Mitsubishi Electric FR-A800 Series Instruction Manual page 248

Pr.
813 Torque limit level (3rd
H702 quadrant)
814 Torque limit level (4th
H703 quadrant)
815
Torque limit level 2
H710
816 Torque limit level during
H720 acceleration
817 Torque limit level during
H721 deceleration
858 Terminal 4 function
T040 assignment
868 Terminal 1 function
T010 assignment
874
OLT level setting
H730
*1 When changing from V/F control or Advanced magnetic flux vector control to Real sensorless vector control or Vector control in the FR-A820-
00250(3.7K) or lower or the FR-A840-00126(3.7K) or lower, 150% changes to 200%.
NOTE
• The lower limit for the torque limit level under Real sensorless vector control is set to 30% even if a value lower than 30% is set.
• When the low-speed range high-torque characteristic is disabled under PM sensorless vector control (Pr.788 = "0"), the torque
limit is not activated in a low-speed range with a rated frequency of less than 10%.
• Under PM sensorless vector control, the torque limit level is reduced inversely proportional to the output frequency in the
constant output range of the rated motor frequency or higher.
 Block diagram of torque limit
 Selecting the torque limit input method (Pr.810)
• Use Pr.810 Torque limit input method selection to select the method to limit the output torque for speed control.
The method in the initial setting is use of the parameter settings.
Pr.810 setting
0 (initial value)
1
2
 Torque limit level using parameter settings (Pr.810 = "0", Pr.812 to Pr.814)
• The torque is limited by parameter setting (Internal torque limit 1).
• In the initial value, a limit is applied to all quadrants by Pr.22 Stall prevention operation level (Torque limit level).
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Name Initial value
9999
9999
9999
9999
9999
0
0
150%
<Vector control>
Speed command +
-
Torque limit input
method
Perform the torque limit operation using the parameter (Pr.22, Pr.812 to Pr.814) settings.
Internal torque limit 1 If changing the torque limit parameters via communication is enabled, the torque limit input
can be performed via communication.
External torque limit Torque limit using analog voltage (current) to terminal 1 or terminal 4 is valid.
The torque limit through the CC-Link (FR-A8NC) or CC-Link IE Field Network (FR-A8NCE/
(Internal torque limit 2)
FR-A800-GF) communication is valid.
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
search engine
Setting
range
0 to 400% Set the torque limit level for reverse rotation power driving.
9999 Limit using Pr.22 or the analog terminal values.
0 to 400% Set the torque limit level for reverse rotation regenerative driving.
9999 Limit using Pr.22 or the analog terminal values.
When the torque limit selection (TL) signal is ON, Pr.815 is the
0 to 400%
torque limit value regardless of Pr.810.
9999 The torque limit set to Pr.810 is valid.
0 to 400% Set the torque limit value during acceleration.
9999 The same torque limit as constant speed.
0 to 400% Set the torque limit value during deceleration.
9999 The same torque limit as constant speed.
The torque limit level can be changed with setting value "4" and the
0, 1, 4, 9999
signal to terminal 4.
The torque limit level can be changed with setting value "4" and the
0 to 6, 9999
signal to terminal 1.
The inverter can be set to be shut off at activation of torque limit
0 to 400%
and stalling of the motor. Set the output to be shut off.
Torque limit
Speed control
Description
Iq current control
M
Encoder
Operation
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
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