Franklin Water Pump H. Accessories With Installation, Starter, Example, Lightning Arresters

Check that the currents in the individual phases of a 3-phase system are approximately equal. Where there is considerable difference between them, change all 3 connections at the starter as shown below (so that rotation remains the same) to obtain the most consistent readings.

Starter	L1	L2	L3
cable (1)	black	yellow	red
cable (2)	red	black	yellow
cable (3)	yellow	red	black

Then subtract the average of the readings from the highest. The difference, expressed as a percent of the average must not exceed 10%. Note that the highest reading must not exceed the maximum permissible for the motor.

EXAMPLE:

Phase 1	54.0 amp
Phase 2	55.0 amp
Phase 3	60.0 amp
Average:	56.3 amp

%Unbalance = 60 - 56.3 x 100 56.3

=3.7 x 100 = 6.6%

56.3

WARNING

FAILURE TO GROUND THE UNIT PROPERLY CAN RESULT IN SERIOUS OR FATAL SHOCK. REFER TO ELECTRICAL CODE REQUIREMENTS.

Should the unbalance exceed 10%, ask the power company to improve the voltage balance between the incoming lines.

5- Use a voltmeter to check the voltage at the starter while the pump is running. The average must be within 10% of the motor rating, and the maximum variation of any phase of a 3-phase system for 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 cock or similar valve in the discharge line to throttle the pump output to suit the yield of the well.

(c)Install FLOATLESS 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 floatless liquid level control and both require careful application.

(e)Replace the pump with smaller unit to avoid over pumping the well.

*CAUTION*

NEVER RUN THE PUMP UNLESS IT IS COMPLETELY SUBMERGED IN WATER.

Damage can occur to both pump and motor, in addition, air drawn into the pump can cause air-lock.

H. ACCESSORIES WITH INSTALLATION

LIGHTNING ARRESTERS

Install lightning arresters to protect the motor from the effects of electrical storms. Although they will not give protection against direct stirkes they will ground the surges caused in transmission lines by surrounding storms.

One arrester is sufficient for a single-phase unit, but two are necessary for a three-phase unit. Install them in accordance with the manufacturers separate instructions, either in the control box on some single-phase systems, or in the supply line immediately ahead of the control equipment. Pay particular attention to the ground connection. DO NOT USE GROUND ROD. Use the best ground on the premises, which is usually the metal riser pipe from the pump or other metal water pipe.

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.

6