Siemens 38-3AH3 38 kV instruction manual Maintenance and troubleshooting

Maintenance and troubleshooting

Table 7: Troubleshooting

Problem

Symptoms

Possible causes and remedies

Circuit breaker fails to close.

Closing spring will not automatically charge.		1.	Secondary control circuit is de-energized or
			control circuit fuses are blown. Check and
			energize or replace if necessary.
		2.	Secondary disconnect contacts 15 or 16 are
			not engaging. Check and replace if required.
		3.	Damage to wiring, terminals or connectors.
			Check and repair as necessary.
		4.	Failure of charging motor (88.0). Replace if
			required.
		5.	Motor cut-off switch LS21 or LS22 fails to
			operate. Replace if necessary.
		6.	Mechanical failure of operating mechanism.
			Check and contact regional service centers,
			the factory or telephone Siemens field
			service at +1 (800) 347-6659 or +1 (919)
			365-2200 outside the U.S.
Closing springs	Closing coil or solenoid	1.	Secondary control circuit de-energized or
charge, but circuit	(52SRC) fails to		control circuit fuses blown. Correct as
breaker does not close.	energize. No sound of		indicated.
	circuit breaker closing.	2.	No closing signal to secondary disconnect
			pin 13. Check for continuity and correct
			protective relay logic.
		3.	Secondary disconnect contacts 13 or 15 are
			not engaging. Check and correct as
			required.
		4.	Failure of anti-pump relay (52Y) contacts 21
			to 22, 31 to 32 or 13 to 14. Check and
			replace as required.
		5.	Failure of close coil (solenoid) (52SRC).
			Check and replace as required.
		6.	Auxiliary switch NC contacts 41 to 42 are
			open when circuit breaker contacts are
			open. Check linkage and switch. Replace or
			adjust as necessary.
		7.	Spring-charged switch LS9 NO contacts
			remain open after springs are charged.
			Check and replace as required.
	Closing coil energizes.	1.	Mechanical failure of operating mechanism.
	Sound of circuit		Check and contact regional service centers,
	breaker closing is heard		the factory or telephone Siemens field
	but circuit breaker		service at +1 (800) 347-6659 or +1 (919)
	contacts do not close.		365-2200 outside the U.S.

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