WEG CFW-09 User Manual page 140

[Factory Setting]
Parameter
Range
Unit Description / Notes
Torque limitation settings
The torque can be limited as follows:
1. Through parameters P169/P170 (by using the keypad, the Serial
Wegbus protocol or the Fieldbus protocols)
2. Through AI2 (P237 = 2 - Maximum torque current)
3. Through AI3 (P241 = 2 - Maximum torque current)
Notes:
The motor current shall be equivalent to the CFW-09 inverter current so
that the torque control can achieve its best precision.
The Sensorless Control (P202 = 3) does not work with torque limitation
at frequencies lower than 3 Hz. Use the Vector with Encoder Control
(P202 = 4) for applications that require torque limitation at frequencies
lower than 3 Hz.
The torque limitation (P169/P170) shall be greater than 30 % in order to
guarantee the motor start in the Sensorless Mode (P202 = 3). After the
motor has started and it is running above 3 Hz, the torque limitation
value (P169/P170) may be reduced below 30 %, if required.
The motor torque (Tmotor) can be calculated from the value at P169/
P170 by using the following equation:
where:
Tmotor - Percentage value of the rated motor torque.
Nrated = Motor synchronous speed
N = Motor actual speed
*
The above equation is valid for forward torque. To reverse torque, replace
P169 by P170.
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION


P

 P 295


T motor


 

2


P 401 P




1 for N Nrated
 


K
Nrated P 180


for


N 100


169 *

K 
100


100

2

P 178



410

100 

N Nrated
141