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S&C Instruction Sheet 1045M-510
Installing the Rotating Switch Operator
NOTICE
The switch operator is capable of generating tremendous torque. It is essential to
install the switch operator rod and linkages with couplings that will not slip under
very high torque conditions. The connections should be made with through-hole
bolts or straight couplings with piercing set screws. If using straight couplers, pay
careful attention to ensure the set screws fully pierce the metal pipe to prevent
slippage under load. Avoid overtightening the screws.
The switch operator is capable of stand-alone automatic operation, such as voltage
loss-line sectionalizing, as well as remote operation via SCADA. Before coupling or
decoupling the switch from the switch operator, or attempting any manual operation
with the mechanical operating handle, always:
• Remove the manual operating handle, supplied with the switch operator, from its
storage location on the faceplate.
• Set the REMOTE/LOCAL switch to the
Local state.
• Make sure that the AUTOMATIC OPERATION LED indicates
Disabled state.
• Open the dc circuit breaker behind the faceplate.
Do not attempt to operate the switch attached to a newly installed switch operator
until the setup software has been properly configured for the installation or before
the limits of operator travel have been set.
Putting the Switch into
Local/Non-automatic
Service
Remove any temporarily installed bypass switches, and release the switch for local, non-
automatic operation from the faceplate.
CAUTION
Be sure to leave the switch operator in the
Local state (not Remote state) and
Automatic Operation in the
Disabled state (not Enabled state) until the software in
the switch operator is configured for this installation.
This completes the rotating switch operator hardware installation. See Instruction
Sheet 1045M-530, “S&C 6801M Automatic Switch Operators:
Setup”
for instructions about
configuring the switch operator.
Adjusting the
Tap Position on the
Load Resistor
The factory-set, spiral-wound load resistor is used both as a battery-test load and a current-
limiting (torque-limiting) resistor for setting the closed-reference torque. The closed-
reference torque is the torque applied to the control rod after the close limit of travel is
set. The resistor setting also adjusts the torque applied to the control rod during low-
speed jogging of the operator.
Under most circumstances, the factory setting of the load resistor will be adequate.
However, on some switches, as the blades are jogged into their
Closed
position at low
speed, additional torque may be necessary to overcome mechanical contact resistance.
Although the setup of the switch can be performed by manually swinging the switch
blades into their
Closed
position, it is usually desirable for the load resistor to be adjusted
so this function can be performed entirely from the faceplate.
CAUTION
Remove the ac line fuse and turn the dc breaker off before adjusting the resistor tap
position. The travel limits will also have to be reset after changing the tap position.
Do not adjust the load-tap resistor to a value less than the minimum tap position
shown in Table 2 on page 25.
