Contents

Improving the Operation Performance
•Starting Torque Compensation Function (C4-03 to C4-05)
A starting torque compensation can be applied to speed up the torque establishment at start in Open Loop Vector
control.
It works like shown in the following diagram.
Forward (Reverse) Run command
ON
OFF
Time constant: C4-05
Torque compensation
volume
C4-05 x 4
Time constant: C4-02
C4-03 (forward)
C4-04 (reverse, negative polarity)
E1-09
Output frequency E1-09
Fig 5.40 Time Chart for Starting Torque Frequency
When this function is used, the following should be considered:
• Both values, C4-03 and C4-04 have to be set.
• The compensation works for motoring operation only. It can not be used for regenerative operation.
• If the starting torque compensation is used and a large shock is generated at the start, increase the starting
torque compensation time constant (C4-05)
• The function can be not be used unrestricted for elevators, since the load is not know before the start.
5
Automatic Speed Regulator (ASR) (Closed Loop Vector only)
In Closed Loop Vector control the automatic speed regulator (ASR) adjusts the torque reference in order to
eliminate the deviation between the speed reference and the measured speed (PG feedback).Fig 5.1 shows the
ASR structure.
C5-01/03/09
Frequency
Reference
Motor
Speed
+
-
P
I
C5-02/04/10
C5-08
I-Limit
+
+
Delay
Timer
C5-06
Torque
Limits
Torque
Reference
Fig 5.1 ASR Structure Block Diagram
•Related Parameters
Parameter
No.
Name
Factory
Setting
Change
during
Operation
V/f
Control Methods
Open
Loop
Vector
C5-01 ASR proportional (P) gain 1 40.00 Yes No No A
C5-02 ASR integral (I) time 1 0.500 s Yes No No A
C5-03 ASR proportional (P) gain 2 20.00 Yes No No A
C5-04 ASR integral (I) time 2 0.500 s Yes No No A
C5-06 ASR delay time 0.004 s No No No A
C5-08 ASR integral limit 400% No No No A
C5-09 ASR proportional (P) gain 3 40.00 Yes No No A
C5-10 ASR integral (I) time 3 0.500 s Yes No No A
Closed
Loop
Vector
5-29