Toshiba Tosvert VF-A5 - Manual (Page 15)

5. Wiring Precautions
5.1 Connection to Main Circuit (Refer to page 11, Fig. 5.1.)
Observe the following precautions when making connections to the inverter.
Confirmation of power OFF:
Electrical shock prevention-
confirmation of charge
dissipation:
Confirmation of main circuit
connections:
Separation of power source
and motor wiring:
Separation of control and
main power supplies:
Always turn the primary power distribution panel switch OFF, and
confirm with a tester that a voltage is not present before beginning
wiring to the inverter.
Before changing the wiring, wait at least five minutes after the
•CHARGE“ lamp inside the inverter has gone out, and then confirm
that the capacitors have fully discharged by using a tester, etc., that
can measure high-voltage DC. The internal electrolytic capacitors are
charged, and there is a danger of electrical shock If the charged
areas are touched while the "CHARGE' lamp is on. Do not touch the
terminal block or remove the upper cover while the lamp is lit
The inverter will be damaged If the input power source is applied to
the motor terminals (U/T1, V/T2, W/T3). Always confirm the wiring for
the power source terminals (R/L1, S/L2, T/L3) and motor terminals
(U/T1, V/T2, W/T3) before turning the power on.
To prevent problems due to radio-frequency noise, etc., do not bundle
the wiring to the input power terminals (R/L1, S/L2, T/L3) and the
motor terminals (U/T1, V/T2, VJfTS) together.
In order to maintain the control power supply to display faults or to
operate the communication options while the main circuit power is
shut down, remove the two shorting bars (between R/L1-R0, S/L2-S0)
on the control power supply terminal block. Connect the control
power to a power source that is separate from the main circuit supply.
5.2 Connection of Control Signals
Observe the following points when making control signal connections.
Rating of relay contacts:
Power wiring for control
circuit:
Control wiring wire sizes:
Isolation from main circuit:
Use a relay intended for use with micro-current (min. applicable load
rating less than 4mA-24V.), and install a surge killer on the relay’s
exciting coil.
Use shielded wiring or twisted-pair wiring for the control circuit, and
separate the wiring from the main circuit wiring.
The following wiring sizes for the control circuit are recommended.
Frequency setting signal input, frequency meter, ammeter: shielded
wire that is 0.3mm® or larger
Other signals: Vinyl-insulated wire that is 0.75mm® or larger
All control terminals other than FLA, FLB and FLC are connected to
Internal electronic circuits, so input signals must always be electrically
isolated from the main circuit.
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