Toshiba Tosvert VF-S15 Instruction Manual page 99

Note 1: If the load applied to the inverter 150% or more of its rated load or the operation frequency is 0.1Hz or
less, the inverter may trip (ol1 or oc1 to oc3) in a shorter time.
Note 2: The inverter is default setting so that, if the inverter becomes overloaded, it will automatically reduce the
carrier frequency to avoid an overload trip (ol1 or oc1 to oc3). A reduction in carrier frequency
causes an increase in noise from the motor, but this does not affect the performance of the inverter.
If you do not want the inverter to reduce the carrier frequency automatically, set the parameter
f316=0.
Note 3: Overload detection level is variable by condition of output frequency and carrier frequency.
4) Electronic thermal memory f632
When the power is OFF, it is possible to reset or maintain the overload totaling level.
This parameter's settings are applied both to the motor's electronic thermal memory and the electronic
thermal memory for inverter protection.
[Parameters settings]
Title Function
Electronic thermal memory
f632
● f632=1 is a function for complying with the U.S. NEC standards.
5) Overload alarm level f657
When the motor overload level reaches to f657 setting value (%) of overload trip (ol2) level, "l" will be
displayed on the left side digit and the "l" and output frequency monitor will be blinking alternately on
overload alarm status.
Overload alarm signal can be output from output terminal.
[Parameters settings]
Title Function
Overload alarm level
f657
[Example of setting]: Assigning the overload alarm to the OUT terminal.
Title Function
Output terminal selection 2A (OUT)
f131
17 is reverse signal.
Adjustment range
0: Disabled (thr, f173)
1: Enabled (thr, f173)
2: Disabled (thr)
3: Enabled (thr)
Adjustment range
10-100 (%)
Adjustment range
0-255
E-13
E6581926
5
Default setting

Default setting
50
Setting
16: POL