Eaton Vickers DG3V-8 Series Overhaul Manual page 14

A. Electrical Solenoid Types Available: Two basic types
of electrical solenoids exist:Standard and high performance.
The unit nameplate identifies the type of solenoid being
used. See the model code in Table 2.
B. Electrical Solenoid Voltage Requirement: Electrical
solenoids are available in various AC and DC voltage
ranges. The standard voltage and frequency range is 115V
AC, 60 Hz. Refer to parts and service drawings for units with
non-standard voltage ranges.Ten (-10) design units use an
identification letter for the coil voltage and frequency.
C. Electrical Solenoid Ground Connections and Wiring
Housing: An electrical wiring housing with a
thread connection is available on DG4V-3 pilot valves. Wire
grounding screws are provided for convenience.
D. Manual Override: Each solenoid has a manual
override plunger to shift the pilot spool. This feature allows a
technician to shift the pilot spool when electricity is not
available. Refer to Figure 13. To operate the manual override
feature, obtain a small rod and push in on the plunger.
5. Accessories for Electrical Type Solenoids: The model
code (Table 2) indicates the type of accessories used on
directional valves. Obtain a parts and service drawing for
your particular model (see Table 1). Most accessories
pertain to the pilot section. The most common types of
accessories are discussed in the following paragraphs (A
through F).
A. Hazardous Location Solenoids: This type of is used
at locations where added protection from electrical shortage
failure is mandatory, the solenoid housing is designed to
completely enclose all wiring connections to the valve.
Hazardous location valves are approved Class 1, Group D or
Class 2, Group E-F-G, for 1various voltages.
B. Monitor (Limit) Switch Feature: The monitor switch
feature can be incorporate into a basic spring offset
directional valve. The switch monitors valve spool position
and an be wired into control circuits. This permits electrical
interlocking of various hydraulic controlled motions without
resorting to external mechanical arrangements. The monitor
switch is a single pole, double throw contact arrangement
with -normally closed and - normally open connections.
Switch ratings are noted on installation drawing (Table 1).
The monitor switch housing does not provide a manual
plunger for operation of the switch or valve.
C. Insta-Plug Connectors: Pilot valves can be supplied
with electrical connectors called insta-plugs. These
connectors allow quick disconnect of electrical power from
the valve. The following data pertains to the insta-plug feature:
PA- A prefix of PA in the model code indicates the
male plug section of the insta-plug feature is included
on the valve.
Connect white wires to ''A'' solenoid and black wires to
the ''B'' solenoid. Refer to parts drawing (Table 1) for
additional data.
D. Brad Harrison Connectors: Brad Harrison connectors
thread into the
DG4V-3(S) directional valve.
1
/ " NPTF
2
Female Brad Harrison connectors are not available from
Vickers and must be supplied by the customer.
E. Solenoid Indicator Lights: Solenoid indicator lights are
available for installation on the DG4V-3(S) series directional
valves. Indicator lights are connected across the solenoids
and will light when voltage is present at the solenoid. This
gives an indication to the technician which solenoid is
energized and aids in troubleshooting a system. Refer to the
appropriate parts drawing for additional information.
PB- A prefix of PB in the model code indicates
both the male plug and female receptacle are
included with the valve. the insta-plug feature is
available on the DG4V-3(S) directional valves.
Wiring Note
1
/ " NPTF opening in the wiring housing of a
2
PA3- A prefix of PA3 in the model code indicates
the three pin male connector is included with the
valve.
PA5- A prefix of PA5 in the model code indicates
the five pin male connector is included with the valve.
Body
Flying
Lead Coil
Solenoid
Coil
Manual
Override
Wet Armature (Standard)
Plunger
Core Tube
Figure 13. Typical DG4V-3(S)-C-FW-60
Terminal Box
Pilot Spool
Push Pin
14