FRANKLIN
MANUFACTURING CORPORATION
Reprinted by AFM Engineering, Inc. -6- Phone 714.547.0194
1313 E. Borchard Ave.
Fax 714.542.2728
Santa Ana, CA 92705 Email [email protected]
This control switch will also activate the solid state heat control. The
solid state heat control unit can be located inside the control box easily,
since it is the only unit composed of a printed circuit board with a small
relay in the corner.
Power for this unit is supplied to Terminals L1 and L2 on the top surface
of the board. A jumper is used between L1 to terminal C for the common.
The potentiometer located on the front panel of the control box is used as
a remote control for pre-setting the desired temperature. Wires from this
potentiometer are connected to P1, P2, and P3 on the circuit board.
(Green and White to P1------- Red and White to P2------- Black and
White to P3.)
A thermistor probe, which is located in the aluminum or heated portion
of the head, provides a signal to this unit to energize the normally open
contact when the heated head temperature becomes lower than the pre-set
temperature.
The two leads from the thermistor are connected to T1 and T2.
When the thermistor calls for heat, the circuit board generates a 24 volt
current to the small relay located in the corner of the control board. A
110 volt is generated across the contact points of the small relay to close
the 220 volt contactor, thus supplying current to the cartridge heaters.
A yellow pilot light, located on the panel directly above the heat
adjustment, will light and stay lit as long as the thermistor is calling for
heat.
The third major circuit is the dwell time control. This circuit provides the
necessary electric signals to operate the pneumatic units of the press.
