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Technical Data
Technical Data
MOTOR INSULATION RESISTANCE READINGS
Normal Ohm/Megohm readings, ALL motors, between all leads and ground
To perform insulation resistance test, open breaker and disconnect all leads from QD control box or
CAUTION
pressure switch. Connect one ohmmeter lead to any motor lead and one to metal drop pipe or
a good ground. R x 100K Scale
Condition of Motor and Leads
New motor, without power cable
Used motor, which can be reinstalled in well
New motor
Motor in reasonably good condition
Motor which may be damaged or have damaged power cable
Do not pull motor for these reasons
Motor definitely damaged or with damaged power cable
Pull motor and repair
Failed motor or power cable
Pull motor and repair
Generator Sizing
Generator Sizing
Note: Always consult the generator
manufacturer when questions arise.
These sizing charts are recommendations based on motor
service factor loading for typical continuous duty generators. If
you need to call the generator manufacturer, be prepared to tell
them the motor KVA code, the service factor amperage, locked
rotor amperage, phase, hertz, motor type, etc.
You must know which type generator you have before using the
charts as the required generator size varies by type. Internally
regulated generators are also called self-excited. Externally
regulated generators are the most common. In addition to the
Kw/KVA rating, the generator frequency (Hertz, typically
Generator Recommendations
Generator Recommendations
Motor
3-Wire
1Ø
and
3Ø
Motors
10
Motor in well – Readings are power cable plus motor
Externally Regulated
HP
KW
.5
2
.75
3
1
4
1.5
5
2
7.5
3
10
5
15
7.5
20
10
30
15
40
20
60
25
75
30
100
40
100
50
150
60
175
75
250
100
300
125
375
150
450
175
525
200
600
OHM Value
20,000,000 (or more)
10,000,000 (or more)
2,000,000 (or more)
500,000 to 2,000,000
20,000 to 500,000
10,000 to 20,000
Less than 10,000
60 HZ in USA) is very important when operating pumping
equipment because frequency variations affect pump output in
direct relation to the pump Affinity Laws. Operating under 60
hertz will reduce flow and head while operating over 60 hertz
will increase flow, head, HP and amp draw and could overload
the motor.
The generator should always be started before the pump/
motor is started and always stop the pump/motor before
shutting down the generator. Operating generators at higher
elevations or using natural gas as fuel can affect performance,
consult the generator manufacturer for their recommendations
in these instances.
KVA
Minimum Generator Rating
2.5
3.8
5
6.3
9.4
12.5
18.8
25
37.5
50
75
94
125
125
188
220
313
375
469
563
656
750
Megohm Value
20.0
10.0
2.0
0.5 – 2.0
0.02 – 0.5
0.01 – 0.02
0 – 0.01
Internally Regulated
KW
KVA
1.5
1.9
2
2.5
2.5
3.2
3
3.8
4
5
5
6.3
7.5
9.4
10
12.5
15
18.8
20
25
25
31
30
37.5
40
50
50
62.5
60
75
75
94
100
125
150
188
175
219
200
250
250
313
275
344
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