Siemens manual 13

Operation

Trouble Shooting	DANGER
	Hazardous voltage.
	Will cause death, serious injury,
	electrocution or property damage.
	Disconnect all power before working on
	this equipment.

TROUBLE	POSSIBLE CAUSES	CORRECTION
Motor overheating	Open stator windings.	Disconnect motor from load. Check idle amps
(continued…)		for balance in all three phases. Check stator
		resistance in all three phases for balance.
	Air Recirculation.	Check air intake and exhaust for obstructions.
		Check air inlet temperature.
	Over voltage/under voltage.	Check voltage and compare to rating plate.
	Ground.	Locate with test lamp or insulation tester and
		repair.
	Improper electrical connections.	Recheck electrical connections.
	Heat exchanger tubes blocked.	Clean tubes, if so equipped.
	Loose heat exchanger tubes.	If so equipped, Roll tubes to expand tube
		inside diameter using proper expansion tool.
Fine dust under coupling	Misalignment.	Realign motor and driven equipment.
having rubber buffers or		Inspect coupling.
pins.
Bearing overheating.	Oil level too high or low (sleeve bearing).	Correct oil level. See Maintenance section of
		this instruction book to determine proper oil
		level.
	Misalignment.	Realign motor and driven equipment.
	Excessive tension in belt drive.	Reduce tension to point of adequacy.
	Excessive end thrust.	Reduce thrust. Recheck mounting and
		alignment.
	Too much grease (ball or roller bearing).	Relieve supply to point set by manufacturer.
	Sticking oil ring (sleeve bearing).	Clean, repair, or replace. Recheck mounting.
Oil leakage or excessive	Parts not sealed properly.	Seal pipe plugs and connections.
oil usage.		Seal bearing housing split line.
		Seal oil seal joint.
	Clogged oil return holes in oil seals.	Dismantle and clean oil seals.
Excessive oil level	High pressure or vacuum in bearing cavity.	Measure pressure or vacuum using
fluctuation.		manometer (See “Cavity Pressures” under
		Bearings).
		Check atmospheric vents for obstructions.
		Check oil seal gap for uniformity.

- 12 -