Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 238

Pr. Name
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 FR-A820-
00250(3.7K) or lower or 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
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
 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).
• To set individually for each quadrant, use Pr.812 Torque limit level (regeneration), Pr.813 Torque limit level (3rd
quadrant), Pr.814 Torque limit level (4th quadrant). When "9999" is set, Pr.22 setting is regarded as torque limit level
in all the quadrants.
Torque limit
+
Reverse
regeneration
Reverse
quad4
rotation
(Pr.814)
quad3
(Pr.812)
(Pr.813)
Reverse
driving
-
Rated speed
 Torque limit level using analog input (terminals 1, 4) (Pr.810 = "1", Pr.858,
Pr.868)
• The torque is limited with the analog input of terminal 1 or terminal 4. (External torque limit)
Setting
Initial value
range
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 1 or terminal 4 is valid.
The torque limit through the CC-Link (FR-A8NC) or CC-Link IE Field Network (FR-A8NCE/
FR-A800-GF) communication is valid.
Forward
driving
quad1 Forward
(Pr.22) rotation
Speed
quad2
Forward
regeneration
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
Description
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 status
IM
Encoder
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
237