Insulation Tests - Hitachi DH 28PC Technical Data And Service Manual

(2) Wiring of the speed control switch
Insert a Black or Brown cord to terminal (1 )
marked on the variable trigger switch and a White
or Blue cord to terminal (2
figure, then tighten their screws (with tightening
torque of 0.6 ±0.2 N•m (6 ±2 kgf•cm). Insert the
lead wire (Gray) from Stator [73] to terminal (M1),
the other lead wire (Red) from Stator [73] to
terminal (M2), and the lead wires from Noise
Suppressor [51] to the terminals (C1 and C2).
Gently pull on each inserted cord or lead wire to
confirm that it does not come out.
For wire disconnection, insert the tip of a small
slotted screwdriver or needle into a hole on the
side of each terminal, and then pull out the wire.

6. Insulation tests

Upon completing completion of disassembly and repair, measure the insulation resistance and conduct a
dielectric strength test as follows:
Insulation resistance : 7 M or more using a DC 500 V megohm tester
Dielectric strength : AC 4,000 VAC for one minute, with no abnormalities---220 to 240 V
: AC 2,500 VAC for one minute, with no abnormalities---110 to 120 V
7. No-load current value
After no-load operation for 30 minutes, the no-load current values should be as follows:
Voltage (V)
Current (A) max.
) as shown in the
110 120
3.6 3.5
-28-
Cord [55] :
Black or Brown
M2
Stator [73]: Red
Stator [73]: Gray
Noise Suppressor [51]
(and 110 V for UK products)
(except UK products)
220 230
2.1 2.1
Cord [55] :
White or Blue
1 2
M1
C2
240
2.0