- 10 -
EBARA
Corporation
3-phase
Grounding
Green
E
Black
W
White
V
Red
U
3-phase
Black
Y
White
X
Red
Z
200V
3-phase
Grounding
Green/Yellow
PE
Black 3
W1
Black 2
V1
Black 1
U1
3-phase
Grounding
Green/Yellow
PE
Black 3
U2
Black 2
W2
Black 1
V2
400V
1) Wiring
Wiring should be performed as indicated for the appropriate start system as shown in Fig 4
2)Cable
a) Never immerse the cable end in water.
b) If a cable is extended by connecting other cable, do not immerse the connected section in water.
c) Support the cable by the discharge pipe using an adhesive tape, a PVC band, etc.
d) Lay the cables with care to avoid overheating. Overlap winding or direct exposure to sunray
may cause overheating.
3)Grounding
a) For 3-phase, grounding shall be done using Green and Yellow stripe cord (Label PE) or the Green
cord (Label E) among the four lines, as shown in Fig. 5. Never connect the Green and Yellow stripe
cord or the Green cord to the power source. The grinding shall be surely conducted conforming to
the Technology Standard of Electric Facilities.
b) For the cases of long cable or other situations, the ground fault breaker is actuated in spite of
fully grounding of motor, checked by a megger. The phenomenon occurs from an electrostatic
capacity between the cable and the ground. Specifically, a rush current at start of pump likely
induces the actuation of the ground fault breaker. In that case, the ground fault breaker shall be
the one having low sensitivity of sensitive current. On adopting the ground fault breaker with low
sensitivity of sensitive current, care shall be given to electrical safety by assuring grounding, etc.
4)Motor Protection
(a) Auto-cut (Built-in in 2.2kW motor)
Auto-cut will be activated when motor is operated in abnormal conditions such as locked rotor or
single phase that result in excess over heating.
Fig.4
MOTOR
L1
PE
Gr
ee
n
Red
W
hi
te
Bl
ac
k
PE
L2 L3
U
E
V
W
MOTOR
0
L1
PE
L2 L3
PE
Gr
e
e
n
U
V
W
Z
X
Y
Th
er
m
al
pr
ot
ec
to
r
ca
bl
e
R
e
d
W
hi
te
B
la
ck
R
e
d
W
hi
te
B
la
ck
W
h
it
e
B
la
ck
0
L1
PE
L2 L3
PE
Th
er
m
al
p
ro
tec
to
r
ca
b
le
MOTOR
Gr
e
e
n
R
ed
W
hi
te
B
la
ck
Red
W
h
it
e
Bl
ac
k
W
h
it
e
Bl
ac
k
U
V
W
Z
X
Y
200V Class
200V Class
Fig.5
