Performing High-Accuracy, Fast-Response Control - Mitsubishi Electric FR-F820-04750 Instruction Manual

Speed control under PM motor control
NOTES To change to the PM motor control, perform PM parameter initialization at first. If parameter ini-
tialization is performed after setting other parameters, some of those parameters will be initialized
too. (Refer to page 5-48 for the parameters that are initialized.)
Constant-speed operation cannot be performed in the low-speed range of 150 r/min or less.
During PM motor control, the RUN signal is output about 100 ms after turning ON the start com-
mand (STF, STR). The delay is due to the magnetic pole detection.
During PM motor control, the automatic restart after instantaneous power failure function oper-
ates only when an MM-EFS or MM-THE4 IPM motor is connected.
When a regeneration unit is used, the frequency search may not be available if the rotation speed
is about 10% higher than the rated speed.
5.3.2 Performing high-accuracy, fast-response control (gain adjustment for PM
motor control)
Manual gain adjustment is useful for achieving optimum machine performance or improving unfa-
vorable conditions, such as vibration and acoustic noise during operation with high load inertia or
gear backlash.
Pr.
820
G211
821
G212
824
G213
825
G214
830
G311
831
G312
834
G313
835
G314
5 - 52
PM PM PM
Name
Speed control P gain 1
Speed control integral time
1
Torque control P gain 1
(current loop proportional
gain)
Torque control integral
time 1 (current loop
integral time)
Speed control P gain 2
Speed control integral time
2
Torque control P gain 2
Torque control integral
time 2
Initial Setting
Description
value range
The proportional gain during speed control is set.
(Setting this parameter higher improves the
25% 0 to 1000% trackability for speed command changes. It also
reduces the speed fluctuation caused by external
disturbance.)
The integral time during speed control is set. (Setting
this parameter lower shortens the return time to the
0.333 s 0 to 20 s
original speed when the speed fluctuates due to
external disturbance.)
50% 0 to 500% The proportional gain of the current controller is set.
40 ms 0 to 500 ms The integral time of the current controller is set.
Second function of Pr. 820 (valid when RT signal is
0 to 1000%
ON)
9999
9999 The Pr. 820 setting is applied to the operation.
Second function of Pr. 821 (valid when RT signal is
0 to 20 s
ON)
9999
9999 The Pr. 821 setting is applied to the operation.
Second function of Pr. 824 (valid when RT signal is
0 to 500%
ON)
9999
9999 The Pr. 824 setting is applied to the operation.
Second function of Pr. 825 (valid when RT signal is
0 to 500 s
ON)
9999
9999 The Pr. 825 setting is applied to the operation.
Parameters