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2-3

 Circuit Descriptions

Refer to the numbers indicated in Fig 2.1.

1 These circuits are hazardous and are separated from accessible surfaces by protective separation

2 These circuits are separated from all other circuits by protective separation consisting of double and

reinforced insulation. These circuits may be interconnected with SELV

(or equivalent) or non-

SELV

circuits, but not both.

3 Inverters supplied by a four-wire-system source (neutral grounded)

These circuits are SELV

circuits and are separated from all other circuits by protective separation

consisting of double and reinforced insulation. These circuits may only be interconnected with

other SELV

(or equivalent) circuits.

Inverters supplied by a three-wire-system source (ungrounded or corner grounded)

These circuits are not separated from hazardous circuits other circuits by protective separation, but

only with basic insulation. These circuits must not be interconnected with any circuits which are

accessible, unless they are isolated from accessible circuits by supplemental insulation

* SELV (Safety Extra Low Voltage) circuits have no direct connection to the primary power and are supplied by a transformer or equivalent isolating

device. The circuits are designed and protected, so that, under normal and single fault condition, its voltage does not exceed a safe value.

(See IEC 61010)

IMPORTANT

1. Control circuit terminals are arranged as shown below.

2. The output current capability of the +V terminal is 20 mA.

3. Main circuit terminals are indicated with double circles and control circuit terminals are indicated with sin-

gle circles.

4. The wiring of the digital inputs S1 to S7 and BB is shown for the connection of contacts or NPN transis-

tors (0V common and sinking mode). This is the default setting.

For the connection of PNP transistors or for using a 24V external power supply, refer to

Table 2.10.

5. A DC reactor is an option only for Inverters of 18.5 kW or less. Remove the short circuit bar when con-

necting a DC reactor.

SC SC SC

A1 AC

E(G)

S3 S4

S5 S6 S7 BB1

MA MB MC

E(G)

Omron VARISPEED L7 User Manual

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