Manual Torque Boost - Omron 3G3MX2 User Manual

"A" Group: Standard Functions
102
quency setting (
free-setting V/F frequency 7 (
Output voltage (V)
V7 ( b113)
V6 ( b111)
V5 ( b109)
V4 ( b107)
V1 ( b101)
V2,3 ( b103,b105)
Item
Free V/f frequency 7
Free V/f frequency 6
Free V/f frequency 5
Free V/f frequency 4
Free V/f frequency 3
Free V/f frequency 2
Free V/f frequency 1
Free V/f voltage 7
Free V/f voltage 6
Free V/f voltage 5
Free V/f voltage 4
Free V/f voltage 3
Free V/f voltage 2
Free V/f voltage 1
*1
Even if the voltage higher than input is set as a free-setting V/F voltage 1 to 7, the inverter output voltage cannot exceed
the inverter input voltage or that specified by the AVR voltage selection. Carefully note that selecting an inappropriate
control system (V/F characteristics) may result in overcurrent during motor acceleration or deceleration or vibration of the
motor or other machine driven by the inverter.

Manual Torque Boost -

The Constant and Variable
Torque algorithms feature
an adjustable torque boost
curve. When the motor
load has a lot of inertia or
starting friction, you may
need to increase the low
frequency starting torque
characteristics by boost-
ing the voltage above the
normal V/f ratio (shown at right). The function attempts to compensate for volt-
age drop in the motor primary winding in the low speed range.
The boost is applied from zero to the base frequency. You set the breakpoint
of the boost (point A on the graph) by using parameters
manual boost is calculated as an addition to the standard V/f curve.
Be aware that running the motor at a low speed for a long time can cause
motor overheating. This is particularly true when manual torque boost is ON,
or if the motor relies on a built-in fan for cooling.
 
/ ) automatically. (The inverter regard the value of

) as the maximum frequency.)
0
F1 F2 F3
(b100) (b102) (b104)
Code Set range
b112 0 to 400 (Hz)
b110 Free-setting V/F freq.5 to freq.7 (Hz)
b108 Free-setting V/F freq.4 to freq.6 (Hz)
b106 Free-setting V/F freq.3 to freq.5 (Hz)
b104 Free-setting V/F freq.2 to freq.4 (Hz)
b102 Free-setting V/F freq.1 to freq.3 (Hz)
b100 0 to Free-setting V/F freq.2 (Hz)
b113 0.0 to 800.0 (V)
b111
b109
b107
b105
b103
b101
A042 = 5 (%)
100%
5% voltage
boost
(100%=A082)
Section 3-5
Output freq.(Hz)
F4 F5 F6 F7
(b106) (b108) (b110) (b112)
Setting of the out-
put freq. at each
breakpoint of the
V/F characteristic
curve
Setting of the out-
put voltage at each
breakpoint of the
V/F characteristic
curve
V
A
0
1.8 Hz 30 Hz
A043 = 3 (%)

and
Remarks
*1
Hz
fbase =
60 Hz

. The