Insulation Tests - Hitachi W 6VM Technical Data And Service Manual

B. Additional wiring work
General internal wiring can be accomplished by referring to paragraph 8-3 and 8-4-A. The following are special
instructions for switch connection.
(1) Wiring of reversing switch
Insert the lead wire (brown) coming from the
brush holder into the terminal (1) of the reversing
switch, and the lead wire (blue) into the terminal
(2) as shown in Fig. 10. Insert the lead wire
(gray) coming from the stator into the terminal (3)
and the lead wire (red) into the terminal (4). After
insertion, pull each lead wire slightly to check that
the lead wires do not come off. To disconnect the
lead wires, insert a small flat-blade screwdriver
into the slots near the terminals and pull out the
lead wires.
(2) Wiring of variable speed control switch
Insert each cord into the terminal 1 and
terminal 2 of the speed control switch as
shown in Fig. 11, and tighten the screw
[tightening torque: 0.6 _ + 0.2 N
5.2 _ + 1.7 in-lbs.)]. Insert the lead wire (yellow)
coming from the stator into the terminal M1 and
the lead wire (white) into the terminal M2. Insert
each lead wire (white) coming from the noise
suppressor into the terminal C1 and C2. After
insertion, pull each lead wire slightly to check
the lead wires do not come off. To disconnect
the lead wires, insert a small flat-blade
screwdriver into the slots near the terminals and
pull out the lead wires.

8-5. Insulation Tests

On completion of reassembly after repair, measure the insulation resistance and conduct the dielectric strength
test.
Insulation resistance: 7 M Ω or more with DC 500 V Megohm Tester
Dielectric strength: AC 4,000 V/1 minute, with no abnormalities
AC 2,500 V/1 minute, with no abnormalities
m (6 _ + 2 kgf
cm,
• •
--- 17 ---
Fig. 10 Wiring of reversing switch
Fig. 11 Wiring of speed control switch
220 V --- 240 V (and 110 V for U.K. products)
• • • • • • • •
110 V --- 127 V (except for U.K. products)
• • • • • • • •