Yaskawa Varispeed-686SS5 CIMR-SSA User Manual

Page 24

WIRING

Inverter can be used without a magnetic contactor (MC) installed at the power supply side.
When the main circuit power supply is shut OFF in the sequence, a magnetic contactor (MC)
can be used instead of a molded-case circuit breaker (MCCB). However, when a magnetic
contactor is switched OFF at the primary side, regenerative braking does not function and
the motor coasts to a stop.

The load cannot be operated/stopped by opening/closing the magnetic contactor at the
power supply side.

When using a braking resistor unit, use a sequencer to break power supply side on over-
load relay trip contact. If the inverter malfunctions, the braking resistor unit may be
burned out.

(d) Terminal Block Connection Sequence

Input power supply phases can be connected to any terminal regardless of the order of R,
S and T on the terminal block.

(e) Installation of Reactor

When connecting an inverter (200V/400V 15kW or less) to a large capacity power supply
transformer (600kVA or more), or when switching a phase advancing capacitor, exces-
sive peak current flows in the input power supply circuit, which may damage the converter
section. In such cases, install a DC reactor (optional) between inverter ¨1 and ¨2 termi-
nals or an AC reactor (optional) on the input side. Installation of a reactor is effective for
improvement of power factor on the power supply side.

(f) Installation of Surge Suppressor

For inductive loads (magnetic contactors, magnetic relays, magnetic valves, solenoids,
magnetic brakes, etc.) connected near the inverter, use a surge suppressor simultaneously.

(g) Prohibition of Installation of Phase Advancing Capacitor

If a phase advancing capacitor or surge suppressor is connected in order to improve the
power factor, it may become overheated and damaged by inverter high harmonic compo-
nents. Also, the inverter may malfunction because of overcurrent.

(h) Using Input Noise Filters

Noise filters can reduce a higher harmonics noise leaking from the drive unit to the power
line.

Example 1

MCCB

VS-686SS5

Use an exclusive noise filter
specified for the inverter.

Power

Supply

Other

Control

Device

Noise

Filter

Fig.

8 Using Input Noise Filter (Example 1)