Hitachi SJ700D-004L, Instruction Manual

Page: 67 / 288

Chapter 3 Operation
3-22
3.6 Dual rating selection
The SJ700D-3 series inverter has Dual Rating, so that it can work in two different types
of load condition, Constant torque application and Variable torque application. Select
parameter b049 depending on your application.
Name Function code Data Description
Dual rating selection b049
00 CT : Constant Torque
01 VT : Variable Torque
- The rating of Constant Torque mode (CT) is same as SJ700-2 series.
Overload current characteristic is 150% current / 60 seconds.
- You can use Variable Torque mode (VT), in case the motor works with over rating torque infrequently.
When you select VT mode, rated current specification is changed up into VT mode larger than CT mode,
you can choose the one size bigger capasity motor than the inverter capacity.
Note, overload current characteristic is 120% current / 60 seconds.
- You can set CT mode or VT mode to change b049 without power cutting off.
Heavy load (CT) Normal load (VT)
Usage
For heavy load with high torque required
at start, acceleration and deceleration. For nomal road without high torque
required.
Applications Elevators, cranes, conveyers, etc. Fans, pumps, air-conditionings,etc
Rated current
(example)
46.0A (3-phase 200V 11.0kW) 58.0A (3-phase 200V 11.0kW)
Overload current 150% 60 sec 120% 60 sec
- When you change to CT mode or VT mode at b049, setting range and an initial value of some parameters change,
and someparameters are initialized. You need to set some Initialized parameters with setting b049.
b049: Dual rating selection
Related code