Toshiba Tosvert VF-A5 - Manual (Page 17)

Note) A DC reactor (stand-alone type option) can be installed on 5.5kW and larger units. (Refer to the
function of main circuit terminals PO and PA on page 18.)
Installation of non-fuse breaker
(1) Install a non-fuse breaker (MCCB) for wiring protection on the input power source side.
(2) Avoid frequent starting/stopping by turning the non-fuse breaker ON and OFF.
(3) Start and stop by turning terminals F to CC (or R to CC) ON and OFF.
Installation of primary magnetic contactor
(Refer to page 14; Examples of selecting equipment for wiring.)
(1) When using an external braking resistor, install a magnetic contactor (MC) or non-fuse breaker with
trip coil (MCCB) on the inverter's power supply input side for protection. Make sure that the power
circuit can be opened with the built-in fault detection relay (FL).
(2) The VF-A5 has a built-in fault detection relay (FL). Connect the contacts of this relay to the primary side
magnetic contactor (MC) operation terminals, so that the MC can be opened when the inverter’s
protection circuit functions.
The fault detection relay (FL) contacts (250VAC-1A cos0=O.4) can be directly connected on 200V
systems. When using a 400V system, a transformer must be used to create 200V or less for the FL
sequence.
If the MC exciting current exceeds the FL contact rating, install another relay step.
(3) Turn terminal F (or R) to CC ON and OFF to frequently start and stop. Due to repeated inrush currents
when the power is turned on, the life of the inverter will be shortened when the primary magnetic
contactor is used to start and stop, so do not use this method to start and stop frequently.
(4) Install a surge killer on the magnetic contactor (MC) exciting coil.
-11