E6581301

5.14Setting the electronic thermal

￿￿￿￿: Motor electronic thermal protection level 1

￿￿￿￿: Electronic thermal protection characteristic selection

￿￿￿￿￿: OL reduction starting frequency

￿￿￿￿￿: Motor 150%-overload time limit

￿￿￿￿￿: Temperature detection

Function

This parameter allows selection of the appropriate electronic thermal protection characteristics according to the particular rating and characteristics of the motor.

 

 

[Parameter setting]

 

 

 

 

 

 

 

 

 

 

 

 

Title

Function

 

 

 

 

Adjustment range

 

Default setting

 

 

 

Motor electronic

 

 

 

 

 

 

 

 

 

 

 

￿￿￿￿

thermal

 

￿￿~￿￿￿ %

 

 

 

 

 

￿￿￿

 

 

 

protection level 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

Motor type

 

 

Overload

Overload stall

 

 

 

 

 

 

 

setting

 

 

protection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿￿

 

 

 

￿ (protect)

× (No stall)

 

 

 

 

Electronic

 

 

￿￿

Standard

 

 

￿ (protect)

￿ (stall)

 

 

 

 

thermal

 

 

 

 

 

5

 

￿￿￿￿

 

 

￿￿

Motor

 

 

× (No Protection)

× (No stall)

￿￿

 

protection

 

 

 

 

 

 

 

￿￿

 

 

 

× (No Protection)

￿ (stall)

 

 

characteristic

 

 

 

 

 

 

 

 

 

 

 

￿￿

VF

 

 

￿ (protect)

× (No stall)

 

 

 

 

selection

 

 

 

 

 

 

 

 

 

 

￿￿

Motor

 

 

￿ (protect)

￿ (stall)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿￿

(special

 

 

× (No Protection)

× (No stall)

 

 

 

 

 

 

 

 

￿￿

motor)

 

 

× (No Protection)

￿ (stall)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1) Setting the motor electronic thermal protection level 1

￿￿￿

and electronic thermal protection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

characteristics selection

 

￿￿￿

 

 

 

 

 

 

 

 

The electronic thermal protection characteristics selection ￿￿￿ is used to enable or disable the motor overload trip function (￿￿￿) and the overload stall function.

The motor overload trip function (￿￿￿) needs to be selected with the parameter ￿￿￿, while the inverter overload trip function (￿￿￿) is always activated.

Explanation of terms:

Overload stall (Soft stall)

The function of automatically lowering the output frequency before the motor overload trip function

￿￿￿is activated when the inverter detects that an excessive load is applied to the motor. (Lowers maximum about 48Hz when basic frequency is 60Hz.) This function enables the inverter to output a frequency commensurate with the load current so that the motor can keep running without tripping. This function is useful for such loads as fans, pump, and blowers, which have the square reduction torque characteristic that the current passed decreases as the rotating speed falls.

Note:Do not use this overload stall function for loads with a constant torque characteristic (e.g., a belt conveyer to which a constant load current is always passed regardless of their speed).

[Using standard motors (other than motors intended for use with inverters)]

When a motor is used in the lower frequency range than the rated frequency, that will decrease the cooling effects for the motor. This speeds up the start of overload detection operations when a standard motor is used in order to prevent overheating.

Setting of electronic thermal protection characteristics selection ￿￿￿

 

Default setting

Overload protection

Overload stall

 

 

￿￿

￿ (protect)

× (No stall)

 

 

￿￿

￿ (protect)

￿ (stall)

 

 

￿￿

× (No Protection)

× (No stall)

 

 

￿￿

× (No Protection)

￿ (stall)

 

 

 

 

 

 

 

 

 

E-22

Page 92
Image 92
Toshiba VF-AS1 instruction manual Setting the electronic thermal, Explanation of terms