Lincoln Electric X-TRACTOR 3A Service Manual page 14

X-TRACTOR ® 3A
TERMINAL
STRIP
CLEANING CIRCUITRY
24 VAC is applied to timer (T1) and the cleaning switch. When motor
relay (K1) is energized, a 24 VAC activation signal is applied to timer
(T1) via a set N.O. auxiliary contacts located on motor relay (K1).
When the cleaning switch is closed, 24 VAC is applied to a digital
timer module via a set of N.O. contacts on timer (T1). The digital
module timer controls the cleaning solenoid valve. When the cleaning
solenoid valve is opened, a pulse of compressed air shakes the
particulate from the outside surface of the air filter.
Figure E.4 - Cleaning circuitry
3 PHASE 3 PHASE
F1
T1
TIMER
K1
AUXILIARY
ACTIVATION
CONTACTS
SIGNAL
N.O.
24VAC
460V
CONTROL
TRANSFORMER
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
E-4
K1 MOTOR
RELAY
M1
FAN
MOTOR
3Φ
CLEANING
SWITCH
T1 TIMER
CONTACTS
N.O.
T2 CONTACTS
S2
24VAC
ON/OFF
SWITCH
T2
TIMER
ACTIVATION
SIGNAL
THEORY OF OPERATION
CLEANING
DIGITAL
SOLENOID
TIMER
VALVE
N.O.
F1 AUXILIARY
CONTACTS
AUTO/MANUAL
SWITCH
PINS
1 + 2
REMOTE
RECEPTACLE