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Increase The Starting Torque (pr. 0) - Mitsubishi Electric FR-A701 Instrucion Manual

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4.3.4

Increase the starting torque (Pr. 0)

Set this parameter when "the motor with a load will not rotate", "an alarm [OL] is output, resulting in an inverter
trip due to [OC1], etc.
Parameter
Name
Number
0
Torque boost
Changing example
When the motor with a load will not rotate,
increase the Pr. 0 value 1% by 1% unit by looking at
the motor movement. (The guideline is for about 10%
change at the greatest.)
1.
Screen at powering on
The monitor display appears.
2.
Press
to choose PU operation mode.
3.
Press
to choose the parameter
setting mode.
4.
5.
Press
to read the currently set value.
"
"(initial value is 3% for the 5.5K)
appears.
6.
Turn
to change it to the set value
"
".
7.
Press
to set.
REMARKS
· A too large setting may cause the motor to overheat, resulting in an overcurrent trip (OL (overcurrent alarm) then E.OC1
(overcurrent trip during acceleration)), overload trip (E.THM (motor overload trip), and E.THT (inverter overload trip)).
(When a fault occurs, release the start command, and decrease the Pr. 0 setting 1% by 1% to reset.)
POINT
If the inverter still does not operate properly after the above measures, adjust Pr. 80, Pr. 81 (Advanced magnetic flux
vector control), Pr.800 (Real sensorless vector control). The Pr.0 setting is invalid under advanced magnetic flux
vector control, real sensorless vector control and vector control. (Refer to chapter 4 of
(applied).)
Initial Value
3%
7.5K or less
2%
11K or more
Operation
Pr. 0) appears.
· By turning
, you can read another parameter.
· Press
to show the setting again.
· Press
twice to show the next parameter.
V/F
V/F
V/F
Setting
Range
Motor torque in the low-frequency range can be
0 to 30%
adjusted to the load to increase the starting motor
torque.
Output
voltage
Pr.0
Setting
Pr.46
range
Pr.112
Display
PU indication is lit.
The parameter
number read
previously appears.
Flicker ··· Parameter setting complete!!
Before operation
Description
100%
0
Output
Base
frequency
frequency
(Hz)
The initial value
differs according
to the capacity.
the instruction manual
4
59

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