Multiquip manual ST-3050D Submersible Pump -TROUBLESHOOTING, Table X. Pump Troubleshooting

ST-3050D SUBMERSIBLE PUMP —TROUBLESHOOTING

TABLE X. PUMP TROUBLESHOOTING

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
		Check that proper voltage (230/460 3Ø) is being supplied to the
	Incorrect voltage/amps?	pump. Also check that there is an adequate amount of current
		(amps) to run the pump. Check power source circuit breaker.
	Check electrical connections?	If using float switches check wiring, inspect power cord.
	Blown power fuse?	Replace fuse, check cause of blown fuse.
Pump Fails To Start
	Impeller locked?	Disconnect power cord and check for clogging and improper impeller
		clearance. Unclog pump. Check overload protection device.
		Use multimeter to check motor insulation. Insulation resistance must
	Wet motor windings?	be approximately 15 megaohms. If resistance is low, disassemble
		pump motor and bake windings to dry them.
	Defective motor and pump	Check for excessive bearing wear, if worn replace bearings. Replace
	bearings?	motor if defective.
	Twisted or restricted discharge	Lay hose flat un-kinked. Remove clog from hose line.
	hose?
	Clogged pump strainer?	Clean strainer.
Pump Fails to Deliver Full
		Use a voltmeter to check voltage while pump is energized. Voltage
Output
	Low voltage?	must be within ±10%. Check power source (no load and load). If an
		extension cord is used, make sure it has adequate current-carrying
		capacity for the required length.
	Impeller worn?	Replace impeller.
Water in Seal Oil	Defective water seal?	Replace water seal.
	Loose Oil Fill Plug?	Tighten securely.

Performance Curve

	(Feet)	90
	Head
						TOTAL HEAD
	Total					Max 86 ft
						CAPACITY
Figure 20.		60				Max 264 G.P.M
Performance Chart
		30
		0	100	200	300	Capacity(US.G.P.M)
	ST-3050D — PARTS & OPERATION MANUAL — REV. 0 (11/18/02) — PAGE 27