Lincoln 1628-000-A - Manual (Page 4)

Low Profile – 1600 Series Adv Dig Electric S.M. – Int’l
4
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
Incoming power supply Check breakers/ reset if required call Power company
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
box
Terminals are normally closed, if open, reset
thermostat and test oven for proper operation. If it will
not reset, replace thermostat.
Capacitor(s) Check for opens, shorts, or grounds.
Oven fan will not
run
Motor(s), main fan Check for opens, shorts, or grounds.
No main fan cool
down
20 minute time delay relay Check for supply voltage at terminals #1 and #2 while
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.
Fan switch (SEE OVEN FAN WILL NOT RUN.)
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.
No control box
cooling
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
control box cooling
Incoming power supply Check circuit breakers, reset if needed. Call power
company if needed.