MX2 Quick Start Guide 23
PROGRAMMING MX2
This table shows the details about the Free V/F control
3.10 Torque boost function
Manual torque boost - Constant and Vairable torque algorithms
feature and asjustable torque boost curve that could help during
the startup of load with very big inertia or friction. On those cases
it may be necessary to increase the low frequency starting torque
characteristic by boosting the voltage above the normal V/F ratio.
Basically it attempsts to compensate for voltage drop in the motor
primary winding in the low speed range.
Be aware that running the motor at a low speed for a long time can
cause motor overheating and this is particularly true when manual
torque boost is activated and motor doesn’t have force ventilation.
Automatic torque boost- Use the voltage compensation (A046)
and slip compensation (A047) to obtain a better performance under automatic torque boost mode (A041=01) ajusting the output
frequency and output voltage automatically depending on the load. The output voltage due automatic boost is added to the man-
ual torque boost voltage so both should be adjusted.
Parameter Parameter Name Diagram Range
b100 Free-setting V/F freq(1) 0 to b102(Hz)
b101 Free-setting V/F volt (1) 0.0 to 800.0(V)
b102 Free-setting V/F freq(2) b100 to b104(Hz)
b103 Free-setting V/F volt (2) 0.0 to 800.0(V)
b104 Free-setting V/F freq(3) b102 to b106(Hz)
b105 Free-setting V/F volt (3) 0.0 to 800.0(V)
b106 Free-setting V/F freq(4) b104 to b108(Hz)
b107 Free-setting V/F volt (4) 0.0 to 800.0(V)
b108 Free-setting V/F freq(5) b106 to b110(Hz)
b109 Free-setting V/F volt (5) 0.0 to 800.0(V)
b110 Free-setting V/F freq(6) b108 to b112(Hz)
b111 Free-setting V/F volt (6) 0.0 to 800.0(V)
b112 Free-setting V/F freq(7) 0 to 400.0(Hz)
b113 Free-setting V/F volt (7) 0.0 to 800.0(V)
Parameter Parameter Name Description
A041 Torque boost select Two options:
00... Manual torque boost
01... Automatic torque boost
A042 Manual torque boost value Can boost starting torque between 0 and 20% above normal
V/f curve, range is 0.0 to 20.0%
A043 Manual torque boost frequency Sets the frequency of the V/f breakpoint for torque boost,
range is 0.0 to 50.0%
A044 V/f characteristic curve 00... Constant torque
01... Reduced torque (1.7)
02... Free V/F
03... Sensorless vector (SLV)
A045 V/f gain Sets voltage gain of the inverter, range is 20. to 100.%
A046 Voltage compensation gain for auto-
matic torque boost
Sets voltage compensation gain under automatic torque boost,
range is 0. to 255.
A047 Slip compensation gain for auto-
matic torque boost
Sets slip compensation gain under automatic torque boost,
range is 0. to 255.
Output voltage (V)
b113
b111
b109
b107
b101
b103,b105
0
b100 b102 b104 b106 b108 b110 b112
Output freq.(Hz)
0
A042
= 5 (%)
30 Hz
V
100%
1.8 Hz
A043
= 3 (%)
Hz
A
5% voltage
boost
(100%=A082)
fbase =
60 Hz
I129E-EN-02+MX2+QuickStartGuide.book Seite 23 Mittwoch, 7. November 2012 1:54 13
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