Commissioning; Normal Operation; Extraordinary And Emergency Situations - Argo-Hytos SD3EX-B2 Gebrauchsanweisung

7.3 Commissioning

Before commissioning the hydraulic ciruit, check that the valve is correctly mounted on the connection plate and that electrical supply cables are
correctly connected. The valve is not to be adjusted. Test operation should be conducted without the pressence of an explosive atmosphere.
After the hydraulic circuit has been commissioned, check the valve for leaks. Simply verify the valve, repositioning the spool by alternately switching
the solenoids and monitoring the movement of the appliance or the amount of pressure in the appliance branches.

7.4 Normal operation

During normal operation, the valve spool is adjusted by the solenoids. Normal operation of the system does not require any manipulation of the valve.
CAUTION
DO NOT EXCEED THE MAXIMUM
OBSERVE THE OPERATIONAL RESTRICTIONS AND AVOID THE
USE PROTECTIVE EQUIPMENT
When working with hydraulic fluid, it is recommended to wear safety goggles, protective rubber gloves and sturdy shoes with non-slip soles.

7.5 Extraordinary and emergency situations

In the event of a power failure to the solenoids or a coil failure, the centering spring will return the valve spool to its base position.
Based on the results of the risk analysis, the following potential faults have been identified:
› External valve leakage due to seal damage associated with a working fluid leak.
› Loss of valve function, resulting in loss of control of the appliance.
› Mechanical damage to the electrical part of the valve including the cable
DANGER
DANGER
CAUTION
CAUTION
Defective valves must be replaced/repaired.
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Coil cooling
Coil cooling takes into account the cooling surface of the hydraulic part of the valve.
Do not power separately disassembled coils. Excessive winding heat, insulation damage and short circuiting
between coils may occur. For the same reason, the surface of the coils must not be covered, exposed to direct
heat sources or sunlight. The valve must not be closed in a tight space without ensuring air circulation.
PARAMETERS, shown in table 4.4.
Shutdown of electrical power, pressure source and circuit relief
In the event of an emergency, immediately shut off the electrical power supply to the control solenoids and the
pressure source (pump). Relieve all parts of the hydraulic circuit including the hydraulic accumulators by
connecting them to the tank. A malfunctioning valve may cause a dangerous operating situation due to loss of
control. A damaged electrical part can initiate an explosion.
Prohibition of handling and repair in explosive atmospheres
A defective valve must not be repaired or dismantled when an explosive atmosphere is present.
There is a risk of initiating an explosion.
Check pressure relief part of the circuit
Always ensure that the circuit is depressurised before intervening in the hydraulic circuit, for example before
removing a valve. Otherwise there is a risk of leakage of working fluid and contamination of persons.
Surface temperature
Before starting disassembly, make sure that the surface of the valve and solenoid coils has cooled to a low
enough temperature to prevent skin burns.
RISKS, referred to in paragraph 3.
Instructions_SD3EX-C2*S5(S6)_14091_1en_01/2023
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