Xylem GSSERVICE R2 Service Manual Submersible Pumps & Jet Pumps - Manual (Page 38)

36
1. Set the scale lever to R x 1 for values under 10 ohms.
For values over 10 ohms, set the scale lever to R x 10.
Zero balance the ohmmeter as described earlier.
WARNING!
Open master breaker and disconnect all
leads from starter to avoid damage to meter
or electric shock hazard. Connect the ohm-
meter leads as shown below.
2. Connect the ohmmeter leads as shown below.
Cable Resistance – Copper
!
Z E R O
O H M S
R X 1 0 0
R X 1 0
R X 1
R X 1 0 0 0
R X 1 0 K
R X 1 0 0 K
O H M S
Z E R O
O H M S
R X 1 0 0
R X 1 0
R X 1
R X 1 0 0 0
R X 1 0 K
R X 1 0 0 K
O H M S
RX1
or
RX10
Motor
Leads
Ground
Wire
Drop
Cable
With
Ground
Wire
RX100K
If aluminum cable is used the
readings will be higher. Divide
the ohm readings on this chart
by 0.61 to determine the actual
resistance of aluminum cable.
Size
Paired Wire
Cable Resistance
(ohms per foot)
14 .0050
12 .0032
10 .0020
8 .0013
6 .0008
4 .0005
2 .0003
0 .0002
00 .00015
000 .00013
0000 .00010
See motor data pages for motor resistance ratings.
What it Means
1. If all ohm values are normal, the motor windings are
neither shorted nor open, and the cable colors are
correct.
2. If any one ohm value is less than normal, the motor is
shorted.
3. If any one ohm value is greater than normal, the winding
or the cable is open or there is a poor cable joint or
connection.
4. If some ohm values are greater than normal and some
less, the leads are mixed.
MO
TOR
WINDING RESIS
TANCE CHECK
OUT