Lincoln 1629-000-A, 1621-000-EA, 1628-000-A service manual Troubleshooting Guide

TROUBLESHOOTING GUIDE

		MODEL 1621-000 EA	230/400 VAC		50 HZ	3 PHASE
		MODEL 1628-000 A	220/380 VAC		50 HZ	3 PHASE
		MODEL 1629-000 A	240/415 VAC		50 HZ	3 PHASE
	NOTE: When checking components on left side of unit, be sure to check for proper connections in power
	connector, (marked P. C. on schematic diagram) located inside motor cover.
	SYMPTOM	POSSIBLE CAUSE		EVALUATION
	Oven fan will not	Incoming power supply		Check breakers/ reset if required call Power company
	run			if needed.
		Fuse, 10 A., main fan		Check, replace if necessary.
		Fuse holder		Check, replace if necessary.
		Filter, Power		Check for supply voltage to filter. If there is no voltage,
				trace wiring back to fuse holder. If there is power in to
				the filter, but no power out, replace the filter.
		Oven fan switch		Check continuity between switch terminals.
		20 minute time delay relay		Check for supply voltage to terminal #1 and #3, if
				there is no voltage, trace wiring back to the power
				filter. If voltage is present, check for supply voltage at
				terminals #3 to #6, if no voltage is present, trace
				wiring back to on/off switch. If there is voltage at #3
				and #6, check for voltage at terminals #1 and #2, of
				there is no voltage at Terminals #1 and #2, replace
				the 20 minute time delay relay.
		Relay, main fan motors		Check for power to coil of motor relay. If no voltage is
				present, trace wiring back to 20 minute time delay
				relay. Check for supply voltage to the contact of the
				relay. If no voltage is present, trace wiring back to
				power filter. If voltage is present, at the relay coil,
				check to insure the contacts are closing. Replace
				relay as needed.
		Hi-limit thermostat(s), control		Terminals are normally closed, if open, reset
		box		thermostat and test oven for proper operation. If it will
				not reset, replace thermostat.
		Capacitor(s)		Check for opens, shorts, or grounds.
		Motor(s), main fan		Check for opens, shorts, or grounds.
	No main fan cool	20 minute time delay relay		Check for supply voltage at terminals #1 and #2 while
	down			is “ON”. Turn “OFF” the main fan switch, supply
				voltage should continue to be present for 20 minutes.
				If voltage is not present for 20 minutes, replace 20
				minute time delay relay.
	No control box	Fan switch		(SEE OVEN FAN WILL NOT RUN.)
	cooling	Hi-limit thermostat(s)		Terminals are normally closed, if open, reset
				thermostat and test oven for proper operation. If it will
				not reset, replace thermostat.
		Relay, main fan motors		Check for power to coil of oven fan relay. If no voltage
				is present, trace wiring back to hi-limit thermostat.
				Check for supply voltage to the contact of the relay. If
				no voltage is present, trace wiring back to fuse holder.
				If voltage is present, at the relay coil, check to insure
				the contacts are closing. Replace relay as needed.
		Cooling fan(s)		Supply voltage should now be at these motors. If
				voltage is present, check motor for open, shorts, or
				grounds. WITH POWER OFF: check for locked rotor.
	No automatic	Incoming power supply		Check circuit breakers, reset if needed. Call power
	control box cooling			company if needed.
4				Low Profile – 1600 Series Adv Dig Electric S.M. – Int’l