Parker TDP Series Operation Manual page 16

Operation Manual
Failure to tighten the screw connectors may
cause the connectors to loosen and may
impair the seal.
If you are using plugs from other manufactur-
ers, follow the relevant instructions.
Short circuits between the wires, poor
workmanship or incorrect attachment of
the shielding may cause disruption and the
failure of the valve and the electronic control
system.
Sensor Connection
See "Technical data" page 18
Choice of Solenoid
The choice of a suitable solenoid is an important
factor in the operational reliability of the valve. The
D3DW is available with various solenoid voltages.
If the solenoid can be adjusted by setting param-
eters in the electronic control system, the suitable
solenoid options must be selected.
Note about using valves with actuating so-
lenoids:
The current drops as the solenoid heats up.
The lower current has no effect on valve
operation, provided the specified voltage is
maintained at the valve.
A suitable tool must if necessary be used for
manual emergency actuation of the solenoid.
Remaining Risk
Allergic Reactions
Hydraulic oil can cause allergic reactions on sus-
ceptible skin. This can be prevented by taking the
precautions that are usual when handling mineral
oil products and by using personal protective
equipment.
Leaking Plugs
Leaking plugs can cause a malfunction. That
is why the plugs must be checked for leaks
at the regular maintenance interval. Leaking
plugs may constitute a safety hazard, so the
valve must be returned to the manufacturer
TDP_TEP 5715-697UK.indd 05.11.20
2-Way Servo Proportional Valves
Series TDP/TEP
for repair.
Lightning
If electronic components are exposed to
electromagnetic fields as a result of lightning,
they must be checked to ensure they are still
working perfectly. If there is a malfunction, the
product must be returned to the manufacturer.
Temperature
The surface of our product may heat up in use.
The service temperatures may exceed the
temperature threshold for burn injury, 70 °C.
Above this threshold, even brief contact with
the surface may result in a burn.
The only way to consistently prevent burn
injuries is to use personal protective equip-
ment and to remain safety-conscious at all
times.
If integrated electronics are exposed to a
temperature above 80 °C, they may malfunc-
tion.
Power Failure
In a power failure the valve piston returns to
the spring centred starting position.
You must check whether this creates potential
hazards when the system/machine is used.
Hydraulic
The D3DW is tested and approved with an even
flow. If the flow becomes asymmetrical, the safety
function of the valve may be compromised. You
should therefore carry out tests before commission-
ing to verify that the valve is in good working order.
If the valve piston has been under pressure and
stationary in the end position for an extended pe-
riod, oil particles may cause the piston to seize. For
this reason the valve should be actuated regularly.
Electrical Connection for Position Control
The position control can be connected as normally
closed or normally open. In principle, we recom-
mend a normally closed connection, as this is the
only way to ensure that position control works
properly
16 Parker Hannifin Corporation