Accessories With Installation; Operational Checkup; Troubleshooting - Franklin Electric ST Serie Manual Del Usuario

FAILURE TO GROUND THE UNIT PROPERLY
CAN RESULT IN SERIOUS OR FATAL SHOCK.
REFER TO ELECTRICAL CODE REQUIREMENTS.
Should the unbalance exceed 5%, consult the power
company to improve the voltage balance between the
incoming lines
5. Use a voltmeter to verify the voltage at the starter while
the pump is running. The voltage must be within 10% of
the motor rating, and the maximum variation of any
phase of a three-phase system from the average should
not exceed 1%.
6. Continue to run the pump until the drawdown of the
water in the well becomes stable. Should the water level
drop to the pump intake to admit air, use one or more of
the following methods to protect installation.
(a) Install additional riser pipe to place pump lower in the
well if possible.
(b) Use a gate valve in the discharge line to throttle the
pump output to suit the yield of the well.
(c) Install fl oatless liquid level control.
(d) Use a pressure switch with a low water protection
or a separate low-water cutout switch. Neither of
these devices give as reliable protection as a fl oatless
liquid level control and both require careful application.
(e) Replace the pump with a smaller unit to avoid over-
pumping the well.
NEVER RUN THE PUMP UNLESS IT IS
COMPLETELY SUBMERGED IN WATER.
G. ACCESSORIES WITH INSTALLATION
RELIEF VALVE
Always install a relief valve if the pump is capable of
developing pressures in the discharge system greater
than the pressure ratings of individual components. The
relief valve must be large enough to handle the pump
output at the relief pressure.
H. OPERATIONAL CHECKUP
The most reliable indications of the condition of a
submersible pump are:
(a) Current drawn by the motor.
(b) Insulation resistance of the installation below ground.
As the pump wears, the motor current increases, until
eventually the overloads trip to protect the motor. The
overload is designed to protect the motor in an emergency
situation; proper care of a submersible installation should
include periodic check-ups to avoid interruptions in the
water supply. Use a megger to check the motor's
insulation resistance every six months.
W A R N I N G
C A U T I O N
Record the insulation resistance and the running current
for future reference. When the insulation resistance falls
below 10 megohms, check it frequently for further
deterioration and pull the pump when the resistance falls
to 0.5 megohm or below.
When pulling the pump, either coil the cable on a reel or
raise it from the ground to dry. Check the insulation again
when the cable and splices are dry. If the insulation value
between the line and motor casing increases to 50
megohms or more, isolate the fault in the cable or the
splice and make the necessary repairs. However, if the
insulation reading remains low, disconnect the motor from
the cable and check the motor separately. Should the
motor be defective, check the pump end for wear and
obtain a replacement for either the motor alone, or the
pump unit, as necessary.
I. TROUBLESHOOTING
1. Disconnect power unless required for testing.
2. Have electrical testing done by a qualifi ed electrician.
3. Most problems occur above ground. Remove pump
only as a last resort.
When troubleshooting or servicing the pump, use all
precautions for the voltages involved.
HAZARDOUS VOLTAGE CAN SHOCK, BURN
OR EVEN KILL .
Problem Possible Cause
1. Electrical trouble
Unit fails to
start
2. Pump sandlocked
1. Insuffi cient well yield: water
level has dropped
2. Clogged intake screen
Pump fails to
3. Air lock in pump
deliver water
4. Leak in discharge
1. Screen or pump partly
plugged
2. Insuffi cient well yield
Reduced
3. Worn pump - excessive
pump output
wear due to abrasives
4. Low voltage
5. Three-phase unit running
backward
1. Worn pump or pump bound
Overload
by sand
trips
2. Electrical troubles
1. Pressure switch out of
adjustment
Unit
2. Leaks in service line
cycles too
3. Check valve leaking
frequently
4. Water logged tank
W A R N I N G
Remedy
Check power source: starter
and reset
Check resistance:
cable and motor
Call dealer or electrician
Call dealer: pull pump and
clean
Reset pump - lower into well
Restrict fl ow to yield
Pull pump
Start and stop pump several
times allowing 15 min. between
starts and stops.
Raise pipe until leak is found
Pull pump and clean
Check water level: lower pump
if permissible
Replace worn parts
Call electrician
Reverse rotation
Pull pump and clean or replace
worn parts
Call dealer or electrician
Readjust to correct setting or
replace
Locate and correct
Replace
Check tank for leaks. Be sure
fi ttings are functioning properly
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