Troub le shoot in g and maint enance – Hitachi L100 User Manual

Page 137

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Maintenance and Inspection

T

roub

le

shoot

in

g

and Maint

enance

6–12

The figures below show measurement locations for voltage, current, and power measure-
ments listed in the table on the previous page. The voltage to be measured is the funda-
mental wave effective voltage. The power to be measured is the total effective power.

Conduct the insulation resistance test by short circuiting the terminals as shown below.

CAUTION: Never test the withstand voltage (HIPOT) on the inverter. The inverter has a
surge protector between the main circuit terminals above and the chassis ground.

E

1

W

1

I

1

I

1

I

1

I

1

E

U-V

E

U-V

E

U-V

W

01

W

02

INVERTER

MOTOR

L

1

N

U/T1

V/T2

W/T3

L

1

N

Single-phase measurement diagram

E

1

I

1

I

1

I

1

I

1

E

U-V

E

U-V

E

U-V

W

01

W

02

INVERTER

MOTOR

L1

N

U/T1

V/T2

W/T3

L1

N

Three-phase measurement diagram

W

01

W

02

E

1

E

1

I

2

I

3

L2

U

V

W

Meg ohm meter

L1

L2

L3

U

V

W

RB +1

+

–

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