SECTION 8
ELECTRICAL SYSTEM
Aug 2002
p. 8-2
49836323
5Y9
Cutting Water Supply Shutoff Valve
The cutting water shutoff valve (SOV) is located at the service bulkhead and is
normally- closed (NC), that is, it is closed when no electrical power is applied.
With 24 vdc electrical power applied to 5Y9, the cutting water SOV opens and
remains open. This SOV is useful when a HP plunger seal fails, allowing low
pressure cutting water to flow out of the intensifier weep hole(s) regardless of
whether the pump is running or is turned off. The cutting water SOV prevents
unnecessary water leakage once a manual or automatic pump shutdown
condition is present.
4Y5
Proportional Pressure Solenoid (proportional pressure control option only)
The hydraulic proportional pressure relief valve is located near the main
hydraulic pump. This valve is connected to the pump compensator remote
pressure line (-4 hydraulic size) and is used in place of the 2-pressure (also
called High/ Low pressure) control circuit. Cable 4Y5 is used to vary electrical
power to the proportional pressure solenoid in response to manual inputs from
the operator’s control station. The signal to solenoid 4Y5 is supplied by a
printed circuit board located either in the electrical enclosure (self- contained
starter panel versions) or remotely, at the customer’s operator console (stripped
pump versions).
4Y1
&
4Y2
Directional Control Valve /4-Way Valve Solenoid(s)
The hydraulic directional control valve (DCV), also called the 3-position/ 4-way
valve, is located near the main pump, mounted to a manifold block. A pair of 24
vdc solenoids operated a small (DO3- size) DCV which in turn directs hydraulic
pilot pressure to the main spool of the DO8- sized DCV. Note that both DCV’s
make up a single assembly, with the DO3 valve mounted on top of the DO8
DCV.
During normal operation, 24 vdc power is directed to either one solenoid or the
opposite solenoid, so that the LED’s in the DIN connectors are alternately
illuminated. Visual observation of these LED’s can provide an easy way to
evaluate and troubleshoot intensifier problems, including high pressure water,
hydraulic or electrical control issues.
3S2/3
Hydraulic Oil High Temperature/ Low Oil Level Switches
The combination high temp/ low level switch is located in the hydraulic
reservoir. A float switch and a temperature switch are combined into one unit,
but the 2 switches function independently. When hydraulic fluid level is
sufficiently high to keep the float switch closed, the pump is considered safe to
operate. While oil temperature remains below approximately 145 deg-F, the
pump is considered safe to operate. If hydraulic oil level were to drop below the
float level, or if oil temperature were to exceed the temperature switch setting,
damage could result to costly hydraulic components.
Summary of Contents for STREAMLINE SL-IV PLUS
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