WEG CFW-09 - Page 140

141
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
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. ThroughAI2 (P237 = 2 - Maximum torque current)
3. ThroughAI3 (P241 = 2 - Maximum torque current)
Notes:
The motor current shall beequivalent to theCFW-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) maybe 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
*
Theaboveequationisvalidforforwardtorque.Toreversetorque,replace
P169 by P170.


100
100
178
P
410
P
401
P
K
100
*
169
P
295
P
motor
T
2
2





































Nrated
N
for
100
180
P
N
Nrated
Nrated
N
for
1
K