(380/440v
3 phase ac motors)
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information source : Crompton Parkinson
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Note 1 : overload scales suitable for direct on line
start motors, standard scales normally preferred for
star-delta and resistance start motors.
|
Note 2 : wattmeters used with d.o.l. and frequent
duty assisted start motors should have their current
elements shorted during initial start up.
|
Note 3 : ammeter burdens 1.5VA max. ( normally
industrial or "class D" C.T.'s)
wattmeter burdens 2VA max.("class C"
C.T.'s recommended)
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MOTOR
RATING
|
AMMETER
SCALE (Amps. note 1)
|
WATTMETER
SCALE (Kilowatts. note 2)
|
C.T.
PRIMARY (note 3)
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kW
|
HP
|
0.37
|
1/2
|
0
/ 1.5 / 9
|
0
/ 1
|
direct
connected
|
0.55
|
3/4
|
0
/ 2 / 12
|
0
/ 1
|
direct
connected
|
0.75
|
1
|
0
/ 3 / 18
|
0
/ 1.5
|
direct
connected
|
1.1
|
1.1/2
|
0
/ 5 / 30
|
0
/ 2
|
direct
connected
|
1.5
|
2
|
0
/ 5 / 30
|
0
/ 2
|
direct
connected
|
2.2
|
3
|
0
/ 6 / 36
|
0
/ 3
|
direct
connected
|
3
|
4
|
0
/ 8 / 48
|
0
/ 4
|
direct
connected
|
4
|
5.1/2
|
0
/ 10 / 60
|
0
/ 6
|
direct
connected
|
5.5
|
7.1/2
|
0
/ 15 / 90
|
0
/ 8
|
direct
connected
|
7.5
|
10
|
0
/ 20 / 120
|
0
/ 10
|
direct
connected
|
11
|
15
|
0
/ 30 / 180
|
0
/ 15
|
30A
|
15
|
20
|
0
/ 40 / 240
|
0
/ 20
|
40A
|
18.5
|
25
|
0
/ 50 / 300
|
0
/ 30
|
50A
|
22
|
30
|
0
/ 60 / 360
|
0
/ 30
|
60A
|
30
|
40
|
0
/ 80 / 480
|
0
/ 40
|
80A
|
37
|
50
|
0
/ 80 / 480
|
0
/ 50
|
80A
|
45
|
60
|
0
/ 100 / 600
|
0
/ 60
|
100A
|
56
|
75
|
0
/ 150 / 900
|
0
/ 80
|
150A
|
75
|
100
|
0
/ 200 / 1200
|
0
/ 150
|
200A
|
90
|
125
|
0
/ 200 / 1200
|
0
/ 150
|
200A
|
110
|
150
|
0
/ 300 / 1800
|
0
/ 200
|
300A
|
132
|
175
|
0
/ 300 / 1800
|
0
/ 200
|
300A
|
150
|
200
|
0
/ 300 / 1800
|
0
/ 200
|
300A
|
|
