Overload Protection; Motor Thermal Protection - Toshiba Tosvert VF-S15 Instruction Manual

Terminal Input /
symbol output
FLA
FLB
Output
FLC
Note 3)
RY
RC Output
Note 3)
Note 1) When VIA terminal is used as logic input terminal, be sure to connect a resistor between P24 and VIA in case of
sink logic, between VIA and CC in case of source logic. (Recommended resistance: 4.7kΩ-1/2W)
It is not needed for VIB terminal.
Note 2) When STO terminal is used as the safety function, refer to E6581860 "VF-S15 Safety function manual".
Note 3) A chattering (momentary ON/OFF of contact) is generated by external factors of the vibration and the impact, etc. In
particular, please set the filter of 10ms or more, or timer for measures when connecting it directly with input unit
terminal of programmable controller. Please use the OUT terminal as much as possible when the programmable
controller is connected.

4. Overload protection

VF-S15 has overload protection.
Over current rating: 150%-1min. 200%-0.5sec.
Refer to the nameplate for the rated current.

5. Motor thermal protection

The devices VF-S15 are provided with integral overload and over-speed protection for the motor after activation of
this function by setting.
Protection at 100% of the full load motor current.
The motor thermal protection current (th
VF-S15 has the motor thermal protection.
Select the electronic thermal protection characteristics that fit with the ratings and characteristics of the motor.
In case of multi motor operation with one inverter, thermal relay should be connected to each motor.
17
Multifunction programmable relay contact output.
Detects the operation of the inverter's protection function.
Contact across FLA-FLC is closed and FLB-FLC is opened during
protection function operation.
Multifunction programmable relay contact output.
Default settings detect and output low-speed signal output frequencies.
Multifunction output terminals to which two different functions can be
assigned.
thr r r r ) must be set to the rated current indicated on the motor nameplate.
th th
Function
Q-10
E6582175
Electrical
specifications
Max. switching
capacity
250Vac-2A,
30Vdc-2A
(cosφ=1)
: at resistive load
250Vac-1A
(cosφ=0.4)
30Vdc-1A
(L/R=7ms)
Min. permissible
load
5Vdc-100mA
24Vdc-5mA