Lincoln Electric V300-PRO Test Procedures, Next Test Step Check Result Conclusion Repair Action

TEST PROCEDURES

					Next
			Test		Test
Step	Test	Check	Result	Conclusion	Step	Repair Action
1A	Output pilot circuit	223A to 210	24 VAC	Fan thermostat, choke	1B
	(set S4 on)			thermostat, T1 trans-
				former and S4 all OK.
			0 VAC	Check above compo-
				nents.
1B		302 (pos) to 275D (neg)	15 VDC	T1 and 15V power sup-	2
				ply OK.
			0 VDC	Check T1 and Power PC
				Board.
2	Protection PC	313 (neg) to 311 (pos)	<1 VDC	Protection PC Board OK		Replace Power
	board output (set					and Control PC
	S4 on)					Boards
			>5 VDC		3A
3A	Static capacitor	Compare voltage across	<25 VDC	C1, C2, R1, R9 - OK
	balance (set S4	terminals 9 & 12 of each	difference	(575 VAC machine C14,
	off)	Switch PC Board.	between	C15 - OK)
		575 VAC -- 407 VDC	readings
	380 VAC input	460 VAC -- 325 VDC				Replace
	and higher test	440 VAC -- 311 VDC				Protection PC
		415 VAC -- 293 VDC			3B	Board
		380 VAC -- 269 VDC
		575 VAC only - compare	>25 VDC	Check above compo-
		voltage across 9A & 13	difference	nents.
		and 13 & 12A; then, 9B &
		15 and 15 & 12B
3B	Dynamic capaci-	Connect as in step 3A.	<25 VDC	OK
	tor balance (set	Same voltages as above.
	S4 on)
	380 VAC input		>25 VDC	Power PC Board or	4
	and higher test			Switch PC Boards are	and
				damaged.	5

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact your local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

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