Starting Torque Compensation - YASKAWA Varispeed G7 Series Instruction Manual

Normally, there is no need to make this setting. Adjust the constant as shown below.
If the motor is vibrating, increase the set value.
•
If the motor response is low, decrease the set value.
•


Starting Torque Compensation

Starting torque compensation can be input during open-loop vector control to increase the torque reference
even faster when starting the motor.
Starting torque compensation is effective when starting torque is required for machines with a high frictional
load and cranes. However, starting torque compensation differs from flux vector control in that compensation
is provided only when starting the motor.
Related Constants
Constant
Number
C4-03
C4-04
C4-05
Master speed reference
Forward (reverse) run
command (S1 (S2))
Time constant: C4-05
Torque compensation
Output frequency
When using this function, set the starting torque compensation amount to the frictional load for a normal
•
machine or to the load for an elevating machine, such as a crane.
Frictional load: Set both C4-03 and C4-4 to the amount of friction.
•
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6
Name
Description
Display
Forward start-
Sets the forward start-
ing torque
ing torque as a percent-
age of the motor rated
F TorqCmp@
torque.
start
Reverse start-
Sets the reverse starting
ing torque
torque as a percentage
of the motor rated
R TorqCmp@
torque.
start
Sets the delay time in
Starting torque
ms for the starting
time constant
torque.
The filter is disabled if
TorqCmp
the time is set to 0 to 4
Delay T
ms.
(A1)
Open
Time constant:
C4-02
amount
C4−05 × 4
E1−09
Note The above torque compensation amount lower limit is applied to the Inverter's torque reference value.
Fig 6.34 Starting Torque Compensation Timing Chart
Change
Fac-
Setting during
tory
Range Opera-
V/f
Setting
tion
0.0 to
0.0% ×
200.0
-200.0
0.0% ×
to 0.0
0 to
10 ms ×
200
Closed
C4-03 (forward) C4-03 (forward) C4-03 (forward)
C4-04 (reverse, negative polarity) C4-04 (reverse, negative polarity) C4-04 (reverse, negative polarity)
Control Methods
V/f Open- Open-
Flux
with Loop Loop
Vector
PG Vector 1 Vector 2
× × A × ×
× × A × ×
× × A × ×
Larger of b2-01 and E1-09
MEMO-
BUS
Page
Regis-
ter
217H –
218H –
219H –