23
M A I N T EN A N C E
—
Maintenance
General
Inspect all switchgear installations at frequent
intervals. Perform a visual inspection, front and
rear, to see that there is no evidence of loose
parts, warping or undue vibration. Check
instrumentation for undue noise. Take steps to
remedy any deficiencies of this nature that may
appear. Keep the assembly dry. Cover to prevent
moisture from dripping on equipment. Do not
block vents or flaps.
Danger: Turn off power ahead of switchgear before
performing any inspection or maintenance
operations.
Check incoming line terminals to verify that the
equipment is de-energized and grounded.
Check outgoing terminals to ensure that no back-
feed conditi
on exists.
Annual inspection
Perform the following recommended inspection
and maintenance once a year, or sooner, if required
by local conditions or regulations.
1. Perform an overall visual inspection.
2. Check all indicators, meters and instruments
for proper operation.
3. Make sure all bolted connections are secure.
All bolted joints must be torqued per the values
in appendix A — target torque values. Bolted
connections should be tight. Discoloration,
excessive corrosion, embrittlement or
discolored insulation may indicate an
overheated connection. If found, follow the
procedure described under section 9.5 —
bolted joint maintenance.
4. Verify operation of heaters and thermostats,
if used.
5. Check for undue noise and vibration that might
loosen bolted connections.
6. Look for evidence of moisture in the switchgear.
Evidence of moisture can be but not limited to
water droplets, condensation, oxidized metal,
etc.
7. Inspect all cables for tight connections and
ample support.
8. Inspect control wiring for signs of wear and
damage, especially at door hinge locations.
Replace wire wherever doubtful.
9. Examine resistors and other devices prone
to overheating.
10. Open all hinged doors and inspect hinges
and latches.
11. Clean insulation thoroughly.
Caution:
Do not use alcohol or Freon.
Limit the use of solvents to removing
grease and contamination from
primary conductors, insulation and
unpainted metallic surfaces.
Use an OSHA-approved, non-
flammable solvent with a threshold
limit of 300 PPM or higher in
accordance with local regulations.
Use solvents in well-ventilated areas.
12. Withdraw and clean all drawout components.
Refer to circuit breaker installation, operation
and maintenance manual 1VAL057601-MB
before cleaning contacts.
13. Clean the stationary portion of the switchgear
by wiping with a clean cloth. Use dry,
compressed air in inaccessible areas.
14. Remove the covers of all panel devices where
possible. Check wiring for secure connections.
Clean contacts on relays and switches wherever
necessary. Replace covers.
15. Remove air filters when used. Flush with clean
water if necessary. Coat filters with Randolf
Products Super Coat Adhesive or equivalent.
16. Inspect the chains/sprocket (figure 31) and the
lifting rail of lift truck, if used for normal
operation. For normal operation, use a heavy
gear lubricant. In very dirty or gritty conditions,
use a dry lubricant.
Содержание ReliaGear ND
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