Mitsubishi Electric 800 Series Instruction Manual (Function page 124

Pr. Name
816 Torque limit level during
H720 acceleration
817 Torque limit level during
H721 deceleration
858 Terminal 4 function
T040 assignment
874
OLT level setting
H730
*1 The initial value changes from 150% to 200% when the control method is changed from V/F control or Advanced magnetic flux vector control to
Real sensorless vector control or Vector control in the FR-E820-0175(3.7K) or lower, FR-E840-0095(3.7K) or lower, FR-E860-0061(3.7K) or
lower, and FR-E820S-0110(2.2K) or lower.
*2 Torque can be limited via CC-Link, CC-Link IE TSN, and CC-Link IE Field Network Basic. CC-Link communication is unavailable when the Vector
control compatible options is installed.
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.
• Under PM sensorless vector control, 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
Speed command +
 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.
Torque limit input
Pr.810 setting
0 (initial value) Internal torque limit 1
1 External torque limit
2 (Internal torque limit 2)
 Internal torque limit 1 (Pr.810 = "0", Pr.812 to Pr.814)
• The torque is limited by parameter setting
• In the initial value, a limit is applied to all quadrants by Pr.22 Stall prevention operation level (Torque limit level).
Setting
Initial value
range
0% to 400%
9999
9999
0% to 400%
9999
9999
0 0, 4, 6, 9999
150% 0% to 400%
<Vector control>
Speed control
-
method
Perform the torque limit operation using the parameter (Pr.22, Pr.812 to Pr.814) settings.
If changing the torque limit parameters via communication is enabled, the torque limit input
can be performed via communication.
Torque limit using analog voltage (current) to terminal 4 is valid.
• The setting value of Pr.805 or Pr.806 is used as the torque limit value.
• The torque limit via communication is enabled.
Description
Set the torque limit value during acceleration.
The same torque limit as constant speed.
Set the torque limit value during deceleration.
The same torque limit as constant speed.
The torque limit level can be changed with setting value "4" and the
signal to terminal 4.
The inverter can be set to be shut off at activation of torque limit
and stalling of the motor. Set the output to be shut off.
Torque limit
Iq current control
Operation
IM
Encoder
5. Speed Control
5.4 Setting the torque limit level
1
2
3
4
5
6
7
8
9
10
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