Voltage Check; Amperage Check - A.O. Smith ST1302 Manual

26
Level 2

VOLTAGE CHECK

Disconnect power source
Remove canopy
Determine motor voltage and set meter
on proper scale
Reconnect power
Start motor
Touch one probe to L1 and the other to L2.
Voltage reading to be within 10% of nameplate
voltage, i.e. between 207 and 253 volts for a 230
volt motor.
If no voltage is recorded, check pressure switch,
fuses, circuit breakers, timers, wiring, etc. for
open connection or broken wires.
If voltage is outside the acceptable limits-check
for adequate wire size. Look for loose terminals
and connections, or pitted contacts, check pres-
sure switch and pump disconnect switch.
Check voltage at service entrance. If not with-
in + 10% contact power company.

AMPERAGE CHECK

Turn off power at pump disconnect switch.
Set ammeter scale based on max. load amps.
Position one line lead (L1 or L2) so that jaws
of amprobe can encircle one power lead.
Make sure switch and governor are free of
obstructions.
Reconnect power.
Start motor.
Encircle one line lead with jaws of amprobe
and take reading. This value should not
exceed maximum load amps of motor.
Excessive amps means an overloaded condition
or incorrect voltage applied. Problem could also
be in motor.
Pump Motors
A.O.Smith