Mitsubishi Electric HR Series, Instruction Manual

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(2) Grounding (earthing)
The insulation material of the motor is an insulator and also is a conductor. Thus, the motor has a
capacitance between the ground. If the motor is not grounded, an induction voltage that is approx.
50 to 60% of the power voltage may be generated in proportion to this capacitance between the
frame and ground. To prevent accidents caused by electric shocks, always ground the motor
according to the Guide book of Electrical Facility Technology Standards Clause 18 to 28. A
grounding screw is provided in the motor's terminal box or on the lower part of the frame. If the
grounding screw loosens due to vibration during operation, sparks may be ignited at the grounding
section. Wire the grounding wire so that the grounding screw will not loosen because of the
grounding wire vibrating, and lock the grounding screw.
(3) Switch and fuse
Select the switch fuse according to the local power company's standards. Refer to Table 5 for the
capacity and wire size of the switch, fuse and instruments. Use of the Mitsubishi MS magnetic
switch for starting the motor and as overload protection is recommended.
(4) Structure of motor terminal lead sections and connection to power supply
a) Follow Table 7 when connecting the power supply to the lead wires or terminal block terminals.
Also refer to the connection nameplate in the terminal box and to the catalogs, etc.
b) Do not bend, pull or catch the power cable or motor lead wires with force.
c) Tighten the terminals firmly so that they will not be loosened by vibration during operation.
d) Do not disconnect or replace the wires in the motor.
Table 7 Structure of standard motor terminal lead sections and connection to power supply
Frame
No.
63
71
Terminal lead structure
No. of outlet
wire terminals
Connection method
Output (kW)
2P, 4P
0.2
0.4
80
to
112
0.75
to
3.7
-
6P
0.2
0.4
to
2.2
132 3.7
160
to
180
11
to
30
7.5
to
18.5
(SF-type
22kW)
180
to
225
37
to
90
132
5.5
7.5
5.5
(SB-type
22kW)
30
to
75
W
V
U
Terminal block type
Wiring in
motor
Direct-online start
Power supply
R S T
U V W
V
U W
3 terminals
Power supply
R S T
Direct-online start
V2 W2 U2
W1 V1 U1
Starter
V2 W2 U2
U1
V2
V1
W2
W1
U2
U1 V1 W1
Starter
Disconnect
the jumper
Jumper
- start
Y
Direct-online start
Power supply
R S T
U1 V1 W1
V2 W2 U2
Starter
Starter
U1 V1 W1
U1 V1 W1
V2 W2 U2
U2 W2 V2
V1
U1
W1
6 terminals
W2
U2
V2
Direct-online start
Case 400V Case 200V
Power supply
R S T
U1 V1 W1
U5 V5 W5
V2 W2 U2
V6 W6 U6
Power supply
R S T
U1 V1 W1
U5 V5 W5
V2 W2 U2
V6 W6 U6
Case 400V
Starter
U1 V1 W1
U1 V1 W1
U5 V5 W5
V2 W2 U2
V6 W6 U6
U1 V1 W1
U1 V1 W1
U5 V5 W5
V2 W2 U2
V6 W6 U6
Starter
V6 W6 U6
Case 200V
Starter
Starter
V6 W6 U6
V1
U1
W1
W5
12 terminals
W2
W6
U2 U5 U6
V2
V5
V6
V2 W2 U2
W1 V1
U1
Terminal block type
Wiring in
motor
U V W
Terminal block type
Lug type
Lead-out wire arrangement
Lug type
U1 V1 W1
U5 V5 W5
V2 W2 U2
V6 W6 U6
Terminal symbol is indicated on
end of lead : for M6 screw
Power connection terminal
M4 screw tightening torque 140 to 165N•cm
Power connection terminal
M4 screw tightening torque 140 to 165N•cm
Power connection terminal
M4 screw tightening torque 140 to 165N•cm
- start
Y
- start
Y
Wiring of lead wire
M6 terminal screw for standard
round crimp terminal
U1
V1
V2 U2
W2
W1