10
Phase & Motor Rotation Tester Model 6609
4.2 Indication of Direction of the Rotating Field,
or Direction of Rotation without Connecting
Test Leads
1. Do not connect any test leads to the instrument.
2. Position the instrument on the motor, within 2.5 cm, parallel to
the shaft in the direction indicated by the symbol on the front
panel.
3. Press the ON (TEST) button. The Green LED indicator indi-
cates that the instrument is in operation.
4. The clockwise or counter-clockwise rotation indicator lights to
indicate the direction of the rotating field.
Note:
The instrument does not work on motors controlled by
frequency converters.
R
The table below summarizes the conditions necessary to obtaining
a reliable test result.
Number of
pairs of poles
Number of rotations of the
rotating field (per minute) as a
function of frequency (Hz)
Angle
between
poles
Minimum
Ø
of the
motor casing
16 2/3
50
60
0
cm
1
1000
3000
3600
60
5.3
2
500
1500
1800
30
10.7
3
333
1000
1200
20
16.0
4
250
750
900
15
21.4
5
200
600
720
12
26.7
6
167
500
600
10
32.1
8
125
375
450
7.5
42.8
10
100
300
360
6
53.5
12
83
250
300
5
64.2
16
62
188
225
3.75
85.6
