Toshiba VT130G1 User Manual

Page 31

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Section 6

Note: If acce eration/deceleration is performed with a short preset rate and high

inertia, OC (over current), or over voltage/potential (OP) protection circuit
may be activated. If the fault signal relay is activated, check the cause
and take necessary action such as increasing the accel/decel rates.

d) Motor coast stop and controlled stop

Coast stop or controlled stop is determined by the input signal to ST or STI

terminal. Opening MC AUX. gives coast stop, otherwise unit will go through
controlled (programmed) stop.

DRIVE
switch

orR

^ ST (STI)

COM

DRIVE

switch

Spssd

Conirotsd

stop

Cosst

stop

Switching between commercial power source and inverter output. (Bypass)

Power

MC2 must be provided in order

to protect the transistors in the

Inverter unit from damage.
MC2 and MC3 must be equipped

with mechanical interlock (reversing

contactors).

Protection circuit may be activated when
switching from commercial power to
inverter while the motor is spinning.

MCI

MC2

MC3

Switching sequence

Parallel motor operation

• The total current of the motors must not

exceed the rated current of the inverter.

• Add a thermal relay for each motor for

overload protection.