GE D20 Installation And Operation Manual page 8

D20/D200
Installation and Operations Guide
Product Support and Safety
Do's and Follow these practices at all times:
Don'ts
1. Surge and noise suppression components used on the D20 and D200 are
designed to conduct during transients to prevent nuisance operation or damage to
internal components. To ensure shunting of transients from line to ground, the
D20's and D200's earth ground stud must be connected to a low impedance
ground using braided cable or heavy solid copper conductor (12 AWG
recommended). When making ground connections, ensure that all surfaces that
are used for grounding are free of dirt, residue and corrosion. A coating such as
glyptol can be used to protect these connections from oxidation and dirt deposits.
2. Ensure that cable shields are grounded at either the D20 or D200 auxiliary
ground stud or at the field equipment. Do not ground the shields at more than
one point because a potential difference may exist between grounds causing
ground loops and undesirable noise sources.
3. Ensure that all nuts and screws are properly tightened.
4. Always replace fuses with the same type and rating used by GE Energy. For fuse
types and ratings, see "Servicing", page 118.
5. When connecting to communications equipment such as modems or radios,
always use appropriate surge protectors to protect the communication ports.
6. To prevent interference with communications, route all communication cables
away from power-carrying cables.
7. Always fuse-protect field sources.
8. Always configure the jumpers in your D20 or D200 prior to connecting field I/O.
9. Follow all instructions in this guide as they are presented.
10. Do not operate the D20 or D200 if it has been dropped or damaged. Return it to
GE Energy for inspections and repair.
11. The D20 and D200 power supplies use switching technology. For proper
operation, the input voltage must be within specified limits prior to turning on
the D20's or D200's power switch.
12. Do not apply voltages outside the range of the product specifications. Voltages
outside the specified range may lead to premature product failure.
13. Do not modify the D20 or D200 without prior written authorization form GE
Energy.
Make sure the D20 or D200 is grounded using the protective ground stud.
Connection must be provided with separate green/yellow wire connected between
!
the D20 or D200 and the protective earth system of the facility. Minimum 12 AWG
is recommended.
Protective
Earth/Ground
6
, continued
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