Electrical Connection - Moog D941 Serie Manuel De L'utilisateur

3 Installation
Compare model number and type with that specified on hy-
draulic schematic. The valve can be mounted in any position,
fixed or movable. The venting screw has to point upwards.
Mounting surface:
(< 0.01 mm (0.00004 in) over 100 mm (3.94 in)) and finish
(R < 0.8 µm). Care must be taken to ensure that contamina-
a
tion does not enter the hydraulic system, all work areas must
be clean of surface or air-borne contamination.
Mounting: Socket head screws (grade 10.9) according to
EN ISO 4762, torque diagonally alternating.
Pattern to
Series ISO 4401
D941 05-05-0-05
D942 07-07-0-05
D943/4 08-08-0-05
4 Pilot Mode and Maximum Pressures
Pilot mode: Pay attention to the hydraulic connection scheme
and to the mounting pattern of the hydraulic manifold. Pay at-
tention to the hydraulic schematic on the valve nameplate and
to the type designation defining the pilot mode.
Maximum pilot and operating pressure (p
plate.

5 Electrical Connection

Electrical safety: The protective conductor connection is con-
nected to the electronics housing or valve body. The insulation
materials employed are designed for use in the safety extra-
low voltage range. The field bus circuit connections are only
functionally galvanically isolated from the other connected cir-
cuits.
To comply with safety regulations requires isolation from the
mains according to EN 61558-1 and EN 61558-2-6 and limiting
all voltages according to EN 60204-1. We recommend using
SELV/PELV power supplies.
Rated signal: See nameplate.
External fuse per valve: 0.5 A time lag
Valve phasing: A positive signal (4–5) causes valve opening
PA.
Connector wiring: See wiring schematic tag attached to elec-
tronics housing, or refer to the catalog or the installation draw-
ing.
Connection: Signal lines shielded, shielding connected at
both ends and additionally connected to reference potential
(0 V) at the control side (to improve EMC). Connect the protec-
tive conductor.
Observe technical note TN 353.
6 Hydraulic System Start Up
Pay attention to the pressure setting, the venting instructions,
the fail-safe functions and the alarm messages!
7 Venting
WARNING
Hydraulic fluid squirting out
Hydraulic fluid squirting out under high pressure or
parts falling off can cause serious personal injuries,
burns and fires.
 Only vent the valve and the actuator at a low sys-
tem pressure of max. 10 bar (145 psi).
 Carefully open the venting screw by approx. one
revolution.
Page 2/3
Check for flatness
Socket Torque
head screw Pcs. [Nm]
M6 x 60 4
M10 x 60 4
M6 x 55 2
M12 x 75 6
, p ): See name-
X P
8 Null Adjustment
Unsafe state of the machine due to wrong posi-
tion of the valve's spool.
A wrong position of the valve's spool may result in
undefined sequences of motion.
 With valves with fail-safe function, the null position
The null adjustment of the valve and further parameterizations
can be done via the field bus.
11
9 Maintenance
54
Except for a regular visual inspection for exterior leakage and
11
filter change, no maintenance work on the valves is required.
94
Changing the filter: The installed filter protects internal ori-
fices and nozzles against coarse particle contamination. The
valve response time will increase as contamination increases.
The filters located below the filter cover at the side may be re-
placed by the customer.
Changing the filter
Cleaning serves no purpose.
Fluid flow through the filter disk (2) is from inside to
outside leaving particles behind the filter disk (2) and
cannot be seen from the outside after removing the
filter cover (4).
 Before beginning work, clean the outside of the
• Remove hexagon socket screws (5) with a wrench and
remove the filter cover (4). Remove the filter disk (2),
which is now accessible, with tweezers or a fine screw-
driver.
Fig.: Principles of construction
• Check O-rings (1) and (3) and replace if necessary.
• Install new filter disk. To do this, first insert the O-Ring
(1), then the filter disk (2) so that the side of the filter disk
with the indentation faces the outside. Insert O-ring (3) in
the filter cover (4) with some clean grease and mount.
• Cross-torque screws to:
Type
pQ-Proportional
Valve
• After start-up, check valve for external leakage.
Mounting and Installation Notes D941/2/3/4 (B97072-941-001; Version E, 07/13)
WARNING
must not be altered.
WARNING
WARNING
WARNING
valve around the filter cover!
1
2
3
4
5
Series Screw
D941 M5 x 8–10.9
Torque
[Nm] (lbf in)
8.34 (73.8)