Miller Electric TM-353E manual Control Board PC1 Test Point Values

6-5. Control Board PC1 Test Point Values

			a) Tolerance – ± 10% unless
		PC1 Voltage Readings	specified
			b) Reference – to circuit common
			(lead 42) unless noted
Receptacle	Pin	Value
RC51	1	18 volts ac input
	2	18 volts ac input
	3	+10 volts dc output
	4	Circuit common
	5	Not used
	6	Not used
RC52	1	Circuit common
	2	+1 millivolt dc per 3 ampere of weld output
RC53	1	Gate pulse for SCR1 with respect to pin 2 (see Section 6-3)
	2	Reference for gate pulse to SCR1
	3	Gate pulse for SCR3 with respect to pin 4 (see Section 6-3)
	4	Reference for gate pulse to SCR3
	5	Gate pulse for SCR2 with respect to pin 6 (see Section 6-3)
	6	Reference for gate pulse to SCR2
	7	Gate pulse for SCR4 with respect to pin 8 (see Section 6-3)
	8	Reference for gate pulse to SCR4
RC54	1	Not used
	2	0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with Amperage Control
		switch S5 in Panel position, and contactor on
	3	0 volts with Output (Contactor) switch S3 in On position or +7.8 volts dc with S3 in Remote position
	4	0 to +10 volts dc input from min. to max. of Crater Control R11 with Crater Fill switch S7 in On posi-
		tion, or +10 volts dc with S7 in Off position
	5	+10 volts dc output with Output (Contactor) switch S3 in On position
	6	–24 volts dc
	7	–24 volts dc with contactor on or off
	8	0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with contactor on
	9	0 to +10 volts dc input from min. to max. of Amperage Adjustment control R1 with contactor on
	10	Circuit common
	11	+24 volts dc
	12	0 volts during open-circuit voltage condition; +24 volts with arc on or contactor off

Syncrowave 250 TM-353 Page 31