Saving An Overload Integral Value At Power Off: F632: Electronic Thermal Memory Target; Overload Pre-Alarm Output - Toshiba TOSVERT VF-AS3 Instruction Manual

• In the default setting, when inverter overload occurs, the inverter is designed to suppress the
overload trip "OL1" or overcurrent trips "OC1 through OC3" by automatically decrease the carrier
frequency. A lower value of the carrier frequency increases the acoustic noise from the motor but
does not affect the performance. When you do not want to lower the value of the carrier frequency,
set <F316: Carrier frequency control> to "0: No decrease". (Refer to [6. 14].)
• The overload detection level depends on the output frequency or carrier frequency.
■ Saving an overload integral value at power off : <F632: Electronic thermal
memory target>
Set a target to reset the integral value of overload at power off. It applies to both the motor electronic
thermal and overload detection for inverter protection.
Title
F632
4
5 0: No.1 to 4 motor, memory disabled
2: No.1 motor, memory disabled
Reset the integral value. "0" applies to No.1 to 4 motors and "2" to the No.1 motor only.
1: No.1 to 4 motor, memory enabled
3: No.1 motor, memory enabled
For memory enabled, the overload integral values of the motor and inverter are saved at power off.
When power supply is ON again, the calculation process is resumed from the state when it is
powered off.
However, with the RTC enabled (with operation panel), the subtraction process is performed
9
according to virtual cooling curves, regardless of the setting.

■ Overload pre-alarm output

When the motor overload level reaches the setting value (%) of <F657: Overload alarm level> for
the overload trip "OL2" integral value, "L" appears. Also, an overload pre-alarm signal can be output
from the output terminal. For details, refer to [7. 2. 2].
Title
F657
5. [Fundamental operation] How to use parameters
Parameter name
Electronic thermal
memory target
Parameter name
Overload alarm level
Adjustment range
0: No.1 to 4 motor, memory disabled
1: No.1 to 4 motor, memory enabled
2: No.1 motor, memory disabled
3: No.1 motor, memory enabled
Adjustment range
10 - 100
5-18
E6582062
Default setting
0
Default
Unit
setting
% 50