4-118
4-2 Function Mode
4
Functions
Note 1:
Make sure that the carrier frequency (b083) is not lower than 2.1 kHz. If the carrier frequency is at 2.1 kHz
or lower, the Inverter does not operate normally.
Note 2: Set a torque limit value (b041 to b044), while keeping the value , calculated with the following formula,
at 200% or lower. Otherwise, the motor may burn out.
= Torque limit set value × (Inverter capacity) / (Motor capacity)
(Example) If the Inverter capacity is 0.75 kW and the motor capacity is 0.4 kW, the torque limit set value for =
200%, calculated with the above formula, is as follows: Torque limit set value (b041 to b044) = ×
(Motor capacity) / (Inverter capacity) = 200% × (0.4 kW)/(0.75 kW) = 106%
Torque Monitor Function
•This function allows you to monitor an estimated motor output torque, when "sensorless vector
control", "0-Hz sensorless vector control", or "sensor vector control" is selected as the control
method.
•To use the monitor via the Digital Operator, select display code d012.
•To use the monitor with a signal from the control terminal block, refer to "Digital FM Terminal" (page
4-109) or "Analog Output AM/AMI Terminals" (page 4-110).
•If "VC", "special VP", or "free V/f setting" is selected in V/f characteristics selection A044/A244, this
function is disabled, and the display or the output signal from the control terminal block is not
defined.
•For a torque monitor value of this function, the output torque at the rated frequency equivalent to
the motor's output rating during synchronous rotation is indicated as 100%.
•Since this function estimates output torque based on the motor current, the accuracy is approx.
20% when a motor with the same output capacity as the Inverter is used.
Parameter No. Function name Data Default setting Unit
A044/A244
V/f characteristics
selection
03: SLV (Sensorless vector control)
04: 0SLV (0-Hz sensorless vector control)
05: V2 (Sensor vector control)
00
C027
C028
C029
FM selection
AM selection
AMI selection
02: Output TRQ (Output torque)
11: Out TRQ sign (Output torque (signed))
(C028 only)
00
H003/H203 Motor capacity selection 0.20 to 160.0 Factory default kW
H004/H204
Motor pole number
selection
2/4/6/8/10 4 Pole
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