Woodward 3171A, Руководство по эксплуатации продукта, Страница: 15 / 47

Manual 26731 EM35MR1/3171A Gas Valve
Woodward 5
EXPLOSION HAZARD—Do not connect or disconnect while circuit is
live unless area is known to be non-hazardous.
Substitution of components may impair suitability for Class I,
Division or Zone applications.
RISQUE D’EXPLOSION—Ne pas raccorder ni débrancher
tant que l’installation est sous tension, sauf en cas
l’ambiance est décidément non dangereuse.
La substitution de composants peut rendre ce matériel
inacceptable pour les emplacements de Classe I, applications
Division ou Zone.
Take care not to damage the cover seal, the cover surface, the
threads, or the actuator or resolver surface while removing or
replacing the cover.
The EM35MR1 Actuator and EM Resolvers are certified as type ‘d’
(flameproof enclosure) ATEX Category 2 equipment, suitable for use in
a Zone 1 explosive atmosphere. Wiring methods must comply with
this Zone 1-Category 2 method of protection when installed in either a
Zone 1 or a Zone 2 classified atmosphere. Conduit seals are required.
Refer to the Special Conditions for Safe Use stated on page v.
EXPLOSION HAZARD—For Zone 1 / Division 1 products: Proper
torque is very important to ensure that the unit is sealed properly.
Actuator cover bolt torque is:
0.250-28 socket head cap screw = 9.2 N

m (81 lb-in)
M6 x 1 socket head cap screw = 8.0 N

m (71 lb-in)
Resolver cover bolt torque is 9.2 N

m (81 lb-in).
Plant Wiring
Due to the hazardous location listings associated with this product,
proper wire type and wiring practices are critical to operation.
Do not connect any cable grounds to “instrument ground”, “control
ground”, or any non-earth ground system. Make all required
electrical connections based on the wiring diagram (Figure 2-5).
Figure 2-5 is the plant wiring diagrams for the EM driver, EM35MR1
actuator/3171A gas valve when conduit is used for all wire runs.
Consult the EM Driver manual (26159) for specific wiring requirements and procedures.
1. Do not leave extra power wiring between the motor and the driver: Any extra
motor wire in the installation should be cut off and discarded, not coiled.
Coiled wire will cause an inductance which could be greater than that
of the motor.