2-3.4 Electrical System.
follows:
a.
Contactor K1 Power
TM 5-3610-259-14
Consists of six subcircuits.
Description of each is as
Circuits.
With power applied to the flip-top platemaker,
contactor K1 (main power contactor) will energize, provided the lower cabinet door
is closed, activating proximity switch PX1.
Contacts Cl and C2 of contactor K1
being closed will then apply power to the transient suppressor (TS1) which is used
to suppress voltage spikes.
Power is also made available to the master circuit
breaker (CB1), the vacuum pump circuits, and via contacts of K2, the autoformer
(XT1).
b. Master
(S1) from the
the following
Power Switch Ci
master circuit
components:
rcuits.
Power is applied to the master power switch
breaker (CB1).
Master power switch applies power to
(1) Relay K3, used to route power in the vacuum pump circuits.
(2) Fan Motors (Ml and M2), cooling fans for the 3kW power supply.
(3) Blower Motor (BM), used to cool exposure lamp and cabinet interior.
(4) Pilot Lamp (L1), indicates main power switch is on.
(5) Exposure control circuits.
(6) Filament Transformer (FLT1), used to supply 12 V ac to control circuit
board.
c.
Vacuum Pump Circuits.
Power for the circuits comes from contactor K1 (main
power contactor) contacts.
Power is routed through fuses F1 and F2, contacts Cl and
C2 of relay K3 (vacuum pumps relay), then through the appropriate vacuum pump switch
(S3 or S4), to the vacuum pump.
Relay K3 is energized when the master power switch
(S1) is on.
d.
Exposure Control Circuits.
The exposure control circuits are used to ener-
gize relay K2 (autoformer relay), which energizes the autoformer. Relay K2 can be
energized manually or automatically.
For manual operations, power from the master
power switch (S1) is routed to the manual switch (S2). With the manual switch
closed, power is routed through two overtemperature switches (THS1 and THS2) and the
glass frame proximity switch (PX2) to energize relay K2. Overtemperature switches
are set at 200°F (93.3°C) and are mounted next to the strike transformers in the
power supply circuits.
They open in the event that the temperature around the
strike transformers reaches 200°F (93.3°C).
The glass frame proximity switch is
closed when the vacuum frame is locked in its horizontal position.
For automatic
operation, relay K2 is energized in the same manner as in manual operation.
Instead
of power coming through switch S2 to THS2, power comes from the electronic circuits.
These circuits are comprised of the following components:
(1) Photodetector Assembly (PE1).
Used to detect the intensity of the expo-
sure lamp.
It is wired into the control circuit board.
The more intense the light,
the less resistance applied, which affects exposure time.
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