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All limit switches linkages 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.
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.
On HS style transfer switch mechanisms, check nylock nuts on bolt pivot points.
Operation arms should move freely without excessive play.
7.3.
To maintain operational integrity, ensure that:
All control devices are in good condition and correctly calibrated.
All control devices are adequately secured in their plug-in fixtures.
Only qualified personnel should undertake service work. Failure to correctly maintain an
automatic transfer switch may present a hazard to life and equipment. Full operational
testing must be done prior to placing a transfer switch in service subsequent to any
maintenance or repair. Any service work involving electrical components requires high-
potential testing to ensure that required insulation levels have been maintained.
TRANSFER SWITCH MECHANISM – 125 - 800 Amp (S Style)
7.
The transfer mechanism consists primarily of the transfer gear motor, a drive hub assembly, and two
power switching device operating arms.
The reversible transfer gear motor drives the drive hub assembly, which in turn moves the power
switching device operating arms. The power switching device toggles are set inside the operating
arm slots and are moved by them. There are two limit switches, which are contacted by the
operating arms (one for each power switching device), which disconnect the transfer motor power
supply when the power switching devices have attained full travel. Should limit switch adjustment be
required, it is advisable to consult Thomson Power Systems for further information.
PM059 REV 9 14/01/16
TS 830 TRANSFER SWITCH
11
Thomson Power Systems
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