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TS 870 TRANSFER SWITCH
PM062 REV 5 08/05/05 19 Thomson Technology
9. TRANSFER SWITCH MECHANISM –1000A-1200A, T-Style
The transfer mechanism consists primarily of the transfer motor, a hub assembly, two operating
rods and two power switching device operating yokes.
The reversible transfer motor drives the hub assembly, which in turn moves the operating rods that
are connected to the power switching device operating yokes. The power switching device toggles
are set inside the yokes and are moved by them. There are two limit switches, which are contacted
by the operating yokes (one for each direction of travel), which disconnect the transfer motor power
supply when the power switching devices have attained full travel. The adjuster screws, located on
the yokes determine the operating point of these limit switches. Should adjustment be required, it is
advisable to consult Thomson Technology for further information.
The transfer switch mechanism has three possible positions:
a) Utility power switching device closed and generator power switching device open;
b) Generator power switching device closed and utility power switching device open;
d) Both utility and generator power switching devices open, but NEVER both utility and
generator power switching devices closed at the same time.
9.1. MANUAL OPERATION
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
Isolate the transfer switch from all sources of supply before opening the enclosure for
manual operation. With all sources of power de-energized to the transfer switch, the control
circuit isolation plug can be unplugged to prevent subsequent operation.
To operate manually, pull the release plunger and operate the handle in the desired
direction.
Automatic operation may be regained by replacing the isolation plug. With all sources of
power de-energized to the transfer switch, the control circuit isolation plug can be re-