Insulation Tests; No-Load Current Values - Hitachi DH 22PB Technical Data And Service Manual

B. Additional wiring work
General internal wiring can be accomplished by referring
to paragraphs 9-4 and 9-5-A. The following are special
instructions for switch connection.
(1) Wiring of reversing switch
Insert the lead wire (black) coming from the stator into
the terminal (1) of the reversing switch, and the lead
wire (white) into the terminal (2) as shown in Fig. 21.
Insert the lead wire (brown) coming from the carbon
brush or choke coil into the terminal (3) and the lead
wire (blue) into the terminal (4). After the 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 windows near the
terminals and pull out the lead wires.
(2) Wiring of speed control switch
Insert each cord into the terminal 1 and terminal 2
of the speed control switch as shown in Fig. 22 and
tighten the screw (tightening torque: 0.6
(6 2 kgf cm, 5.2
•
(gray) coming from the stator into the terminal M1 and
the lead wire (red) into the terminal M2. Insert each
lead wire (white) coming from the noise suppressor
into the terminal C1 and C2. After the 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 windows near the
terminals and pull out the lead wires.

9-6. Insulation Tests

On completion of disassembly and 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 220 V --- 240 V (and 110 V for U.K. products)
AC 2,500 V/1 minute, with no abnormalities 110 V --- 120 V (except U.K. products)

9-7. No-load Current Values

After no-load operation for 30 minutes, the no-load current value should be as follows:
Voltage (V)
Current (A) max.
0.2 N
1.7 in-lbs.)). Insert the lead wire
110 120
3.6 3.3
Fig. 18 Wiring of reversing switch
m
•
Fig. 19 Wiring of reversing switch
220 230
1.8 1.7
--- 27 ---
(Stator) (CB or choke coil)
(CB or choke coil)
(Noise suppressor) (Noise suppressor)
(Stator)
(Cord)
(Cord)
240
1.6
(Stator)
(Stator)