Sentry CR105 Manuel télécharger pdf (Page 7)

U7698E Flame Detector

Part 334614E

E 2002 Nordson Corporation

Manual 34-49

Grounding

WARNING: Operating faulty electrostatic equipment is hazardous and can

cause electrocution, fire, or explosion. Make resistance checks part of your

periodic maintenance program. If you receive even a slight electrical shock

or notice static sparking or arcing, shut down all electrical or electrostatic

equipment immediately. Do not restart the equipment until the problem has

been identified and corrected.

All work conducted inside the spray booth or within 1 m (3 ft) of booth

openings is considered within a Class 2, Division 1 or 2 Hazardous location

and must comply with NFPA 33, NFPA 70 (NEC articles 500, 502, and 516),

and NFPA 77, latest conditions.

S All electrically conductive objects in the spray areas shall be electrically

connected to ground with a resistance of not more than 1 megohm as

measured with an instrument that applies at least 500 volts to the circuit

being evaluated.

S Equipment to be grounded includes, but is not limited to, the floor of the

spray area, operator platforms, hoppers, photoeye supports, and

blow-off nozzles. Personnel working in the spray area must be

grounded.

S There is a possible ignition potential from the charged human body.

Personnel standing on a painted surface, such as an operator platform,

or wearing non-conductive shoes, are not grounded. Personnel must

wear shoes with conductive soles or use a ground strap to maintain a

connection to ground when working with or around electrostatic

equipment.

S Operators must maintain skin-to-handle contact between their hand and

the gun handle to prevent shocks while operating manual electrostatic

spray guns. If gloves must be worn, cut away the palm or fingers, wear

electrically conductive gloves, or wear a grounding strap connected to

the gun handle or other true earth ground.

S Shut off electrostatic power supplies and ground gun electrodes before

making adjustments or cleaning powder spray guns.

S Connect all disconnected equipment, ground cables, and wires after

servicing equipment.

Action in the Event of a Malfunction

If a system or any equipment in a system malfunctions, shut off the system

immediately and perform the following steps:

S Disconnect and lock out electrical power. Close pneumatic shutoff

valves and relieve pressures.

S Identify the reason for the malfunction and correct it before restarting the

equipment.

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