Omron SYSDRIVE 3G3RV Series User Manual page 219

nDifference between CT and VT
The characteristics of CT (low carrier, constant torque) and VT (high carrier, variable torque) are shown
below.
CT: Low Carrier, Constant Torque
Constant Torque
Torque
0 Motor speed
Constant torque means a fixed load torque for all motor
speed, and it requires overload resistance capability.
Applications include pushers, conveyors, cranes, and
other friction or heavy loads.
Low carrier: Acoustic noise is present.
nSetting Precautions
C6-01 (CT/VT Selection)
When setting C6-01, observe the following precautions.
Depending on the set value in C6-01, the setting range of the related parameters is limited as follows:
•
C6-01 Set Value
Inverter Overload Protection Level
C6-02 (Carrier Frequency Selection)
E1-04 and E3-02 (Max. Output Fre-
quency)
L3-02 (Stall Prevention Level During
Acceleration)
L3-06 (Stall Prevention Level During
Operation)
* Factory settings depend on Inverter capacity.
200 V and 400 V Class Inverters for 0.4 to 22 kW: 6 (15 kHz)
200 V Class Inverters for 30 to 90 kW, or 400 V Class Inverters for 30 to 185 kW: 4 (10 kHz)
200 V Class Inverter for 110 kW, or 400 V Class Inverters for 220 to 300 kW: 1 (2 kHz)
When the setting in E1-04 or E3-02 is greater than 150 Hz, if C6-01 is set to 0, an OPE02 (Parameter set-
•
ting range error) will occur.
VT: High Carrier, Variable Torque
Torque
Variable torque means that the load torque will decrease
as the speed decreases. Normally, overload resistance
capability is not required. Applications include fans and
pumps.
High carrier: Acoustic noise is not present.
0 (Low Carrier, Constant Torque)
150% Inverter rated current/1
min.
0: Low carrier, low noise
1: Carrier 2 kHz
150 Hz
150%
150%
Application and Overload Selections
Variable Torque
Motor speed
1 (High Carrier, Variable Torque)
120% Inverter rated current/1
min.
0: Low carrier low noise
1: Carrier 2 kHz
2: Carrier 5 kHz
3: Carrier 8.0 kHz
4: Carrier 10.0 kHz
5: Carrier 12.5 kHz
6: Carrier 15 kHz
F: User-set*
400 Hz
120%
120%
3
6-