User`s manual

6-2
6
Application and Overload Selections
 Select the Overload to Suit the Application
Set C6-01 (Heavy Duty: constant torque, Normal Duty: High carrier, variable torque) depending on the appli-
cation. The setting ranges for the Inverter carrier frequency, overload capability and maximum output fre-
quency depend on the setting of C6-01. For applications like fans and blowers (quadratic torque characteristic)
set C6-01 to 1 or 2 (Normal Duty 1 or 2). For applications with a constant torque characteristic set C6-01 to 0
(Heavy Duty).
Related Parameters
Difference Between Heavy Duty and Normal Duty
The characteristics of Heavy Duty (constant torque) and Normal Duty (variable torque) are shown below.
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
C6-01 Heavy/Normal Duty selection 0 No QQQQ
C6-02 Carrier frequency selection 1 No QQQQ
C6-03 Carrier frequency upper limit 2.0 kHzNo AAAA
C6-04 Carrier frequency lower limit 2.0 kHz No A A No No
C6-05 Carrier frequency proportional gain 00 No A A No No
Heavy Duty / Constant Torque Normal Duty / Variable Torque
Constant torque means a constant load torque for all motor
speed. Typical applications are pushers, conveyors, cranes, and
other high friction or heavy loads. These applications may
require overload capability.
Variable torque means that the load torque will increase as the
speed increases. Typical applications are fans and pumps. Nor-
mally not much overload capability is required.
Constant Torque
Torque
Motor speed
Variable Torque
Torque
Motor speed