Lincoln Series 1200 用户手册

Impinger I -–1000 Series Service Manual - International

TIME/TEMP

DISPLAY(S/N Q14790 &

Below, 1200 series S/N

Q14973 & Below, 1000

series)

(S/N Q14791 & Above,

1200 series S/N Q14974

& Above,

1000 series refer to Pg.

The Time/Temp. Display is energized when the Fan Switch is closed, supplying 120

VAC to the primary of the12.6 volt Transformer. The secondary output of the

transformer, normally 13 to 14 VAC (depending on input), with a center tap, is

supplied to terminals 1,2, and 3 of the Time/Temp. Display. The center tap is

terminal 2. The display works on a balanced input and center tap voltage to each leg

must be 1/2 the total reading.

The speed side of the Time/Temp. Display uses a slotted disc (cemented to tach.

coupling) to break the infra-red light beam of the optical switch (mounted on gear

motor) producing electrical pulses that are transmitted to the display. The display

converts these pulses into a read-out of minutes and seconds. The temperature

portion of the display uses a Thermistor Probe to sense oven temperature. The

thermistor outputs a resistance proportional to the oven temperature. This resistance

is then converted by the display into a temperature reading.