Wiring Diagram; Insulation Tests; No-Load Current Value - Hitachi G 18ST Service Manual

Fig. 10

• Wiring diagram

Power source
On completion of disassembly and repair, measure the insulation resistance, and conduct the dielectric
strength test.
Insulation resistance: After the switch is turned on, more than 10 M
between live parts and accessible metal parts.
Dielectric strength: After the switch is turned on, there must be no trouble when the voltage indicated
below is provided between live parts and accessible metal parts.
Less than 150 V of the rated voltage: 3,000 V x 3 sec.
More than 150 V of the rated voltage: 4,400 V x 3 sec.
After no-load operation for 30 minutes, the no-load current value should be as follows.
Voltage 110 V
Current max. 7.2 A
Wiring diagram
Switch
Condensor ass'y
(0.22 F)

Insulation tests

No-load current value

120 V 127 V
5.7 A 6.0 A
-7-
Field coil
Field coil
by 500 V DC megohm meter
220 V 230 V
3.7 A 3.9 A
240 V
3.2 A