Lincoln Electric X-TRACTOR 3A Service Manual page 12

X-TRACTOR ® 3A
TERMINAL
STRIP
INPUT
Three phase 460 volts is applied through a terminal strip to a three
phase thermal circuit breaker (F1). 460 volt three phase voltage is
also applied to the motor relay (K1). When this motor relay (K1) is
activated, the 460 volt three phase power is applied to the fan motor
(M1).
In summary, the thermal circuit breaker (F1) must be closed and the
motor relay (K1) must be activated in order for the fan motor (M1)
to be energized. When the fan is energized, the high vacuum, low
volume system is functioning.
Two phases of the three phase input is also applied through a fuse to
the step down control transformer. The 24 volt secondary supplies
power to the control circuitry and to the X-Tractor 3A machine.
Figure E.2 - Input
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-2
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