TS 870 Transfer Switch
PM062 REV 11 16/04/19
33
Thomson Power Systems
7.
GENERAL NOTES ON SERVICING TRANSFER SWITCH
MECHANISMS
DANGER
Arc Flash and Shock Hazard. Will cause severe injury or death. Do not open
equipment until ALL power sources are disconnected. This equipment must be
installed and serviced only by qualified electrical personnel utilizing safe work
practices and appropriate Personal Protective Equipment (PPE). Failure to do
so may cause personal injury or death.
NOTE:
Refer to section 4.2 of this manual
for identification of Transfer Switch Mechanism styles
supplied for the Transfer Switch.
When performing any service work on the transfer mechanism, it is imperative that the following be
observed:
7.1.
To maintain mechanical integrity, ensure that:
•
On T Style mechanisms, all limit switches are correctly adjusted to provide full travel
of the power switching device toggles without exerting unnecessary forces
associated with excessive travel. Ensure that power switching device travel far
enough to reset any internal trip unit (it is more important for the toggle to go fully
in the Off direction, than in the On direction).
•
Mechanical interlocking is correct when one power switching opens well before the
other should close.
•
All fasteners are adequately tightened.
•
The operating linkages are not damaged or bent, and that all bearing points operate
freely.
•
On S Style transfer switch mechanisms, check nylock nuts on bolt pivot points.
Operation arms should move freely without excessive play.
7.2.
To maintain electrical integrity, ensure that:
•
All electrical connections, especially power connections, are clean and adequately
tightened. Corroded or loose power connections will cause destructive heating,
and may cause premature tripping.
•
All insulating devices are in place and in good condition.
•
No moisture or other contamination is present.
•
Electrical conductors are adequately secured away from moving parts.
Summary of Contents for TS 870
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