnetic flux vector control
Instantaneous (power failure) time
Power supply
(R/L1, S/L2,
T/L3)
Motor speed N
(r/min)
Inverter output
frequency f(Hz)
Inverter output
voltage E(V)
Coasting time
Pr. 57 setting
* The output shut off timing differs according to the load condition.
Automatic restart without frequency search (Pr. 162 = 1/11)
Instantaneous (power failure) time
Power supply
(R/L1, S/L2, T/L3)
Motor speed N
(r/min)
Inverter output
frequency f (Hz)
Output voltage E(V)
Coasting
time (Pr. 57)
* The output shut off timing differs according to the load condition.
Restart operation with encoder detection frequency search (Pr. 162 = 2/12)
Restart cushion time
(Pr. 58 setting)
Acceleration time
at a restart (Pr. 611)
Restart cushion time (Pr. 58)
(A) Application parameters
I002714E
I002715E
5 - 567

Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents