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E6580757
J-4
10
10.3 Installation of an overload relay
1) The VF-S9 inverter has an electronic-thermal overload protective function. In the following cases, however,
the activation level of the electronic thermal protection unit must be adjusted and an overload relay suitable
for the motor installed between the inverter and the motor.
• When using a motor with a current rating different to that of the corresponding Toshiba general-purpose
motor
• When operating a single motor with an output smaller than that of the applicable standard motor or more
than one motor simultaneously
2) When using the VF-S9 inverter to operate a constant-torque motor, such as the Toshiba VF motor, adjust
the protection characteristic of the electronic thermal protection unit to the VF motor use.
3) It is recommended to use a motor with a thermal relay embedded in the motor coil to give sufficient protec-
tion to the motor, especially when it runs in a low-speed range.
10.4 Optional external devices
The following external devices are optionally available for the VF-S9 series of inverters.
Non-fuse circuit
breaker MCCB
Power supply
Magnetic
contactor MC
Input AC
reactor (ACL)
High-attenuation
radio noise filter
Zero-phase reactor
ferrite core-type radio
noise filter
Foot-mounted
noise filter
N.F
VF-S9
DC reactor
Braking
resistor
N.F
IM
Zero-phase reactor
ferrite core-type radio
noise filter
Motor -end surge
voltage suppression
filter (for 400V
models only)
Motor
(4)
(7)
(3)
(4)
(5)
(2)
(6)
(1)