Setting Electronic Thermal For The Motor - Hitachi WJ Series User Manual

Chapter 8
8.1.4

Setting Electronic Thermal for the Motor

 How to set the thermal protection of the motor?
Q
 How to change the motor thermal protection level according to the rated current?
 How to provide protection considering the cooling characteristics of the motor at low speed
with a self-cooled motor, etc.?
 How to freely change the thermal protection characteristics pattern?
 How to set the heat dissipation characteristics according to the motor?
 How to continue motor protection by accumulating the load ratio even when restarting after
power-off?
 How to know the accumulated status of electronic thermal?
A Basic characteristics of electronic thermal
 The electronic thermal function protects the motor from overheating based on the output
current, output frequency and electronic thermal characteristics. By setting the "Electronic
thermal level [b012]
exceeding the rated current continues to flow to the motor. If you want to apply protection
earlier, set it lower than the motor rated current.
 The basic characteristics (time-limited characteristics) of the electronic thermal changes with
the setting of "Load type selection [b049]". Each basic characteristics (time-limited
characteristic) is shown in the figure below.
 By setting "Electronic thermal characteristic selection [b013]
characteristics (reduction ratio according to operating frequency) according to the motor to be
used. For details, refer to the following pages.
 If the motor current becomes unstable due to disturbance, etc., the motor may trip earlier than
the specified time.
Mandatory Setting for Motor Drive and Test Run
*1
" according to the motor rated current, protection is applied if a current
8-1-7
*1 ", it is possible to set the