Section 8
Electrical System
20412989
1-2012/Rev 08
8-7
Table 8-1
Sensors and Solenoids
Component Function
Hydraulic Reservoir
5 The temperature/low level switch monitors the oil
temperature and level in the reservoir. Although the
float switch and the temperature switch are combined
in a single unit, the two switches function
independently.
If the operating oil temperature exceeds 144 F (62
C) an automatic shutdown occurs. If the hydraulic
fluid level falls below specifications, a low oil level
shutdown occurs.
6 Models equipped with an air cooler utilize a
temperature switch to regulate oil temperature.
Hydraulic Manifold
7 The 4-way directional control valve shifts the
hydraulics back and forth to the intensifier. A shift
valve directs pressurized oil to one end of the
hydraulic cylinder and returns fluid to the reservoir
from the opposite end, causing the intensifier to
stroke. The movement is controlled hydraulically by
a pilot valve that is electronically operated by two
solenoids, energized by the PLC. As power is
directed from one solenoid to the other, LEDs are
alternately illuminated.
8 When low pressure is selected, a normally closed,
solenoid valve is activated. The valve remains
closed while operating in high pressure and is held
open electrically during low pressure operation. An
illuminated LED on the solenoid indicates low
pressure operation.
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